diff --git a/backend/controller/scaling/localscaling/local_scaling.go b/backend/controller/scaling/localscaling/local_scaling.go
index 9867bb472b..799d4f1fdd 100644
--- a/backend/controller/scaling/localscaling/local_scaling.go
+++ b/backend/controller/scaling/localscaling/local_scaling.go
@@ -42,9 +42,31 @@ type localScaling struct {
 	prevRunnerSuffix int
 	ideSupport       optional.Option[localdebug.IDEIntegration]
 	registryConfig   artefacts.RegistryConfig
+
+	devModeEndpointsUpdates <-chan scaling.DevModeEndpoints
+	devModeEndpoints        map[string]*devModeRunner
+}
+
+type devModeRunner struct {
+	uri           url.URL
+	deploymentKey string
 }
 
 func (l *localScaling) Start(ctx context.Context, endpoint url.URL, leaser leases.Leaser) error {
+	go func() {
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case devEndpoints := <-l.devModeEndpointsUpdates:
+				l.lock.Lock()
+				l.devModeEndpoints[devEndpoints.Module] = &devModeRunner{
+					uri: devEndpoints.Endpoint,
+				}
+				l.lock.Unlock()
+			}
+		}
+	}()
 	scaling.BeginGrpcScaling(ctx, endpoint, leaser, l.handleSchemaChange)
 	return nil
 }
@@ -82,21 +104,22 @@ type runnerInfo struct {
 	port       string
 }
 
-func NewLocalScaling(portAllocator *bind.BindAllocator, controllerAddresses []*url.URL, configPath string, enableIDEIntegration bool, registryConfig artefacts.RegistryConfig) (scaling.RunnerScaling, error) {
-
+func NewLocalScaling(portAllocator *bind.BindAllocator, controllerAddresses []*url.URL, configPath string, enableIDEIntegration bool, registryConfig artefacts.RegistryConfig, devModeEndpoints <-chan scaling.DevModeEndpoints) (scaling.RunnerScaling, error) {
 	cacheDir, err := os.UserCacheDir()
 	if err != nil {
 		return nil, err
 	}
 	local := localScaling{
-		lock:                sync.Mutex{},
-		cacheDir:            cacheDir,
-		runners:             map[string]map[string]*deploymentInfo{},
-		portAllocator:       portAllocator,
-		controllerAddresses: controllerAddresses,
-		prevRunnerSuffix:    -1,
-		debugPorts:          map[string]*localdebug.DebugInfo{},
-		registryConfig:      registryConfig,
+		lock:                    sync.Mutex{},
+		cacheDir:                cacheDir,
+		runners:                 map[string]map[string]*deploymentInfo{},
+		portAllocator:           portAllocator,
+		controllerAddresses:     controllerAddresses,
+		prevRunnerSuffix:        -1,
+		debugPorts:              map[string]*localdebug.DebugInfo{},
+		registryConfig:          registryConfig,
+		devModeEndpointsUpdates: devModeEndpoints,
+		devModeEndpoints:        map[string]*devModeRunner{},
 	}
 	if enableIDEIntegration && configPath != "" {
 		local.ideSupport = optional.Ptr(localdebug.NewIDEIntegration(configPath))
@@ -168,6 +191,17 @@ func (l *localScaling) startRunner(ctx context.Context, deploymentKey string, in
 		return nil
 	default:
 	}
+
+	devEndpoint := l.devModeEndpoints[info.module]
+	devURI := optional.None[url.URL]()
+	if devEndpoint != nil {
+		devURI = optional.Some(devEndpoint.uri)
+		if devEndpoint.deploymentKey == deploymentKey {
+			// Already running, don't start another
+			return nil
+		}
+		devEndpoint.deploymentKey = deploymentKey
+	}
 	controllerEndpoint := l.controllerAddresses[len(l.runners)%len(l.controllerAddresses)]
 	logger := log.FromContext(ctx)
 
@@ -201,6 +235,7 @@ func (l *localScaling) startRunner(ctx context.Context, deploymentKey string, in
 		Deployment:         deploymentKey,
 		DebugPort:          debugPort,
 		Registry:           l.registryConfig,
+		DevEndpoint:        devURI,
 	}
 
 	simpleName := fmt.Sprintf("runner%d", keySuffix)
@@ -223,10 +258,12 @@ func (l *localScaling) startRunner(ctx context.Context, deploymentKey string, in
 		err := runner.Start(runnerCtx, config)
 		l.lock.Lock()
 		defer l.lock.Unlock()
+		if devEndpoint != nil {
+			devEndpoint.deploymentKey = ""
+		}
+		// Don't count context.Canceled as an a restart error
 		if err != nil && !errors.Is(err, context.Canceled) {
 			logger.Errorf(err, "Runner failed: %s", err)
-		} else {
-			// Don't count context.Canceled as an a restart error
 			info.exits++
 		}
 		if info.exits >= maxExits {
diff --git a/backend/controller/scaling/scaling.go b/backend/controller/scaling/scaling.go
index e926a26850..08a4079dc2 100644
--- a/backend/controller/scaling/scaling.go
+++ b/backend/controller/scaling/scaling.go
@@ -65,3 +65,8 @@ func runGrpcScaling(ctx context.Context, url url.URL, handler func(ctx context.C
 	rpc.RetryStreamingServerStream(ctx, "local-scaling", backoff.Backoff{Max: time.Second}, &ftlv1.PullSchemaRequest{}, client.PullSchema, handler, rpc.AlwaysRetry())
 	logger.Debugf("Stopped Runner Scaling")
 }
+
+type DevModeEndpoints struct {
+	Module   string
+	Endpoint url.URL
+}
diff --git a/backend/protos/xyz/block/ftl/v1/language/language.pb.go b/backend/protos/xyz/block/ftl/v1/language/language.pb.go
index 01e1ae5101..a1ed42bbda 100644
--- a/backend/protos/xyz/block/ftl/v1/language/language.pb.go
+++ b/backend/protos/xyz/block/ftl/v1/language/language.pb.go
@@ -137,15 +137,17 @@ type ModuleConfig struct {
 	DeployDir string `protobuf:"bytes,4,opt,name=deploy_dir,json=deployDir,proto3" json:"deploy_dir,omitempty"`
 	// Build is the command to build the module.
 	Build *string `protobuf:"bytes,5,opt,name=build,proto3,oneof" json:"build,omitempty"`
+	// DevModeBuild is the command to build the module in dev mode.
+	DevModeBuild *string `protobuf:"bytes,6,opt,name=devModeBuild,proto3,oneof" json:"devModeBuild,omitempty"`
 	// Build lock path to prevent concurrent builds
-	BuildLock string `protobuf:"bytes,6,opt,name=build_lock,json=buildLock,proto3" json:"build_lock,omitempty"`
+	BuildLock string `protobuf:"bytes,7,opt,name=build_lock,json=buildLock,proto3" json:"build_lock,omitempty"`
 	// The directory to generate protobuf schema files into. These can be picked up by language specific build tools
-	GeneratedSchemaDir *string `protobuf:"bytes,7,opt,name=generated_schema_dir,json=generatedSchemaDir,proto3,oneof" json:"generated_schema_dir,omitempty"`
+	GeneratedSchemaDir *string `protobuf:"bytes,8,opt,name=generated_schema_dir,json=generatedSchemaDir,proto3,oneof" json:"generated_schema_dir,omitempty"`
 	// Patterns to watch for file changes
-	Watch []string `protobuf:"bytes,8,rep,name=watch,proto3" json:"watch,omitempty"`
+	Watch []string `protobuf:"bytes,9,rep,name=watch,proto3" json:"watch,omitempty"`
 	// LanguageConfig contains any metadata specific to a specific language.
 	// These are stored in the ftl.toml file under the same key as the language (eg: "go", "java")
-	LanguageConfig *structpb.Struct `protobuf:"bytes,9,opt,name=language_config,json=languageConfig,proto3" json:"language_config,omitempty"`
+	LanguageConfig *structpb.Struct `protobuf:"bytes,10,opt,name=language_config,json=languageConfig,proto3" json:"language_config,omitempty"`
 }
 
 func (x *ModuleConfig) Reset() {
@@ -213,6 +215,13 @@ func (x *ModuleConfig) GetBuild() string {
 	return ""
 }
 
+func (x *ModuleConfig) GetDevModeBuild() string {
+	if x != nil && x.DevModeBuild != nil {
+		return *x.DevModeBuild
+	}
+	return ""
+}
+
 func (x *ModuleConfig) GetBuildLock() string {
 	if x != nil {
 		return x.BuildLock
@@ -573,15 +582,17 @@ type ModuleConfigDefaultsResponse struct {
 	DeployDir string `protobuf:"bytes,1,opt,name=deploy_dir,json=deployDir,proto3" json:"deploy_dir,omitempty"`
 	// Default build command
 	Build *string `protobuf:"bytes,2,opt,name=build,proto3,oneof" json:"build,omitempty"`
+	// Dev mode build command, if different from the regular build command
+	DevModeBuild *string `protobuf:"bytes,3,opt,name=devModeBuild,proto3,oneof" json:"devModeBuild,omitempty"`
 	// Build lock path to prevent concurrent builds
-	BuildLock *string `protobuf:"bytes,3,opt,name=build_lock,json=buildLock,proto3,oneof" json:"build_lock,omitempty"`
+	BuildLock *string `protobuf:"bytes,4,opt,name=build_lock,json=buildLock,proto3,oneof" json:"build_lock,omitempty"`
 	// Default relative path to the directory containing generated schema files
-	GeneratedSchemaDir *string `protobuf:"bytes,4,opt,name=generated_schema_dir,json=generatedSchemaDir,proto3,oneof" json:"generated_schema_dir,omitempty"`
+	GeneratedSchemaDir *string `protobuf:"bytes,5,opt,name=generated_schema_dir,json=generatedSchemaDir,proto3,oneof" json:"generated_schema_dir,omitempty"`
 	// Default patterns to watch for file changes, relative to the module directory
-	Watch []string `protobuf:"bytes,5,rep,name=watch,proto3" json:"watch,omitempty"`
+	Watch []string `protobuf:"bytes,6,rep,name=watch,proto3" json:"watch,omitempty"`
 	// Default language specific configuration.
 	// These defaults are filled in by looking at each root key only. If the key is not present, the default is used.
-	LanguageConfig *structpb.Struct `protobuf:"bytes,6,opt,name=language_config,json=languageConfig,proto3" json:"language_config,omitempty"`
+	LanguageConfig *structpb.Struct `protobuf:"bytes,7,opt,name=language_config,json=languageConfig,proto3" json:"language_config,omitempty"`
 }
 
 func (x *ModuleConfigDefaultsResponse) Reset() {
@@ -628,6 +639,13 @@ func (x *ModuleConfigDefaultsResponse) GetBuild() string {
 	return ""
 }
 
+func (x *ModuleConfigDefaultsResponse) GetDevModeBuild() string {
+	if x != nil && x.DevModeBuild != nil {
+		return *x.DevModeBuild
+	}
+	return ""
+}
+
 func (x *ModuleConfigDefaultsResponse) GetBuildLock() string {
 	if x != nil && x.BuildLock != nil {
 		return *x.BuildLock
@@ -1237,10 +1255,15 @@ type BuildSuccess struct {
 	Module *schema.Module `protobuf:"bytes,3,opt,name=module,proto3" json:"module,omitempty"`
 	// Paths for files/directories to be deployed
 	Deploy []string `protobuf:"bytes,4,rep,name=deploy,proto3" json:"deploy,omitempty"`
+	// Name of the docker image to use for the runner
+	DockerImage string `protobuf:"bytes,5,opt,name=docker_image,json=dockerImage,proto3" json:"docker_image,omitempty"`
 	// Errors contains any errors that occurred during the build
 	// No errors can have a level of ERROR, instead a BuildFailure should be sent
 	// Instead this is useful for INFO and WARN level errors.
-	Errors *ErrorList `protobuf:"bytes,5,opt,name=errors,proto3" json:"errors,omitempty"`
+	Errors *ErrorList `protobuf:"bytes,6,opt,name=errors,proto3" json:"errors,omitempty"`
+	// Dev mode endpoint URI. If this is set then rather than trying to deploy the module, FTL will start a runner that
+	// connects to this endpoint.
+	DevEndpoint *string `protobuf:"bytes,7,opt,name=dev_endpoint,json=devEndpoint,proto3,oneof" json:"dev_endpoint,omitempty"`
 }
 
 func (x *BuildSuccess) Reset() {
@@ -1301,6 +1324,13 @@ func (x *BuildSuccess) GetDeploy() []string {
 	return nil
 }
 
+func (x *BuildSuccess) GetDockerImage() string {
+	if x != nil {
+		return x.DockerImage
+	}
+	return ""
+}
+
 func (x *BuildSuccess) GetErrors() *ErrorList {
 	if x != nil {
 		return x.Errors
@@ -1308,6 +1338,13 @@ func (x *BuildSuccess) GetErrors() *ErrorList {
 	return nil
 }
 
