diff --git a/engine/src/flutter/shell/platform/embedder/embedder.cc b/engine/src/flutter/shell/platform/embedder/embedder.cc
index 