+func (x *BuildSuccess) GetDevEndpoint() string {
+	if x != nil && x.DevEndpoint != nil {
+		return *x.DevEndpoint
+	}
+	return ""
+}
+
 // BuildFailure should be sent when a build fails.
 //
 // FTL may ignore this event if it does not match FTL's current build context and state.
@@ -1789,7 +1826,7 @@ var file_xyz_block_ftl_v1_language_language_proto_rawDesc = []byte{
 	0x74, 0x6c, 0x2f, 0x76, 0x31, 0x2f, 0x66, 0x74, 0x6c, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a,
 	0x24, 0x78, 0x79, 0x7a, 0x2f, 0x62, 0x6c, 0x6f, 0x63, 0x6b, 0x2f, 0x66, 0x74, 0x6c, 0x2f, 0x76,
 	0x31, 0x2f, 0x73, 0x63, 0x68, 0x65, 0x6d, 0x61, 0x2f, 0x73, 0x63, 0x68, 0x65, 0x6d, 0x61, 0x2e,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xdb, 0x02, 0x0a, 0x0c, 0x4d, 0x6f, 0x64, 0x75, 0x6c, 0x65,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x95, 0x03, 0x0a, 0x0c, 0x4d, 0x6f, 0x64, 0x75, 0x6c, 0x65,
 	0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01,
 	0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x10, 0x0a, 0x03, 0x64, 0x69,
 	0x72, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x64, 0x69, 0x72, 0x12, 0x1a, 0x0a, 0x08,
@@ -1798,183 +1835,196 @@ var file_xyz_block_ftl_v1_language_language_proto_rawDesc = []byte{
 	0x6f, 0x79, 0x5f, 0x64, 0x69, 0x72, 0x18, 0x04, 0x20, 0x01, 0x28, 0x09, 0x52, 0x09, 0x64, 0x65,
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@@ -2221,6 +2271,7 @@ func file_xyz_block_ftl_v1_language_language_proto_init() {
 	file_xyz_block_ftl_v1_language_language_proto_msgTypes[0].OneofWrappers = []any{}
 	file_xyz_block_ftl_v1_language_language_proto_msgTypes[7].OneofWrappers = []any{}
 	file_xyz_block_ftl_v1_language_language_proto_msgTypes[13].OneofWrappers = []any{}
+	file_xyz_block_ftl_v1_language_language_proto_msgTypes[18].OneofWrappers = []any{}
 	file_xyz_block_ftl_v1_language_language_proto_msgTypes[20].OneofWrappers = []any{
 		(*BuildEvent_AutoRebuildStarted)(nil),
 		(*BuildEvent_BuildSuccess)(nil),
diff --git a/backend/protos/xyz/block/ftl/v1/language/language.proto b/backend/protos/xyz/block/ftl/v1/language/language.proto
index 198035fdc8..d44124401c 100644
--- a/backend/protos/xyz/block/ftl/v1/language/language.proto
+++ b/backend/protos/xyz/block/ftl/v1/language/language.proto
@@ -22,16 +22,18 @@ message ModuleConfig {
   string deploy_dir = 4;
   // Build is the command to build the module.
   optional string build = 5;
+  // DevModeBuild is the command to build the module in dev mode.
+  optional string devModeBuild = 6;
   // Build lock path to prevent concurrent builds
-  string build_lock = 6;
+  string build_lock = 7;
   // The directory to generate protobuf schema files into. These can be picked up by language specific build tools
-  optional string generated_schema_dir = 7;
+  optional string generated_schema_dir = 8;
   // Patterns to watch for file changes
-  repeated string watch = 8;
+  repeated string watch = 9;
 
   // LanguageConfig contains any metadata specific to a specific language.
   // These are stored in the ftl.toml file under the same key as the language (eg: "go", "java")
-  google.protobuf.Struct language_config = 9;
+  google.protobuf.Struct language_config = 10;
 }
 
 // ProjectConfig contains the configuration for a project, found in the ftl-project.toml file.
@@ -94,18 +96,21 @@ message ModuleConfigDefaultsResponse {
   // Default build command
   optional string build = 2;
 
+  // Dev mode build command, if different from the regular build command
+  optional string devModeBuild = 3;
+
   // Build lock path to prevent concurrent builds
-  optional string build_lock = 3;
+  optional string build_lock = 4;
 
   // Default relative path to the directory containing generated schema files
-  optional string generated_schema_dir = 4;
+  optional string generated_schema_dir = 5;
 
   // Default patterns to watch for file changes, relative to the module directory
-  repeated string watch = 5;
+  repeated string watch = 6;
 
   // Default language specific configuration.
   // These defaults are filled in by looking at each root key only. If the key is not present, the default is used.
-  google.protobuf.Struct language_config = 6;
+  google.protobuf.Struct language_config = 7;
 }
 
 message DependenciesRequest {
@@ -208,11 +213,17 @@ message BuildSuccess {
   schema.Module module = 3;
   // Paths for files/directories to be deployed
   repeated string deploy = 4;
+  // Name of the docker image to use for the runner
+  string docker_image = 5;
 
   // Errors contains any errors that occurred during the build
   // No errors can have a level of ERROR, instead a BuildFailure should be sent
   // Instead this is useful for INFO and WARN level errors.
-  ErrorList errors = 5;
+  ErrorList errors = 6;
+
+  // Dev mode endpoint URI. If this is set then rather than trying to deploy the module, FTL will start a runner that
+  // connects to this endpoint.
+  optional string dev_endpoint = 7;
 }
 
 // BuildFailure should be sent when a build fails.
diff --git a/backend/protos/xyz/block/ftl/v1/language/mixins.go b/backend/protos/xyz/block/ftl/v1/language/mixins.go
index e7462f488b..ed43129227 100644
--- a/backend/protos/xyz/block/ftl/v1/language/mixins.go
+++ b/backend/protos/xyz/block/ftl/v1/language/mixins.go
@@ -4,7 +4,7 @@ import (
 	"fmt"
 
 	"github.com/alecthomas/types/optional"
-	structpb "google.golang.org/protobuf/types/known/structpb"
+	"google.golang.org/protobuf/types/known/structpb"
 
 	"github.com/TBD54566975/ftl/internal/builderrors"
 	"github.com/TBD54566975/ftl/internal/moduleconfig"
@@ -100,6 +100,9 @@ func ModuleConfigToProto(config moduleconfig.AbsModuleConfig) (*ModuleConfig, er
 	if config.Build != "" {
 		proto.Build = &config.Build
 	}
+	if config.DevModeBuild != "" {
+		proto.DevModeBuild = &config.DevModeBuild
+	}
 	if config.GeneratedSchemaDir != "" {
 		proto.GeneratedSchemaDir = &config.GeneratedSchemaDir
 	}
@@ -122,6 +125,7 @@ func ModuleConfigFromProto(proto *ModuleConfig) moduleconfig.AbsModuleConfig {
 		Watch:              proto.Watch,
 		Language:           proto.Language,
 		Build:              proto.GetBuild(),
+		DevModeBuild:       proto.GetDevModeBuild(),
 		BuildLock:          proto.BuildLock,
 		GeneratedSchemaDir: proto.GetGeneratedSchemaDir(),
 	}
diff --git a/backend/runner/runner.go b/backend/runner/runner.go
index ba081bc5cd..950bdff59a 100644
--- a/backend/runner/runner.go
+++ b/backend/runner/runner.go
@@ -33,6 +33,7 @@ import (
 	"github.com/TBD54566975/ftl/backend/runner/observability"
 	"github.com/TBD54566975/ftl/common/plugin"
 	"github.com/TBD54566975/ftl/internal/download"
+	"github.com/TBD54566975/ftl/internal/exec"
 	"github.com/TBD54566975/ftl/internal/identity"
 	"github.com/TBD54566975/ftl/internal/log"
 	"github.com/TBD54566975/ftl/internal/model"
@@ -57,6 +58,7 @@ type Config struct {
 	Deployment            string                   `help:"The deployment this runner is for." env:"FTL_DEPLOYMENT"`
 	DebugPort             int                      `help:"The port to use for debugging." env:"FTL_DEBUG_PORT"`
 	Registry              artefacts.RegistryConfig `embed:"" prefix:"oci-"`
+	DevEndpoint           optional.Option[url.URL] `help:"An existing endpoint to connect to in development mode" env:"FTL_DEV_ENDPOINT"`
 }
 
 func Start(ctx context.Context, config Config) error {
@@ -119,6 +121,7 @@ func Start(ctx context.Context, config Config) error {
 		labels:             labels,
 		deploymentLogQueue: make(chan log.Entry, 10000),
 		cancelFunc:         doneFunc,
+		devEndpoint:        config.DevEndpoint,
 	}
 	err = svc.deploy(ctx)
 	if err != nil {
@@ -236,10 +239,12 @@ func manageDeploymentDirectory(logger *log.Logger, config Config) error {
 var _ ftlv1connect.VerbServiceHandler = (*Service)(nil)
 
 type deployment struct {
-	key    model.DeploymentKey
-	plugin *plugin.Plugin[ftlv1connect.VerbServiceClient]
+	key model.DeploymentKey
 	// Cancelled when plugin terminates
-	ctx context.Context
+	ctx      context.Context
+	cmd      optional.Option[exec.Cmd]
+	endpoint *url.URL // The endpoint the plugin is listening on.
+	client   ftlv1connect.VerbServiceClient
 }
 
 type Service struct {
@@ -256,6 +261,7 @@ type Service struct {
 	labels              *structpb.Struct
 	deploymentLogQueue  chan log.Entry
 	cancelFunc          func()
+	devEndpoint         optional.Option[url.URL]
 }
 
 func (s *Service) Call(ctx context.Context, req *connect.Request[ftlv1.CallRequest]) (*connect.Response[ftlv1.CallResponse], error) {
@@ -263,7 +269,7 @@ func (s *Service) Call(ctx context.Context, req *connect.Request[ftlv1.CallReque
 	if !ok {
 		return nil, connect.NewError(connect.CodeUnavailable, errors.New("no deployment"))
 	}
-	response, err := deployment.plugin.Client.Call(ctx, req)
+	response, err := deployment.client.Call(ctx, req)
 	if err != nil {
 		deploymentLogger := s.getDeploymentLogger(ctx, deployment.key)
 		deploymentLogger.Errorf(err, "Call to deployments %s failed to perform gRPC call", deployment.key)
@@ -333,37 +339,50 @@ func (s *Service) deploy(ctx context.Context) error {
 			return fmt.Errorf("failed to create deployment directory: %w", err)
 		}
 	}
-	err = download.ArtefactsFromOCI(ctx, s.controllerClient, key, deploymentDir, artefacts.NewOCIRegistryStorage(s.config.Registry))
-	if err != nil {
-		observability.Deployment.Failure(ctx, optional.Some(key.String()))
-		return fmt.Errorf("failed to download artefacts: %w", err)
-	}
-
-	envVars := []string{"FTL_ENDPOINT=" + s.config.ControllerEndpoint.String(),
-		"FTL_CONFIG=" + strings.Join(s.config.Config, ","),
-		"FTL_OBSERVABILITY_ENDPOINT=" + s.config.ControllerEndpoint.String()}
-	if s.config.DebugPort > 0 {
-		envVars = append(envVars, fmt.Sprintf("FTL_DEBUG_PORT=%d", s.config.DebugPort))
-	}
-
-	verbCtx := log.ContextWithLogger(ctx, deploymentLogger.Attrs(map[string]string{"module": module.Name}))
-	deployment, cmdCtx, err := plugin.Spawn(
-		unstoppable.Context(verbCtx),
-		log.FromContext(ctx).GetLevel(),
-		gdResp.Msg.Schema.Name,
-		deploymentDir,
-		"./launch",
-		ftlv1connect.NewVerbServiceClient,
-		plugin.WithEnvars(
-			envVars...,
-		),
-	)
-	if err != nil {
-		observability.Deployment.Failure(ctx, optional.Some(key.String()))
-		return fmt.Errorf("failed to spawn plugin: %w", err)
+	var dep *deployment
+	if ep, ok := s.devEndpoint.Get(); ok {
+		client := rpc.Dial(ftlv1connect.NewVerbServiceClient, ep.String(), log.Error)
+		dep = &deployment{
+			ctx:      ctx,
+			key:      key,
+			cmd:      optional.None[exec.Cmd](),
+			endpoint: &ep,
+			client:   client,
+		}
+	} else {
+
+		err = download.ArtefactsFromOCI(ctx, s.controllerClient, key, deploymentDir, artefacts.NewOCIRegistryStorage(s.config.Registry))
+		if err != nil {
+			observability.Deployment.Failure(ctx, optional.Some(key.String()))
+			return fmt.Errorf("failed to download artefacts: %w", err)
+		}
+
+		envVars := []string{"FTL_ENDPOINT=" + s.config.ControllerEndpoint.String(),
+			"FTL_CONFIG=" + strings.Join(s.config.Config, ","),
+			"FTL_OBSERVABILITY_ENDPOINT=" + s.config.ControllerEndpoint.String()}
+		if s.config.DebugPort > 0 {
+			envVars = append(envVars, fmt.Sprintf("FTL_DEBUG_PORT=%d", s.config.DebugPort))
+		}
+
+		verbCtx := log.ContextWithLogger(ctx, deploymentLogger.Attrs(map[string]string{"module": module.Name}))
+		deployment, cmdCtx, err := plugin.Spawn(
+			unstoppable.Context(verbCtx),
+			log.FromContext(ctx).GetLevel(),
+			gdResp.Msg.Schema.Name,
+			deploymentDir,
+			"./launch",
+			ftlv1connect.NewVerbServiceClient,
+			plugin.WithEnvars(
+				envVars...,
+			),
+		)
+		if err != nil {
+			observability.Deployment.Failure(ctx, optional.Some(key.String()))
+			return fmt.Errorf("failed to spawn plugin: %w", err)
+		}
+		dep = s.makeDeployment(cmdCtx, key, deployment)
 	}
 
-	dep := s.makeDeployment(cmdCtx, key, deployment)
 	s.readyTime.Store(time.Now().Add(time.Second * 2)) // Istio is a bit flakey, add a small delay for readiness
 	s.deployment.Store(optional.Some(dep))
 	logger.Debugf("Deployed %s", key)
@@ -385,20 +404,22 @@ func (s *Service) Close() error {
 	if !ok {
 		return connect.NewError(connect.CodeNotFound, errors.New("no deployment"))
 	}
-	// Soft kill.
-	err := depl.plugin.Cmd.Kill(syscall.SIGTERM)
-	if err != nil {
-		return fmt.Errorf("failed to kill plugin: %w", err)
-	}
-	// Hard kill after 10 seconds.
-	select {
-	case <-depl.ctx.Done():
-	case <-time.After(10 * time.Second):
-		err := depl.plugin.Cmd.Kill(syscall.SIGKILL)
+	if cmd, ok := depl.cmd.Get(); ok {
+		// Soft kill.
+		err := cmd.Kill(syscall.SIGTERM)
 		if err != nil {
-			// Should we os.Exit(1) here?
 			return fmt.Errorf("failed to kill plugin: %w", err)
 		}
+		// Hard kill after 10 seconds.
+		select {
+		case <-depl.ctx.Done():
+		case <-time.After(10 * time.Second):
+			err := cmd.Kill(syscall.SIGKILL)
+			if err != nil {
+				// Should we os.Exit(1) here?
+				return fmt.Errorf("failed to kill plugin: %w", err)
+			}
+		}
 	}
 	s.deployment.Store(optional.None[*deployment]())
 	return nil
@@ -411,16 +432,18 @@ func (s *Service) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "no deployment", http.StatusNotFound)
 		return
 	}
-	proxy := httputil.NewSingleHostReverseProxy(deployment.plugin.Endpoint)
+	proxy := httputil.NewSingleHostReverseProxy(deployment.endpoint)
 	proxy.ServeHTTP(w, r)
 
 }
 
 func (s *Service) makeDeployment(ctx context.Context, key model.DeploymentKey, plugin *plugin.Plugin[ftlv1connect.VerbServiceClient]) *deployment {
 	return &deployment{
-		ctx:    ctx,
-		key:    key,
-		plugin: plugin,
+		ctx:      ctx,
+		key:      key,
+		cmd:      optional.Ptr(plugin.Cmd),
+		endpoint: plugin.Endpoint,
+		client:   plugin.Client,
 	}
 }
 
diff --git a/common/plugin/serve.go b/common/plugin/serve.go
index 70cefa6422..87b0ae9928 100644
--- a/common/plugin/serve.go
+++ b/common/plugin/serve.go
@@ -169,8 +169,9 @@ func Start[Impl any, Iface any, Config any](
 	kctx.Exit(0)
 }
 
-func allocatePort() (*net.TCPAddr, error) {
+func AllocatePort() (*net.TCPAddr, error) {
 	l, err := net.ListenTCP("tcp", &net.TCPAddr{IP: net.IPv4(127, 0, 0, 1)})
+
 	if err != nil {
 		return nil, fmt.Errorf("failed to allocate port: %w", err)
 	}
diff --git a/common/plugin/spawn.go b/common/plugin/spawn.go
index 4b79ebb1f2..ab4f45b15b 100644
--- a/common/plugin/spawn.go
+++ b/common/plugin/spawn.go
@@ -114,7 +114,7 @@ func Spawn[Client PingableClient](
 	}
 
 	// Find a free port.
-	addr, err := allocatePort()
+	addr, err := AllocatePort()
 	if err != nil {
 		return nil, nil, err
 	}
diff --git a/examples/java/time/src/main/java/ftl/time/Time.java b/examples/java/time/src/main/java/ftl/time/Time.java
index d27668c8cb..754e4855bd 100644
--- a/examples/java/time/src/main/java/ftl/time/Time.java
+++ b/examples/java/time/src/main/java/ftl/time/Time.java
@@ -2,25 +2,14 @@
 
 import java.time.OffsetDateTime;
 
-import io.opentelemetry.api.metrics.LongCounter;
-import io.opentelemetry.api.metrics.Meter;
 import xyz.block.ftl.Export;
 import xyz.block.ftl.Verb;
 
 public class Time {
-    final LongCounter counter;
-
-    public Time(Meter meter) {
-        counter = meter.counterBuilder("time.invocations")
-                .setDescription("The number of time invocations")
-                .setUnit("invocations")
-                .build();
-    }
 
     @Verb
     @Export
     public TimeResponse time() {
-        counter.add(1);
         return new TimeResponse(OffsetDateTime.now());
     }
 }
diff --git a/frontend/cli/cmd_box_run.go b/frontend/cli/cmd_box_run.go
index e53d668c72..8c23381540 100644
--- a/frontend/cli/cmd_box_run.go
+++ b/frontend/cli/cmd_box_run.go
@@ -12,6 +12,7 @@ import (
 
 	"github.com/TBD54566975/ftl/backend/controller"
 	"github.com/TBD54566975/ftl/backend/controller/artefacts"
+	"github.com/TBD54566975/ftl/backend/controller/scaling"
 	"github.com/TBD54566975/ftl/backend/controller/scaling/localscaling"
 	"github.com/TBD54566975/ftl/backend/controller/sql/databasetesting"
 	"github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/ftlv1connect"
@@ -60,7 +61,7 @@ func (b *boxRunCmd) Run(
 	if err != nil {
 		return fmt.Errorf("failed to create runner port allocator: %w", err)
 	}
-	runnerScaling, err := localscaling.NewLocalScaling(bindAllocator, []*url.URL{b.Bind}, "", false, b.Registry)
+	runnerScaling, err := localscaling.NewLocalScaling(bindAllocator, []*url.URL{b.Bind}, "", false, b.Registry, make(<-chan scaling.DevModeEndpoints))
 	if err != nil {
 		return fmt.Errorf("failed to create runner autoscaler: %w", err)
 	}
diff --git a/frontend/cli/cmd_dev.go b/frontend/cli/cmd_dev.go
index ca21b8c2f9..ed0ccaf074 100644
--- a/frontend/cli/cmd_dev.go
+++ b/frontend/cli/cmd_dev.go
@@ -10,6 +10,7 @@ import (
 	"github.com/alecthomas/types/optional"
 	"golang.org/x/sync/errgroup"
 
+	"github.com/TBD54566975/ftl/backend/controller/scaling"
 	"github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/ftlv1connect"
 	"github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1beta1/provisioner/provisionerconnect"
 	"github.com/TBD54566975/ftl/internal/bind"
@@ -81,6 +82,7 @@ func (d *devCmd) Run(
 		return fmt.Errorf("could not create bind allocator: %w", err)
 	}
 
+	devModeEndpointUpdates := make(chan scaling.DevModeEndpoints, 1)
 	// cmdServe will notify this channel when startup commands are complete and the controller is ready
 	controllerReady := make(chan bool, 1)
 	if !d.NoServe {
@@ -93,7 +95,7 @@ func (d *devCmd) Run(
 		}
 
 		g.Go(func() error {
-			return d.ServeCmd.run(ctx, projConfig, cm, sm, optional.Some(controllerReady), true, bindAllocator)
+			return d.ServeCmd.run(ctx, projConfig, cm, sm, optional.Some(controllerReady), true, bindAllocator, devModeEndpointUpdates)
 		})
 	}
 
@@ -105,7 +107,7 @@ func (d *devCmd) Run(
 		}
 		starting.Close()
 
-		opts := []buildengine.Option{buildengine.Parallelism(d.Build.Parallelism), buildengine.BuildEnv(d.Build.BuildEnv), buildengine.WithDevMode(true), buildengine.WithStartTime(startTime)}
+		opts := []buildengine.Option{buildengine.Parallelism(d.Build.Parallelism), buildengine.BuildEnv(d.Build.BuildEnv), buildengine.WithDevMode(devModeEndpointUpdates), buildengine.WithStartTime(startTime)}
 		if d.Lsp {
 			d.languageServer = lsp.NewServer(ctx)
 			ctx = log.ContextWithLogger(ctx, log.FromContext(ctx).AddSink(lsp.NewLogSink(d.languageServer)))
diff --git a/frontend/cli/cmd_new.go b/frontend/cli/cmd_new.go
index 1b5869b991..6938a2561c 100644
--- a/frontend/cli/cmd_new.go
+++ b/frontend/cli/cmd_new.go
@@ -55,7 +55,7 @@ func prepareNewCmd(ctx context.Context, k *kong.Kong, args []string) (optionalPl
 		return optionalPlugin, fmt.Errorf("could not find new command")
 	}
 
-	plugin, err := languageplugin.New(ctx, pluginDir(), language, "new")
+	plugin, err := languageplugin.New(ctx, pluginDir(), language, "new", false)
 	if err != nil {
 		return optionalPlugin, fmt.Errorf("could not create plugin for %v: %w", language, err)
 	}
diff --git a/frontend/cli/cmd_serve.go b/frontend/cli/cmd_serve.go
index 2c2aaae89f..16acf1d26f 100644
--- a/frontend/cli/cmd_serve.go
+++ b/frontend/cli/cmd_serve.go
@@ -21,6 +21,7 @@ import (
 	"github.com/TBD54566975/ftl"
 	"github.com/TBD54566975/ftl/backend/controller"
 	"github.com/TBD54566975/ftl/backend/controller/artefacts"
+	"github.com/TBD54566975/ftl/backend/controller/scaling"
 	"github.com/TBD54566975/ftl/backend/controller/scaling/localscaling"
 	ftlv1 "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1"
 	"github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/ftlv1connect"
@@ -67,19 +68,11 @@ func (s *serveCmd) Run(
 	if err != nil {
 		return fmt.Errorf("could not create bind allocator: %w", err)
 	}
-	return s.run(ctx, projConfig, cm, sm, optional.None[chan bool](), false, bindAllocator)
+	return s.run(ctx, projConfig, cm, sm, optional.None[chan bool](), false, bindAllocator, nil)
 }
 
 //nolint:maintidx
-func (s *serveCmd) run(
-	ctx context.Context,
-	projConfig projectconfig.Config,
-	cm *manager.Manager[configuration.Configuration],
-	sm *manager.Manager[configuration.Secrets],
-	initialised optional.Option[chan bool],
-	devMode bool,
-	bindAllocator *bind.BindAllocator,
-) error {
+func (s *serveCmd) run(ctx context.Context, projConfig projectconfig.Config, cm *manager.Manager[configuration.Configuration], sm *manager.Manager[configuration.Secrets], initialised optional.Option[chan bool], devMode bool, bindAllocator *bind.BindAllocator, devModeEndpoints <-chan scaling.DevModeEndpoints) error {
 	logger := log.FromContext(ctx)
 	controllerClient := rpc.ClientFromContext[ftlv1connect.ControllerServiceClient](ctx)
 	provisionerClient := rpc.ClientFromContext[provisionerconnect.ProvisionerServiceClient](ctx)
@@ -174,7 +167,8 @@ func (s *serveCmd) run(
 		provisionerAddresses = append(provisionerAddresses, bind)
 	}
 
-	runnerScaling, err := localscaling.NewLocalScaling(bindAllocator, controllerAddresses, projConfig.Path, devMode && !projConfig.DisableIDEIntegration, registry)
+	runnerScaling, err := localscaling.NewLocalScaling(bindAllocator, controllerAddresses, projConfig.Path, devMode && !projConfig.DisableIDEIntegration, registry, devModeEndpoints)
+
 	if err != nil {
 		return err
 	}
diff --git a/frontend/console/src/protos/xyz/block/ftl/v1/language/language_pb.ts b/frontend/console/src/protos/xyz/block/ftl/v1/language/language_pb.ts
index 3f04ee0a44..a91f399a1c 100644
--- a/frontend/console/src/protos/xyz/block/ftl/v1/language/language_pb.ts
+++ b/frontend/console/src/protos/xyz/block/ftl/v1/language/language_pb.ts
@@ -48,24 +48,31 @@ export class ModuleConfig extends Message<ModuleConfig> {
    */
   build?: string;
 
+  /**
+   * DevModeBuild is the command to build the module in dev mode.
+   *
+   * @generated from field: optional string devModeBuild = 6;
+   */
+  devModeBuild?: string;
+
   /**
    * Build lock path to prevent concurrent builds
    *
-   * @generated from field: string build_lock = 6;
+   * @generated from field: string build_lock = 7;
    */
   buildLock = "";
 
   /**
    * The directory to generate protobuf schema files into. These can be picked up by language specific build tools
    *
-   * @generated from field: optional string generated_schema_dir = 7;
+   * @generated from field: optional string generated_schema_dir = 8;
    */
   generatedSchemaDir?: string;
 
   /**
    * Patterns to watch for file changes
    *
-   * @generated from field: repeated string watch = 8;
+   * @generated from field: repeated string watch = 9;
    */
   watch: string[] = [];
 
@@ -73,7 +80,7 @@ export class ModuleConfig extends Message<ModuleConfig> {
    * LanguageConfig contains any metadata specific to a specific language.
    * These are stored in the ftl.toml file under the same key as the language (eg: "go", "java")
    *
-   * @generated from field: google.protobuf.Struct language_config = 9;
+   * @generated from field: google.protobuf.Struct language_config = 10;
    */
   languageConfig?: Struct;
 
@@ -90,10 +97,11 @@ export class ModuleConfig extends Message<ModuleConfig> {
     { no: 3, name: "language", kind: "scalar", T: 9 /* ScalarType.STRING */ },
     { no: 4, name: "deploy_dir", kind: "scalar", T: 9 /* ScalarType.STRING */ },
     { no: 5, name: "build", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
-    { no: 6, name: "build_lock", kind: "scalar", T: 9 /* ScalarType.STRING */ },
-    { no: 7, name: "generated_schema_dir", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
-    { no: 8, name: "watch", kind: "scalar", T: 9 /* ScalarType.STRING */, repeated: true },
-    { no: 9, name: "language_config", kind: "message", T: Struct },
+    { no: 6, name: "devModeBuild", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
+    { no: 7, name: "build_lock", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 8, name: "generated_schema_dir", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
+    { no: 9, name: "watch", kind: "scalar", T: 9 /* ScalarType.STRING */, repeated: true },
+    { no: 10, name: "language_config", kind: "message", T: Struct },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): ModuleConfig {
@@ -473,24 +481,31 @@ export class ModuleConfigDefaultsResponse extends Message<ModuleConfigDefaultsRe
    */
   build?: string;
 
+  /**
+   * Dev mode build command, if different from the regular build command
+   *
+   * @generated from field: optional string devModeBuild = 3;
+   */
+  devModeBuild?: string;
+
   /**
    * Build lock path to prevent concurrent builds
    *
-   * @generated from field: optional string build_lock = 3;
+   * @generated from field: optional string build_lock = 4;
    */
   buildLock?: string;
 
   /**
    * Default relative path to the directory containing generated schema files
    *
-   * @generated from field: optional string generated_schema_dir = 4;
+   * @generated from field: optional string generated_schema_dir = 5;
    */
   generatedSchemaDir?: string;
 
   /**
    * Default patterns to watch for file changes, relative to the module directory
    *
-   * @generated from field: repeated string watch = 5;
+   * @generated from field: repeated string watch = 6;
    */
   watch: string[] = [];
 
@@ -498,7 +513,7 @@ export class ModuleConfigDefaultsResponse extends Message<ModuleConfigDefaultsRe
    * Default language specific configuration.
    * These defaults are filled in by looking at each root key only. If the key is not present, the default is used.
    *
-   * @generated from field: google.protobuf.Struct language_config = 6;
+   * @generated from field: google.protobuf.Struct language_config = 7;
    */
   languageConfig?: Struct;
 
@@ -512,10 +527,11 @@ export class ModuleConfigDefaultsResponse extends Message<ModuleConfigDefaultsRe
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
     { no: 1, name: "deploy_dir", kind: "scalar", T: 9 /* ScalarType.STRING */ },
     { no: 2, name: "build", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
-    { no: 3, name: "build_lock", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
-    { no: 4, name: "generated_schema_dir", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
-    { no: 5, name: "watch", kind: "scalar", T: 9 /* ScalarType.STRING */, repeated: true },
-    { no: 6, name: "language_config", kind: "message", T: Struct },
+    { no: 3, name: "devModeBuild", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
+    { no: 4, name: "build_lock", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
+    { no: 5, name: "generated_schema_dir", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
+    { no: 6, name: "watch", kind: "scalar", T: 9 /* ScalarType.STRING */, repeated: true },
+    { no: 7, name: "language_config", kind: "message", T: Struct },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): ModuleConfigDefaultsResponse {
@@ -1094,15 +1110,30 @@ export class BuildSuccess extends Message<BuildSuccess> {
    */
   deploy: string[] = [];
 
+  /**
+   * Name of the docker image to use for the runner
+   *
+   * @generated from field: string docker_image = 5;
+   */
+  dockerImage = "";
+
   /**
    * Errors contains any errors that occurred during the build
    * No errors can have a level of ERROR, instead a BuildFailure should be sent
    * Instead this is useful for INFO and WARN level errors.
    *
-   * @generated from field: xyz.block.ftl.v1.language.ErrorList errors = 5;
+   * @generated from field: xyz.block.ftl.v1.language.ErrorList errors = 6;
    */
   errors?: ErrorList;
 
+  /**
+   * Dev mode endpoint URI. If this is set then rather than trying to deploy the module, FTL will start a runner that
+   * connects to this endpoint.
+   *
+   * @generated from field: optional string dev_endpoint = 7;
+   */
+  devEndpoint?: string;
+
   constructor(data?: PartialMessage<BuildSuccess>) {
     super();
     proto3.util.initPartial(data, this);
@@ -1115,7 +1146,9 @@ export class BuildSuccess extends Message<BuildSuccess> {
     { no: 2, name: "is_automatic_rebuild", kind: "scalar", T: 8 /* ScalarType.BOOL */ },
     { no: 3, name: "module", kind: "message", T: Module },
     { no: 4, name: "deploy", kind: "scalar", T: 9 /* ScalarType.STRING */, repeated: true },
-    { no: 5, name: "errors", kind: "message", T: ErrorList },
+    { no: 5, name: "docker_image", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 6, name: "errors", kind: "message", T: ErrorList },
+    { no: 7, name: "dev_endpoint", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): BuildSuccess {
diff --git a/go-runtime/goplugin/service_test.go b/go-runtime/goplugin/service_test.go
index 678da1e7cb..ece908589d 100644
--- a/go-runtime/goplugin/service_test.go
+++ b/go-runtime/goplugin/service_test.go
@@ -7,12 +7,14 @@ import (
 	"testing"
 
 	"connectrpc.com/connect"
+
 	langpb "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/language"
 	"github.com/TBD54566975/ftl/internal/slices"
 
-	"github.com/TBD54566975/ftl/internal/moduleconfig"
 	"github.com/alecthomas/assert/v2"
 	"github.com/alecthomas/types/optional"
+
+	"github.com/TBD54566975/ftl/internal/moduleconfig"
 )
 
 func TestParseImportsFromTestData(t *testing.T) {
@@ -113,6 +115,7 @@ func defaultsFromProto(proto *langpb.ModuleConfigDefaultsResponse) moduleconfig.
 		DeployDir:          proto.DeployDir,
 		Watch:              proto.Watch,
 		Build:              optional.Ptr(proto.Build),
+		DevModeBuild:       optional.Ptr(proto.DevModeBuild),
 		GeneratedSchemaDir: optional.Ptr(proto.GeneratedSchemaDir),
 		LanguageConfig:     proto.LanguageConfig.AsMap(),
 	}
diff --git a/internal/buildengine/build.go b/internal/buildengine/build.go
index eb623d0c2e..b712d1edb5 100644
--- a/internal/buildengine/build.go
+++ b/internal/buildengine/build.go
@@ -3,6 +3,7 @@ package buildengine
 import (
 	"context"
 	"fmt"
+	"net/url"
 	"os"
 	"path/filepath"
 	"time"
@@ -10,6 +11,7 @@ import (
 	"github.com/alecthomas/types/result"
 	"google.golang.org/protobuf/proto"
 
+	"github.com/TBD54566975/ftl/backend/controller/scaling"
 	"github.com/TBD54566975/ftl/internal/buildengine/languageplugin"
 	"github.com/TBD54566975/ftl/internal/builderrors"
 	"github.com/TBD54566975/ftl/internal/errors"
@@ -26,16 +28,16 @@ var errInvalidateDependencies = errors.New("dependencies need to be updated")
 // Plugins must use a lock file to ensure that only one build is running at a time.
 //
 // Returns invalidateDependenciesError if the build failed due to a change in dependencies.
-func build(ctx context.Context, plugin *languageplugin.LanguagePlugin, projectConfig projectconfig.Config, bctx languageplugin.BuildContext, devMode bool) (moduleSchema *schema.Module, deploy []string, err error) {
+func build(ctx context.Context, plugin *languageplugin.LanguagePlugin, projectConfig projectconfig.Config, bctx languageplugin.BuildContext, devMode bool, devModeEndpoints chan scaling.DevModeEndpoints) (moduleSchema *schema.Module, deploy []string, err error) {
 	logger := log.FromContext(ctx).Module(bctx.Config.Module).Scope("build")
 	ctx = log.ContextWithLogger(ctx, logger)
 
 	stubsRoot := stubsLanguageDir(projectConfig.Root(), bctx.Config.Language)
-	return handleBuildResult(ctx, projectConfig, bctx.Config, result.From(plugin.Build(ctx, projectConfig.Root(), stubsRoot, bctx, devMode)))
+	return handleBuildResult(ctx, projectConfig, bctx.Config, result.From(plugin.Build(ctx, projectConfig.Root(), stubsRoot, bctx, devMode)), devModeEndpoints)
 }
 
 // handleBuildResult processes the result of a build
-func handleBuildResult(ctx context.Context, projectConfig projectconfig.Config, c moduleconfig.ModuleConfig, eitherResult result.Result[languageplugin.BuildResult]) (moduleSchema *schema.Module, deploy []string, err error) {
+func handleBuildResult(ctx context.Context, projectConfig projectconfig.Config, c moduleconfig.ModuleConfig, eitherResult result.Result[languageplugin.BuildResult], devModeEndpoints chan scaling.DevModeEndpoints) (moduleSchema *schema.Module, deploy []string, err error) {
 	logger := log.FromContext(ctx)
 	config := c.Abs()
 
@@ -76,5 +78,13 @@ func handleBuildResult(ctx context.Context, projectConfig projectconfig.Config,
 	if err := os.WriteFile(schemaPath, schemaBytes, 0600); err != nil {
 		return nil, nil, fmt.Errorf("failed to write schema: %w", err)
 	}
+	if endpoint, ok := result.DevEndpoint.Get(); ok {
+		if devModeEndpoints != nil {
+			parsed, err := url.Parse(endpoint)
+			if err == nil {
+				devModeEndpoints <- scaling.DevModeEndpoints{Module: config.Module, Endpoint: *parsed}
+			}
+		}
+	}
 	return result.Schema, result.Deploy, nil
 }
diff --git a/internal/buildengine/engine.go b/internal/buildengine/engine.go
index c821f9c5c0..61f29f26af 100644
--- a/internal/buildengine/engine.go
+++ b/internal/buildengine/engine.go
@@ -18,6 +18,7 @@ import (
 	"golang.org/x/exp/maps"
 	"golang.org/x/sync/errgroup"
 
+	"github.com/TBD54566975/ftl/backend/controller/scaling"
 	ftlv1 "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1"
 	"github.com/TBD54566975/ftl/internal/buildengine/languageplugin"
 	"github.com/TBD54566975/ftl/internal/log"
@@ -185,7 +186,6 @@ type Engine struct {
 	parallelism      int
 	modulesToBuild   *xsync.MapOf[string, bool]
 	buildEnv         []string
-	devMode          bool
 	startTime        optional.Option[time.Time]
 
 	// events coming in from plugins
@@ -199,6 +199,9 @@ type Engine struct {
 
 	// topic to subscribe to engine events
 	EngineUpdates *pubsub.Topic[EngineEvent]
+
+	devModeEndpointUpdates chan scaling.DevModeEndpoints
+	devMode                bool
 }
 
 type Option func(o *Engine)
@@ -216,9 +219,10 @@ func BuildEnv(env []string) Option {
 }
 
 // WithDevMode sets the engine to dev mode.
-func WithDevMode(devMode bool) Option {
+func WithDevMode(updates chan scaling.DevModeEndpoints) Option {
 	return func(o *Engine) {
-		o.devMode = devMode
+		o.devModeEndpointUpdates = updates
+		o.devMode = true
 	}
 }
 
@@ -991,7 +995,7 @@ func (e *Engine) build(ctx context.Context, moduleName string, builtModules map[
 		Schema:       sch,
 		Dependencies: meta.module.Dependencies(Raw),
 		BuildEnv:     e.buildEnv,
-	}, e.devMode)
+	}, e.devMode, e.devModeEndpointUpdates)
 	if err != nil {
 		if errors.Is(err, errInvalidateDependencies) {
 			// Do not start a build directly as we are already building out a graph of modules.
@@ -1036,7 +1040,7 @@ func (e *Engine) gatherSchemas(
 }
 
 func (e *Engine) newModuleMeta(ctx context.Context, config moduleconfig.UnvalidatedModuleConfig) (moduleMeta, error) {
-	plugin, err := languageplugin.New(ctx, config.Dir, config.Language, config.Module)
+	plugin, err := languageplugin.New(ctx, config.Dir, config.Language, config.Module, e.devMode)
 	if err != nil {
 		return moduleMeta{}, fmt.Errorf("could not create plugin for %s: %w", config.Module, err)
 	}
@@ -1098,7 +1102,7 @@ func (e *Engine) watchForPluginEvents(originalCtx context.Context) {
 					e.rawEngineUpdates <- ModuleBuildStarted{Config: meta.module.Config, IsAutoRebuild: true}
 
 				case languageplugin.AutoRebuildEndedEvent:
-					_, deploy, err := handleBuildResult(ctx, e.projectConfig, meta.module.Config, event.Result)
+					_, deploy, err := handleBuildResult(ctx, e.projectConfig, meta.module.Config, event.Result, nil)
 					if err != nil {
 						e.rawEngineUpdates <- ModuleBuildFailed{Config: meta.module.Config, IsAutoRebuild: true, Error: err}
 						if errors.Is(err, errInvalidateDependencies) {
@@ -1111,10 +1115,12 @@ func (e *Engine) watchForPluginEvents(originalCtx context.Context) {
 					e.rawEngineUpdates <- ModuleBuildSuccess{Config: meta.module.Config, IsAutoRebuild: true}
 
 					e.rawEngineUpdates <- ModuleDeployStarted{Module: event.Module}
+
 					if err := Deploy(ctx, e.projectConfig, meta.module, deploy, 1, true, e.client); err != nil {
 						e.rawEngineUpdates <- ModuleDeployFailed{Module: event.Module, Error: err}
 						continue
 					}
+
 					e.rawEngineUpdates <- ModuleDeploySuccess{Module: event.Module}
 				}
 			case languageplugin.PluginDiedEvent:
diff --git a/internal/buildengine/languageplugin/plugin.go b/internal/buildengine/languageplugin/plugin.go
index 2b697fb844..aedf85c508 100644
--- a/internal/buildengine/languageplugin/plugin.go
+++ b/internal/buildengine/languageplugin/plugin.go
@@ -37,6 +37,9 @@ type BuildResult struct {
 
 	// Whether the module needs to recalculate its dependencies
 	InvalidateDependencies bool
+
+	// Endpoint of an instance started by the plugin to use in dev mode
+	DevEndpoint optional.Option[string]
 }
 
 // PluginEvent is used to notify of updates from the plugin.
@@ -90,7 +93,7 @@ type BuildContext struct {
 var ErrPluginNotRunning = errors.New("language plugin no longer running")
 
 // PluginFromConfig creates a new language plugin from the given config.
-func New(ctx context.Context, dir, language, name string) (p *LanguagePlugin, err error) {
+func New(ctx context.Context, dir, language, name string, devMode bool) (p *LanguagePlugin, err error) {
 	impl, err := newClientImpl(ctx, dir, language, name)
 	if err != nil {
 		return nil, err
@@ -237,6 +240,7 @@ func customDefaultsFromProto(proto *langpb.ModuleConfigDefaultsResponse) modulec
 		DeployDir:          proto.DeployDir,
 		Watch:              proto.Watch,
 		Build:              optional.Ptr(proto.Build),
+		DevModeBuild:       optional.Ptr(proto.DevModeBuild),
 		BuildLock:          optional.Ptr(proto.BuildLock),
 		GeneratedSchemaDir: optional.Ptr(proto.GeneratedSchemaDir),
 		LanguageConfig:     proto.LanguageConfig.AsMap(),
@@ -562,10 +566,11 @@ func buildResultFromProto(result either.Either[*langpb.BuildEvent_BuildSuccess,
 		errs := langpb.ErrorsFromProto(buildSuccess.Errors)
 		builderrors.SortErrorsByPosition(errs)
 		return BuildResult{
-			Errors:    errs,
-			Schema:    moduleSch,
-			Deploy:    buildSuccess.Deploy,
-			StartTime: startTime,
+			Errors:      errs,
+			Schema:      moduleSch,
+			Deploy:      buildSuccess.Deploy,
+			StartTime:   startTime,
+			DevEndpoint: optional.Ptr(buildSuccess.DevEndpoint),
 		}, nil
 	case either.Right[*langpb.BuildEvent_BuildSuccess, *langpb.BuildEvent_BuildFailure]:
 		buildFailure := result.Get().BuildFailure
diff --git a/internal/buildengine/languageplugin/plugin_client.go b/internal/buildengine/languageplugin/plugin_client.go
index 74e590457a..fd07132568 100644
--- a/internal/buildengine/languageplugin/plugin_client.go
+++ b/internal/buildengine/languageplugin/plugin_client.go
@@ -55,17 +55,18 @@ func newClientImpl(ctx context.Context, dir, language, name string) (*pluginClie
 func (p *pluginClientImpl) start(ctx context.Context, dir, language, name string) error {
 	cmdName := "ftl-language-" + language
 	cmdPath, err := exec.LookPath(cmdName)
+
 	if err != nil {
 		return fmt.Errorf("failed to find plugin for %s: %w", language, err)
 	}
-
+	envvars := []string{"FTL_NAME=" + name}
 	plugin, cmdCtx, err := plugin.Spawn(ctx,
 		log.FromContext(ctx).GetLevel(),
 		name,
 		dir,
 		cmdPath,
 		langconnect.NewLanguageServiceClient,
-		plugin.WithEnvars("FTL_NAME="+name),
+		plugin.WithEnvars(envvars...),
 	)
 	if err != nil {
 		return fmt.Errorf("failed to spawn plugin for %s: %w", name, err)
diff --git a/internal/buildengine/languageplugin/plugin_integration_test.go b/internal/buildengine/languageplugin/plugin_integration_test.go
index a933a894dd..c33ff579e1 100644
--- a/internal/buildengine/languageplugin/plugin_integration_test.go
+++ b/internal/buildengine/languageplugin/plugin_integration_test.go
@@ -160,7 +160,7 @@ func TestBuildLock(t *testing.T) {
 	sch := generateInitialSchema(t)
 
 	in.Run(t,
-		in.WithLanguages("go", "java"),
+		in.WithLanguages("go"),
 		in.WithoutController(),
 		in.CopyModule(MODULE_NAME),
 		startPlugin(),
diff --git a/internal/buildengine/languageplugin/plugin_test.go b/internal/buildengine/languageplugin/plugin_test.go
index f1c94089d3..015cb66a97 100644
--- a/internal/buildengine/languageplugin/plugin_test.go
+++ b/internal/buildengine/languageplugin/plugin_test.go
@@ -14,6 +14,7 @@ import (
 	"github.com/alecthomas/types/result"
 
 	"connectrpc.com/connect"
+
 	langpb "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/language"
 	"github.com/TBD54566975/ftl/internal/builderrors"
 	"github.com/TBD54566975/ftl/internal/log"
@@ -84,6 +85,7 @@ func buildContextFromProto(proto *langpb.BuildContext) (BuildContext, error) {
 			Realm:              "test",
 			Module:             proto.ModuleConfig.Name,
 			Build:              optional.Ptr(proto.ModuleConfig.Build).Default(""),
+			DevModeBuild:       optional.Ptr(proto.ModuleConfig.DevModeBuild).Default(""),
 			DeployDir:          proto.ModuleConfig.DeployDir,
 			GeneratedSchemaDir: optional.Ptr(proto.ModuleConfig.GeneratedSchemaDir).Default(""),
 			Watch:              proto.ModuleConfig.Watch,
diff --git a/internal/moduleconfig/moduleconfig.go b/internal/moduleconfig/moduleconfig.go
index 049dae54a6..09c1ccf4d8 100644
--- a/internal/moduleconfig/moduleconfig.go
+++ b/internal/moduleconfig/moduleconfig.go
@@ -24,6 +24,8 @@ type ModuleConfig struct {
 	Module   string `toml:"module"`
 	// Build is the command to build the module.
 	Build string `toml:"build"`
+	// Build is the command to build the module in dev mode.
+	DevModeBuild string `toml:"dev-mode-build"`
 	// BuildLock is file lock path to prevent concurrent builds of a module.
 	BuildLock string `toml:"build-lock"`
 	// DeployDir is the directory to deploy from, relative to the module directory.
@@ -58,6 +60,7 @@ type CustomDefaults struct {
 	Watch              []string
 	BuildLock          optional.Option[string]
 	Build              optional.Option[string]
+	DevModeBuild       optional.Option[string]
 	GeneratedSchemaDir optional.Option[string]
 
 	// only the root keys in LanguageConfig are used to find missing values that can be defaulted
@@ -150,6 +153,9 @@ func (c UnvalidatedModuleConfig) FillDefaultsAndValidate(customDefaults CustomDe
 	if defaultValue, ok := customDefaults.Build.Get(); ok && c.Build == "" {
 		c.Build = defaultValue
 	}
+	if defaultValue, ok := customDefaults.DevModeBuild.Get(); ok && c.DevModeBuild == "" {
+		c.DevModeBuild = defaultValue
+	}
 	if c.BuildLock == "" {
 		if defaultValue, ok := customDefaults.BuildLock.Get(); ok {
 			c.BuildLock = defaultValue
diff --git a/internal/moduleconfig/moduleconfig_test.go b/internal/moduleconfig/moduleconfig_test.go
index 7079047650..7bd837b3f8 100644
--- a/internal/moduleconfig/moduleconfig_test.go
+++ b/internal/moduleconfig/moduleconfig_test.go
@@ -23,6 +23,7 @@ func TestDefaulting(t *testing.T) {
 			},
 			defaults: CustomDefaults{
 				Build:              optional.Some("build"),
+				DevModeBuild:       optional.Some("devmodebuild"),
 				BuildLock:          optional.Some("customdefaultlock"),
 				DeployDir:          "deploydir",
 				GeneratedSchemaDir: optional.Some("generatedschemadir"),
@@ -34,6 +35,7 @@ func TestDefaulting(t *testing.T) {
 				Module:             "nothingset",
 				Language:           "test",
 				Build:              "build",
+				DevModeBuild:       "devmodebuild",
 				BuildLock:          "customdefaultlock",
 				DeployDir:          "deploydir",
 				GeneratedSchemaDir: "generatedschemadir",
@@ -46,6 +48,7 @@ func TestDefaulting(t *testing.T) {
 				Module:             "allset",
 				Language:           "test",
 				Build:              "custombuild",
+				DevModeBuild:       "customdevmodebuild",
 				BuildLock:          "custombuildlock",
 				DeployDir:          "customdeploydir",
 				GeneratedSchemaDir: "customgeneratedschemadir",
@@ -57,6 +60,7 @@ func TestDefaulting(t *testing.T) {
 			},
 			defaults: CustomDefaults{
 				Build:              optional.Some("build"),
+				DevModeBuild:       optional.Some("devmodebuild"),
 				DeployDir:          "deploydir",
 				GeneratedSchemaDir: optional.Some("generatedschemadir"),
 				Watch:              []string{"a", "b", "c"},
@@ -67,6 +71,7 @@ func TestDefaulting(t *testing.T) {
 				Module:             "allset",
 				Language:           "test",
 				Build:              "custombuild",
+				DevModeBuild:       "customdevmodebuild",
 				BuildLock:          "custombuildlock",
 				DeployDir:          "customdeploydir",
 				GeneratedSchemaDir: "customgeneratedschemadir",
diff --git a/jvm-runtime/ftl-runtime/common/deployment/pom.xml b/jvm-runtime/ftl-runtime/common/deployment/pom.xml
index 72d4d26f41..0e80fcb3c1 100644
--- a/jvm-runtime/ftl-runtime/common/deployment/pom.xml
+++ b/jvm-runtime/ftl-runtime/common/deployment/pom.xml
@@ -23,6 +23,10 @@
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-rest-jackson-deployment</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-smallrye-health-deployment</artifactId>
+        </dependency>
         <dependency>
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-opentelemetry-deployment</artifactId>
diff --git a/jvm-runtime/ftl-runtime/common/runtime/pom.xml b/jvm-runtime/ftl-runtime/common/runtime/pom.xml
index 19feaf84ed..48a3bdeb5d 100644
--- a/jvm-runtime/ftl-runtime/common/runtime/pom.xml
+++ b/jvm-runtime/ftl-runtime/common/runtime/pom.xml
@@ -20,6 +20,10 @@
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-grpc</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-smallrye-health</artifactId>
+        </dependency>
         <dependency>
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-rest-jackson</artifactId>
diff --git a/jvm-runtime/plugin/common/java_plugin_test.go b/jvm-runtime/plugin/common/java_plugin_test.go
index ca21dc5c5f..2199fd6748 100644
--- a/jvm-runtime/plugin/common/java_plugin_test.go
+++ b/jvm-runtime/plugin/common/java_plugin_test.go
@@ -37,6 +37,7 @@ func TestJavaConfigDefaults(t *testing.T) {
 			dir:      "testdata/kotlin/echo",
 			expected: moduleconfig.CustomDefaults{
 				Build:              optional.Some("mvn -B package"),
+				DevModeBuild:       optional.Some("mvn quarkus:dev"),
 				DeployDir:          "target",
 				GeneratedSchemaDir: optional.Some("src/main/ftl-module-schema"),
 				Watch:              watch,
@@ -50,6 +51,7 @@ func TestJavaConfigDefaults(t *testing.T) {
 			dir:      "testdata/kotlin/external",
 			expected: moduleconfig.CustomDefaults{
 				Build:              optional.Some("mvn -B package"),
+				DevModeBuild:       optional.Some("mvn quarkus:dev"),
 				DeployDir:          "target",
 				GeneratedSchemaDir: optional.Some("src/main/ftl-module-schema"),
 				Watch:              watch,
@@ -67,7 +69,7 @@ func TestJavaConfigDefaults(t *testing.T) {
 			dir, err := filepath.Abs(tt.dir)
 			assert.NoError(t, err)
 
-			plugin, err := languageplugin.New(ctx, t.TempDir(), "java", "test")
+			plugin, err := languageplugin.New(ctx, t.TempDir(), "java", "test", false)
 			assert.NoError(t, err)
 			t.Cleanup(func() {
 				_ = plugin.Kill() //nolint:errcheck
diff --git a/jvm-runtime/plugin/common/jvmcommon.go b/jvm-runtime/plugin/common/jvmcommon.go
index 890827598b..c19507b6d9 100644
--- a/jvm-runtime/plugin/common/jvmcommon.go
+++ b/jvm-runtime/plugin/common/jvmcommon.go
@@ -6,6 +6,7 @@ import (
 	"context"
 	"fmt"
 	"io/fs"
+	"net/http"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -29,6 +30,7 @@ import (
 	langpb "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/language"
 	langconnect "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/language/languagepbconnect"
 	schemapb "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/schema"
+	"github.com/TBD54566975/ftl/common/plugin"
 	"github.com/TBD54566975/ftl/internal"
 	"github.com/TBD54566975/ftl/internal/builderrors"
 	"github.com/TBD54566975/ftl/internal/errors"
@@ -37,11 +39,14 @@ import (
 	"github.com/TBD54566975/ftl/internal/log"
 	"github.com/TBD54566975/ftl/internal/moduleconfig"
 	"github.com/TBD54566975/ftl/internal/schema"
+	"github.com/TBD54566975/ftl/internal/sha256"
 	islices "github.com/TBD54566975/ftl/internal/slices"
 	"github.com/TBD54566975/ftl/internal/watch"
 )
 
 const BuildLockTimeout = time.Minute
+const SchemaFile = "schema.pb"
+const ErrorFile = "errors.pb"
 
 //sumtype:decl
 type updateEvent interface{ updateEvent() }
@@ -167,6 +172,9 @@ func (s *Service) SyncStubReferences(ctx context.Context, req *connect.Request[l
 // rebuild must include the latest build context id provided by the request or subsequent BuildContextUpdated
 // calls.
 func (s *Service) Build(ctx context.Context, req *connect.Request[langpb.BuildRequest], stream *connect.ServerStream[langpb.BuildEvent]) error {
+	if req.Msg.RebuildAutomatically {
+		return s.handleDevModeRequest(ctx, req, stream)
+	}
 	events := make(chan updateEvent, 32)
 	s.updatesTopic.Subscribe(events)
 	defer s.updatesTopic.Unsubscribe(events)
@@ -231,6 +239,154 @@ func (s *Service) Build(ctx context.Context, req *connect.Request[langpb.BuildRe
 	}
 }
 
+func (s *Service) handleDevModeRequest(ctx context.Context, req *connect.Request[langpb.BuildRequest], stream *connect.ServerStream[langpb.BuildEvent]) error {
+	logger := log.FromContext(ctx)
+
+	first := true
+	buildCtx, err := buildContextFromProto(req.Msg.BuildContext)
+	if err != nil {
+		return err
+	}
+	release, err := flock.Acquire(ctx, buildCtx.Config.BuildLock, BuildLockTimeout)
+	if err != nil {
+		return fmt.Errorf("could not acquire build lock: %w", err)
+	}
+	defer release() //nolint:errcheck
+	address, err := plugin.AllocatePort()
+	if err != nil {
+		return fmt.Errorf("could not allocate port: %w", err)
+	}
+	errorFile := filepath.Join(buildCtx.Config.DeployDir, ErrorFile)
+	schemaFile := filepath.Join(buildCtx.Config.DeployDir, SchemaFile)
+	os.Remove(errorFile)
+	os.Remove(schemaFile)
+	errorHash := sha256.SHA256{}
+	schemaHash := sha256.SHA256{}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	ctx = log.ContextWithLogger(ctx, logger)
+	bind := fmt.Sprintf("http://localhost:%d", address.Port)
+	go func() {
+		logger.Infof("Using build command '%s'", buildCtx.Config.DevModeBuild)
+		command := exec.Command(ctx, log.Debug, buildCtx.Config.Dir, "bash", "-c", buildCtx.Config.DevModeBuild)
+		command.Env = append(command.Env, fmt.Sprintf("FTL_BIND=%s", bind))
+		command.Stdout = os.Stdout
+		command.Stderr = os.Stderr
+		err = command.RunBuffered(ctx)
+		if err != nil {
+			logger.Errorf(err, "Dev mode process exited with error")
+		} else {
+			logger.Infof("Dev mode process exited")
+		}
+		cancel()
+	}()
+
+	schemaChangeTicker := time.NewTicker(100 * time.Millisecond)
+	forceReloadTicker := time.NewTicker(time.Second)
+	for {
+		select {
+		case <-ctx.Done():
+			return nil
+		case <-schemaChangeTicker.C:
+			select {
+			// We only force a reload every second, but we check for schema changes every 100ms
+			case <-forceReloadTicker.C:
+				if !first {
+					// Force a hot reload via HTTP request
+					resp, err := http.Head(bind) // #nosec
+					if err == nil {
+						resp.Body.Close()
+					}
+				}
+			default:
+			}
+
+			changed := false
+			file, err := os.ReadFile(errorFile)
+			if err == nil {
+				sum := sha256.Sum(file)
+				if sum != errorHash {
+					changed = true
+					errorHash = sum
+				}
+			}
+			file, err = os.ReadFile(schemaFile)
+			if err == nil {
+				sum := sha256.Sum(file)
+				if sum != schemaHash {
+					changed = true
+					schemaHash = sum
+				}
+			}
+			if changed {
+				if !first {
+					logger.Infof("New schema detected, doing fast redeploy")
+				}
+				buildErrs, err := loadProtoErrors(buildCtx.Config)
+				if err != nil {
+					err = stream.Send(&langpb.BuildEvent{Event: &langpb.BuildEvent_BuildFailure{
+						BuildFailure: &langpb.BuildFailure{
+							IsAutomaticRebuild: !first,
+							ContextId:          buildCtx.ID,
+							Errors:             &langpb.ErrorList{Errors: []*langpb.Error{{Msg: err.Error(), Level: langpb.Error_ERROR, Type: langpb.Error_FTL}}},
+						}}})
+					if err != nil {
+						return fmt.Errorf("could not send build event: %w", err)
+					}
+					first = false
+					continue
+				}
+				if builderrors.ContainsTerminalError(langpb.ErrorsFromProto(buildErrs)) {
+					// skip reading schema
+					err = stream.Send(&langpb.BuildEvent{Event: &langpb.BuildEvent_BuildFailure{
+						BuildFailure: &langpb.BuildFailure{
+							IsAutomaticRebuild: !first,
+							ContextId:          buildCtx.ID,
+							Errors:             buildErrs,
+						}}})
+					if err != nil {
+						return fmt.Errorf("could not send build event: %w", err)
+					}
+					first = false
+					continue
+				}
+
+				moduleProto, err := readSchema(buildCtx)
+				if err != nil {
+					err = stream.Send(&langpb.BuildEvent{Event: &langpb.BuildEvent_BuildFailure{
+						BuildFailure: &langpb.BuildFailure{
+							IsAutomaticRebuild: !first,
+							ContextId:          buildCtx.ID,
+							Errors:             &langpb.ErrorList{Errors: []*langpb.Error{{Msg: err.Error(), Level: langpb.Error_ERROR, Type: langpb.Error_FTL}}},
+						}}})
+					if err != nil {
+						return fmt.Errorf("could not send build event: %w", err)
+					}
+					first = false
+					continue
+				}
+
+				err = stream.Send(&langpb.BuildEvent{
+					Event: &langpb.BuildEvent_BuildSuccess{
+						BuildSuccess: &langpb.BuildSuccess{
+							ContextId:          req.Msg.BuildContext.Id,
+							IsAutomaticRebuild: !first,
+							Module:             moduleProto,
+							DevEndpoint:        ptr(fmt.Sprintf("http://localhost:%d", address.Port)),
+							Deploy:             []string{SchemaFile},
+						},
+					},
+				})
+				if err != nil {
+					return fmt.Errorf("could not send build event: %w", err)
+				}
+				first = false
+			}
+
+		}
+	}
+}
+
 func build(ctx context.Context, bctx buildContext, autoRebuild bool, transaction watch.ModifyFilesTransaction) (*langpb.BuildEvent, error) {
 	logger := log.FromContext(ctx)
 	release, err := flock.Acquire(ctx, bctx.Config.BuildLock, BuildLockTimeout)
@@ -301,19 +457,10 @@ func build(ctx context.Context, bctx buildContext, autoRebuild bool, transaction
 			}}}, nil
 	}
 
-	moduleSchema, err := schema.ModuleFromProtoFile(filepath.Join(config.DeployDir, "schema.pb"))
+	moduleProto, err := readSchema(bctx)
 	if err != nil {
-		return nil, fmt.Errorf("failed to read schema for module: %w", err)
-	}
-
-	moduleSchema.Runtime = &schema.ModuleRuntime{
-		CreateTime:  time.Now(),
-		Language:    bctx.Config.Language,
-		MinReplicas: 1,
-		Image:       "ftl0/ftl-runner-jvm",
+		return nil, err
 	}
-
-	moduleProto := moduleSchema.ToProto().(*schemapb.Module) //nolint:forcetypeassert
 	return &langpb.BuildEvent{
 		Event: &langpb.BuildEvent_BuildSuccess{
 			BuildSuccess: &langpb.BuildSuccess{
@@ -327,6 +474,24 @@ func build(ctx context.Context, bctx buildContext, autoRebuild bool, transaction
 	}, nil
 }
 
+func readSchema(bctx buildContext) (*schemapb.Module, error) {
+	path := filepath.Join(bctx.Config.DeployDir, SchemaFile)
+	moduleSchema, err := schema.ModuleFromProtoFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read schema for module: %s from %s %w", bctx.Config.Module, path, err)
+	}
+
+	moduleSchema.Runtime = &schema.ModuleRuntime{
+		CreateTime:  time.Now(),
+		Language:    bctx.Config.Language,
+		MinReplicas: 1,
+		Image:       "ftl0/ftl-runner-jvm",
+	}
+
+	moduleProto := moduleSchema.ToProto().(*schemapb.Module) //nolint:forcetypeassert
+	return moduleProto, nil
+}
+
 // BuildContextUpdated is called whenever the build context is update while a Build call with "rebuild_automatically" is active.
 //
 // Each time this call is made, the Build call must send back a corresponding BuildSuccess or BuildFailure
@@ -493,10 +658,12 @@ func (s *Service) ModuleConfigDefaults(ctx context.Context, req *connect.Request
 	buildGradleKts := filepath.Join(dir, "build.gradle.kts")
 	if fileExists(pom) {
 		defaults.LanguageConfig.Fields["build-tool"] = structpb.NewStringValue(JavaBuildToolMaven)
+		defaults.DevModeBuild = ptr("mvn quarkus:dev")
 		defaults.Build = ptr("mvn -B package")
 		defaults.DeployDir = "target"
 	} else if fileExists(buildGradle) || fileExists(buildGradleKts) {
 		defaults.LanguageConfig.Fields["build-tool"] = structpb.NewStringValue(JavaBuildToolGradle)
+		defaults.DevModeBuild = ptr("gradle quarkusDev")
 		defaults.Build = ptr("gradle build")
 		defaults.DeployDir = "build"
 	} else {
diff --git a/python-runtime/ftl/src/ftl/protos/xyz/block/ftl/v1/language/language_pb2.py b/python-runtime/ftl/src/ftl/protos/xyz/block/ftl/v1/language/language_pb2.py
index cbe141552f..b54318260a 100644
--- a/python-runtime/ftl/src/ftl/protos/xyz/block/ftl/v1/language/language_pb2.py
+++ b/python-runtime/ftl/src/ftl/protos/xyz/block/ftl/v1/language/language_pb2.py
@@ -27,7 +27,7 @@
 from xyz.block.ftl.v1.schema import schema_pb2 as xyz_dot_block_dot_ftl_dot_v1_dot_schema_dot_schema__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n(xyz/block/ftl/v1/language/language.proto\x12\x19xyz.block.ftl.v1.language\x1a\x1cgoogle/protobuf/struct.proto\x1a\x1axyz/block/ftl/v1/ftl.proto\x1a$xyz/block/ftl/v1/schema/schema.proto\"\xdb\x02\n\x0cModuleConfig\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12\x10\n\x03\x64ir\x18\x02 \x01(\tR\x03\x64ir\x12\x1a\n\x08language\x18\x03 \x01(\tR\x08language\x12\x1d\n\ndeploy_dir\x18\x04 \x01(\tR\tdeployDir\x12\x19\n\x05\x62uild\x18\x05 \x01(\tH\x00R\x05\x62uild\x88\x01\x01\x12\x1d\n\nbuild_lock\x18\x06 \x01(\tR\tbuildLock\x12\x35\n\x14generated_schema_dir\x18\x07 \x01(\tH\x01R\x12generatedSchemaDir\x88\x01\x01\x12\x14\n\x05watch\x18\x08 \x03(\tR\x05watch\x12@\n\x0flanguage_config\x18\t \x01(\x0b\x32\x17.google.protobuf.StructR\x0elanguageConfigB\x08\n\x06_buildB\x17\n\x15_generated_schema_dir\"d\n\rProjectConfig\x12\x10\n\x03\x64ir\x18\x01 \x01(\tR\x03\x64ir\x12\x12\n\x04name\x18\x02 \x01(\tR\x04name\x12\x15\n\x06no_git\x18\x03 \x01(\x08R\x05noGit\x12\x16\n\x06hermit\x18\x04 \x01(\x08R\x06hermit\"9\n\x1bGetCreateModuleFlagsRequest\x12\x1a\n\x08language\x18\x01 \x01(\tR\x08language\"\xcf\x02\n\x1cGetCreateModuleFlagsResponse\x12R\n\x05\x66lags\x18\x01 \x03(\x0b\x32<.xyz.block.ftl.v1.language.GetCreateModuleFlagsResponse.FlagR\x05\x66lags\x1a\xda\x01\n\x04\x46lag\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12\x12\n\x04help\x18\x02 \x01(\tR\x04help\x12\x19\n\x05\x65nvar\x18\x03 \x01(\tH\x00R\x05\x65nvar\x88\x01\x01\x12\x19\n\x05short\x18\x04 \x01(\tH\x01R\x05short\x88\x01\x01\x12%\n\x0bplaceholder\x18\x05 \x01(\tH\x02R\x0bplaceholder\x88\x01\x01\x12\x1d\n\x07\x64\x65\x66\x61ult\x18\x06 \x01(\tH\x03R\x07\x64\x65\x66\x61ult\x88\x01\x01\x42\x08\n\x06_envarB\x08\n\x06_shortB\x0e\n\x0c_placeholderB\n\n\x08_default\"\xbb\x01\n\x13\x43reateModuleRequest\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12\x10\n\x03\x64ir\x18\x02 \x01(\tR\x03\x64ir\x12O\n\x0eproject_config\x18\x03 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\x03(\tR\x07modules\"\x1c\n\x1aSyncStubReferencesResponse2\xb0\x08\n\x0fLanguageService\x12J\n\x04Ping\x12\x1d.xyz.block.ftl.v1.PingRequest\x1a\x1e.xyz.block.ftl.v1.PingResponse\"\x03\x90\x02\x01\x12\x87\x01\n\x14GetCreateModuleFlags\x12\x36.xyz.block.ftl.v1.language.GetCreateModuleFlagsRequest\x1a\x37.xyz.block.ftl.v1.language.GetCreateModuleFlagsResponse\x12o\n\x0c\x43reateModule\x12..xyz.block.ftl.v1.language.CreateModuleRequest\x1a/.xyz.block.ftl.v1.language.CreateModuleResponse\x12\x87\x01\n\x14ModuleConfigDefaults\x12\x36.xyz.block.ftl.v1.language.ModuleConfigDefaultsRequest\x1a\x37.xyz.block.ftl.v1.language.ModuleConfigDefaultsResponse\x12r\n\x0fGetDependencies\x12..xyz.block.ftl.v1.language.DependenciesRequest\x1a/.xyz.block.ftl.v1.language.DependenciesResponse\x12Y\n\x05\x42uild\x12\'.xyz.block.ftl.v1.language.BuildRequest\x1a%.xyz.block.ftl.v1.language.BuildEvent0\x01\x12\x84\x01\n\x13\x42uildContextUpdated\x12\x35.xyz.block.ftl.v1.language.BuildContextUpdatedRequest\x1a\x36.xyz.block.ftl.v1.language.BuildContextUpdatedResponse\x12r\n\rGenerateStubs\x12/.xyz.block.ftl.v1.language.GenerateStubsRequest\x1a\x30.xyz.block.ftl.v1.language.GenerateStubsResponse\x12\x81\x01\n\x12SyncStubReferences\x12\x34.xyz.block.ftl.v1.language.SyncStubReferencesRequest\x1a\x35.xyz.block.ftl.v1.language.SyncStubReferencesResponseBRP\x01ZNgithub.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/language;languagepbb\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n(xyz/block/ftl/v1/language/language.proto\x12\x19xyz.block.ftl.v1.language\x1a\x1cgoogle/protobuf/struct.proto\x1a\x1axyz/block/ftl/v1/ftl.proto\x1a$xyz/block/ftl/v1/schema/schema.proto\"\x95\x03\n\x0cModuleConfig\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12\x10\n\x03\x64ir\x18\x02 \x01(\tR\x03\x64ir\x12\x1a\n\x08language\x18\x03 \x01(\tR\x08language\x12\x1d\n\ndeploy_dir\x18\x04 \x01(\tR\tdeployDir\x12\x19\n\x05\x62uild\x18\x05 \x01(\tH\x00R\x05\x62uild\x88\x01\x01\x12\'\n\x0c\x64\x65vModeBuild\x18\x06 \x01(\tH\x01R\x0c\x64\x65vModeBuild\x88\x01\x01\x12\x1d\n\nbuild_lock\x18\x07 \x01(\tR\tbuildLock\x12\x35\n\x14generated_schema_dir\x18\x08 \x01(\tH\x02R\x12generatedSchemaDir\x88\x01\x01\x12\x14\n\x05watch\x18\t \x03(\tR\x05watch\x12@\n\x0flanguage_config\x18\n \x01(\x0b\x32\x17.google.protobuf.StructR\x0elanguageConfigB\x08\n\x06_buildB\x0f\n\r_devModeBuildB\x17\n\x15_generated_schema_dir\"d\n\rProjectConfig\x12\x10\n\x03\x64ir\x18\x01 \x01(\tR\x03\x64ir\x12\x12\n\x04name\x18\x02 \x01(\tR\x04name\x12\x15\n\x06no_git\x18\x03 \x01(\x08R\x05noGit\x12\x16\n\x06hermit\x18\x04 \x01(\x08R\x06hermit\"9\n\x1bGetCreateModuleFlagsRequest\x12\x1a\n\x08language\x18\x01 \x01(\tR\x08language\"\xcf\x02\n\x1cGetCreateModuleFlagsResponse\x12R\n\x05\x66lags\x18\x01 \x03(\x0b\x32<.xyz.block.ftl.v1.language.GetCreateModuleFlagsResponse.FlagR\x05\x66lags\x1a\xda\x01\n\x04\x46lag\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12\x12\n\x04help\x18\x02 \x01(\tR\x04help\x12\x19\n\x05\x65nvar\x18\x03 \x01(\tH\x00R\x05\x65nvar\x88\x01\x01\x12\x19\n\x05short\x18\x04 \x01(\tH\x01R\x05short\x88\x01\x01\x12%\n\x0bplaceholder\x18\x05 \x01(\tH\x02R\x0bplaceholder\x88\x01\x01\x12\x1d\n\x07\x64\x65\x66\x61ult\x18\x06 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
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -38,61 +38,61 @@
   _globals['_LANGUAGESERVICE'].methods_by_name['Ping']._loaded_options = None
   _globals['_LANGUAGESERVICE'].methods_by_name['Ping']._serialized_options = b'\220\002\001'
   _globals['_MODULECONFIG']._serialized_start=168
-  _globals['_MODULECONFIG']._serialized_end=515
-  _globals['_PROJECTCONFIG']._serialized_start=517
-  _globals['_PROJECTCONFIG']._serialized_end=617
-  _globals['_GETCREATEMODULEFLAGSREQUEST']._serialized_start=619
-  _globals['_GETCREATEMODULEFLAGSREQUEST']._serialized_end=676
-  _globals['_GETCREATEMODULEFLAGSRESPONSE']._serialized_start=679
-  _globals['_GETCREATEMODULEFLAGSRESPONSE']._serialized_end=1014
-  _globals['_GETCREATEMODULEFLAGSRESPONSE_FLAG']._serialized_start=796
-  _globals['_GETCREATEMODULEFLAGSRESPONSE_FLAG']._serialized_end=1014
-  _globals['_CREATEMODULEREQUEST']._serialized_start=1017
-  _globals['_CREATEMODULEREQUEST']._serialized_end=1204
-  _globals['_CREATEMODULERESPONSE']._serialized_start=1206
-  _globals['_CREATEMODULERESPONSE']._serialized_end=1228
-  _globals['_MODULECONFIGDEFAULTSREQUEST']._serialized_start=1230
-  _globals['_MODULECONFIGDEFAULTSREQUEST']._serialized_end=1277
-  _globals['_MODULECONFIGDEFAULTSRESPONSE']._serialized_start=1280
-  _globals['_MODULECONFIGDEFAULTSRESPONSE']._serialized_end=1597
-  _globals['_DEPENDENCIESREQUEST']._serialized_start=1599
-  _globals['_DEPENDENCIESREQUEST']._serialized_end=1698
-  _globals['_DEPENDENCIESRESPONSE']._serialized_start=1700
-  _globals['_DEPENDENCIESRESPONSE']._serialized_end=1748
-  _globals['_BUILDCONTEXT']._serialized_start=1751
-  _globals['_BUILDCONTEXT']._serialized_end=1981
-  _globals['_BUILDCONTEXTUPDATEDREQUEST']._serialized_start=1983
-  _globals['_BUILDCONTEXTUPDATEDREQUEST']._serialized_end=2088
-  _globals['_BUILDCONTEXTUPDATEDRESPONSE']._serialized_start=2090
-  _globals['_BUILDCONTEXTUPDATEDRESPONSE']._serialized_end=2119
-  _globals['_ERROR']._serialized_start=2122
-  _globals['_ERROR']._serialized_end=2427
-  _globals['_ERROR_ERRORLEVEL']._serialized_start=2340
-  _globals['_ERROR_ERRORLEVEL']._serialized_end=2383
-  _globals['_ERROR_ERRORTYPE']._serialized_start=2385
-  _globals['_ERROR_ERRORTYPE']._serialized_end=2419
-  _globals['_POSITION']._serialized_start=2429
-  _globals['_POSITION']._serialized_end=2551
-  _globals['_ERRORLIST']._serialized_start=2553
-  _globals['_ERRORLIST']._serialized_end=2622
-  _globals['_BUILDREQUEST']._serialized_start=2625
-  _globals['_BUILDREQUEST']._serialized_end=2836
-  _globals['_AUTOREBUILDSTARTED']._serialized_start=2838
-  _globals['_AUTOREBUILDSTARTED']._serialized_end=2889
-  _globals['_BUILDSUCCESS']._serialized_start=2892
-  _globals['_BUILDSUCCESS']._serialized_end=3130
-  _globals['_BUILDFAILURE']._serialized_start=3133
-  _globals['_BUILDFAILURE']._serialized_end=3347
-  _globals['_BUILDEVENT']._serialized_start=3350
-  _globals['_BUILDEVENT']._serialized_end=3630
-  _globals['_GENERATESTUBSREQUEST']._serialized_start=3633
-  _globals['_GENERATESTUBSREQUEST']._serialized_end=3929
-  _globals['_GENERATESTUBSRESPONSE']._serialized_start=3931
-  _globals['_GENERATESTUBSRESPONSE']._serialized_end=3954
-  _globals['_SYNCSTUBREFERENCESREQUEST']._serialized_start=3957
-  _globals['_SYNCSTUBREFERENCESREQUEST']._serialized_end=4119
-  _globals['_SYNCSTUBREFERENCESRESPONSE']._serialized_start=4121
-  _globals['_SYNCSTUBREFERENCESRESPONSE']._serialized_end=4149
-  _globals['_LANGUAGESERVICE']._serialized_start=4152
-  _globals['_LANGUAGESERVICE']._serialized_end=5224
+  _globals['_MODULECONFIG']._serialized_end=573
+  _globals['_PROJECTCONFIG']._serialized_start=575
+  _globals['_PROJECTCONFIG']._serialized_end=675
+  _globals['_GETCREATEMODULEFLAGSREQUEST']._serialized_start=677
+  _globals['_GETCREATEMODULEFLAGSREQUEST']._serialized_end=734
+  _globals['_GETCREATEMODULEFLAGSRESPONSE']._serialized_start=737
+  _globals['_GETCREATEMODULEFLAGSRESPONSE']._serialized_end=1072
+  _globals['_GETCREATEMODULEFLAGSRESPONSE_FLAG']._serialized_start=854
+  _globals['_GETCREATEMODULEFLAGSRESPONSE_FLAG']._serialized_end=1072
+  _globals['_CREATEMODULEREQUEST']._serialized_start=1075
+  _globals['_CREATEMODULEREQUEST']._serialized_end=1262
+  _globals['_CREATEMODULERESPONSE']._serialized_start=1264
+  _globals['_CREATEMODULERESPONSE']._serialized_end=1286
+  _globals['_MODULECONFIGDEFAULTSREQUEST']._serialized_start=1288
+  _globals['_MODULECONFIGDEFAULTSREQUEST']._serialized_end=1335
+  _globals['_MODULECONFIGDEFAULTSRESPONSE']._serialized_start=1338
+  _globals['_MODULECONFIGDEFAULTSRESPONSE']._serialized_end=1713
+  _globals['_DEPENDENCIESREQUEST']._serialized_start=1715
+  _globals['_DEPENDENCIESREQUEST']._serialized_end=1814
+  _globals['_DEPENDENCIESRESPONSE']._serialized_start=1816
+  _globals['_DEPENDENCIESRESPONSE']._serialized_end=1864
+  _globals['_BUILDCONTEXT']._serialized_start=1867
+  _globals['_BUILDCONTEXT']._serialized_end=2097
+  _globals['_BUILDCONTEXTUPDATEDREQUEST']._serialized_start=2099
+  _globals['_BUILDCONTEXTUPDATEDREQUEST']._serialized_end=2204
+  _globals['_BUILDCONTEXTUPDATEDRESPONSE']._serialized_start=2206
+  _globals['_BUILDCONTEXTUPDATEDRESPONSE']._serialized_end=2235
+  _globals['_ERROR']._serialized_start=2238
+  _globals['_ERROR']._serialized_end=2543
+  _globals['_ERROR_ERRORLEVEL']._serialized_start=2456
+  _globals['_ERROR_ERRORLEVEL']._serialized_end=2499
+  _globals['_ERROR_ERRORTYPE']._serialized_start=2501
+  _globals['_ERROR_ERRORTYPE']._serialized_end=2535
+  _globals['_POSITION']._serialized_start=2545
+  _globals['_POSITION']._serialized_end=2667
+  _globals['_ERRORLIST']._serialized_start=2669
+  _globals['_ERRORLIST']._serialized_end=2738
+  _globals['_BUILDREQUEST']._serialized_start=2741
+  _globals['_BUILDREQUEST']._serialized_end=2952
+  _globals['_AUTOREBUILDSTARTED']._serialized_start=2954
+  _globals['_AUTOREBUILDSTARTED']._serialized_end=3005
+  _globals['_BUILDSUCCESS']._serialized_start=3008
+  _globals['_BUILDSUCCESS']._serialized_end=3338
+  _globals['_BUILDFAILURE']._serialized_start=3341
+  _globals['_BUILDFAILURE']._serialized_end=3555
+  _globals['_BUILDEVENT']._serialized_start=3558
+  _globals['_BUILDEVENT']._serialized_end=3838
+  _globals['_GENERATESTUBSREQUEST']._serialized_start=3841
+  _globals['_GENERATESTUBSREQUEST']._serialized_end=4137
+  _globals['_GENERATESTUBSRESPONSE']._serialized_start=4139
+  _globals['_GENERATESTUBSRESPONSE']._serialized_end=4162
+  _globals['_SYNCSTUBREFERENCESREQUEST']._serialized_start=4165
+  _globals['_SYNCSTUBREFERENCESREQUEST']._serialized_end=4327
+  _globals['_SYNCSTUBREFERENCESRESPONSE']._serialized_start=4329
+  _globals['_SYNCSTUBREFERENCESRESPONSE']._serialized_end=4357
+  _globals['_LANGUAGESERVICE']._serialized_start=4360
+  _globals['_LANGUAGESERVICE']._serialized_end=5432
 # @@protoc_insertion_point(module_scope)
diff --git a/python-runtime/ftl/src/ftl/protos/xyz/block/ftl/v1/language/language_pb2.pyi b/python-runtime/ftl/src/ftl/protos/xyz/block/ftl/v1/language/language_pb2.pyi
index c9faae24f2..f40b027293 100644
--- a/python-runtime/ftl/src/ftl/protos/xyz/block/ftl/v1/language/language_pb2.pyi
+++ b/python-runtime/ftl/src/ftl/protos/xyz/block/ftl/v1/language/language_pb2.pyi
@@ -10,12 +10,13 @@ from typing import ClassVar as _ClassVar, Iterable as _Iterable, Mapping as _Map
 DESCRIPTOR: _descriptor.FileDescriptor
 
 class ModuleConfig(_message.Message):
-    __slots__ = ("name", "dir", "language", "deploy_dir", "build", "build_lock", "generated_schema_dir", "watch", "language_config")
+    __slots__ = ("name", "dir", "language", "deploy_dir", "build", "devModeBuild", "build_lock", "generated_schema_dir", "watch", "language_config")
     NAME_FIELD_NUMBER: _ClassVar[int]
     DIR_FIELD_NUMBER: _ClassVar[int]
     LANGUAGE_FIELD_NUMBER: _ClassVar[int]
     DEPLOY_DIR_FIELD_NUMBER: _ClassVar[int]
     BUILD_FIELD_NUMBER: _ClassVar[int]
+    DEVMODEBUILD_FIELD_NUMBER: _ClassVar[int]
     BUILD_LOCK_FIELD_NUMBER: _ClassVar[int]
     GENERATED_SCHEMA_DIR_FIELD_NUMBER: _ClassVar[int]
     WATCH_FIELD_NUMBER: _ClassVar[int]
@@ -25,11 +26,12 @@ class ModuleConfig(_message.Message):
     language: str
     deploy_dir: str
     build: str
+    devModeBuild: str
     build_lock: str
     generated_schema_dir: str
     watch: _containers.RepeatedScalarFieldContainer[str]
     language_config: _struct_pb2.Struct
-    def __init__(self, name: _Optional[str] = ..., dir: _Optional[str] = ..., language: _Optional[str] = ..., deploy_dir: _Optional[str] = ..., build: _Optional[str] = ..., build_lock: _Optional[str] = ..., generated_schema_dir: _Optional[str] = ..., watch: _Optional[_Iterable[str]] = ..., language_config: _Optional[_Union[_struct_pb2.Struct, _Mapping]] = ...) -> None: ...
+    def __init__(self, name: _Optional[str] = ..., dir: _Optional[str] = ..., language: _Optional[str] = ..., deploy_dir: _Optional[str] = ..., build: _Optional[str] = ..., devModeBuild: _Optional[str] = ..., build_lock: _Optional[str] = ..., generated_schema_dir: _Optional[str] = ..., watch: _Optional[_Iterable[str]] = ..., language_config: _Optional[_Union[_struct_pb2.Struct, _Mapping]] = ...) -> None: ...
 
 class ProjectConfig(_message.Message):
     __slots__ = ("dir", "name", "no_git", "hermit")
@@ -93,20 +95,22 @@ class ModuleConfigDefaultsRequest(_message.Message):
     def __init__(self, dir: _Optional[str] = ...) -> None: ...
 
 class ModuleConfigDefaultsResponse(_message.Message):
-    __slots__ = ("deploy_dir", "build", "build_lock", "generated_schema_dir", "watch", "language_config")
+    __slots__ = ("deploy_dir", "build", "devModeBuild", "build_lock", "generated_schema_dir", "watch", "language_config")
     DEPLOY_DIR_FIELD_NUMBER: _ClassVar[int]
     BUILD_FIELD_NUMBER: _ClassVar[int]
+    DEVMODEBUILD_FIELD_NUMBER: _ClassVar[int]
     BUILD_LOCK_FIELD_NUMBER: _ClassVar[int]
     GENERATED_SCHEMA_DIR_FIELD_NUMBER: _ClassVar[int]
     WATCH_FIELD_NUMBER: _ClassVar[int]
     LANGUAGE_CONFIG_FIELD_NUMBER: _ClassVar[int]
     deploy_dir: str
     build: str
+    devModeBuild: str
     build_lock: str
     generated_schema_dir: str
     watch: _containers.RepeatedScalarFieldContainer[str]
     language_config: _struct_pb2.Struct
-    def __init__(self, deploy_dir: _Optional[str] = ..., build: _Optional[str] = ..., build_lock: _Optional[str] = ..., generated_schema_dir: _Optional[str] = ..., watch: _Optional[_Iterable[str]] = ..., language_config: _Optional[_Union[_struct_pb2.Struct, _Mapping]] = ...) -> None: ...
+    def __init__(self, deploy_dir: _Optional[str] = ..., build: _Optional[str] = ..., devModeBuild: _Optional[str] = ..., build_lock: _Optional[str] = ..., generated_schema_dir: _Optional[str] = ..., watch: _Optional[_Iterable[str]] = ..., language_config: _Optional[_Union[_struct_pb2.Struct, _Mapping]] = ...) -> None: ...
 
 class DependenciesRequest(_message.Message):
     __slots__ = ("module_config",)
@@ -207,18 +211,22 @@ class AutoRebuildStarted(_message.Message):
     def __init__(self, context_id: _Optional[str] = ...) -> None: ...
 
 class BuildSuccess(_message.Message):
-    __slots__ = ("context_id", "is_automatic_rebuild", "module", "deploy", "errors")
+    __slots__ = ("context_id", "is_automatic_rebuild", "module", "deploy", "docker_image", "errors", "dev_endpoint")
     CONTEXT_ID_FIELD_NUMBER: _ClassVar[int]
     IS_AUTOMATIC_REBUILD_FIELD_NUMBER: _ClassVar[int]
     MODULE_FIELD_NUMBER: _ClassVar[int]
     DEPLOY_FIELD_NUMBER: _ClassVar[int]
+    DOCKER_IMAGE_FIELD_NUMBER: _ClassVar[int]
     ERRORS_FIELD_NUMBER: _ClassVar[int]
+    DEV_ENDPOINT_FIELD_NUMBER: _ClassVar[int]
     context_id: str
     is_automatic_rebuild: bool
     module: _schema_pb2.Module
     deploy: _containers.RepeatedScalarFieldContainer[str]
+    docker_image: str
     errors: ErrorList
-    def __init__(self, context_id: _Optional[str] = ..., is_automatic_rebuild: bool = ..., module: _Optional[_Union[_schema_pb2.Module, _Mapping]] = ..., deploy: _Optional[_Iterable[str]] = ..., errors: _Optional[_Union[ErrorList, _Mapping]] = ...) -> None: ...
+    dev_endpoint: str
+    def __init__(self, context_id: _Optional[str] = ..., is_automatic_rebuild: bool = ..., module: _Optional[_Union[_schema_pb2.Module, _Mapping]] = ..., deploy: _Optional[_Iterable[str]] = ..., docker_image: _Optional[str] = ..., errors: _Optional[_Union[ErrorList, _Mapping]] = ..., dev_endpoint: _Optional[str] = ...) -> None: ...
 
 class BuildFailure(_message.Message):
     __slots__ = ("context_id", "is_automatic_rebuild", "errors", "invalidate_dependencies")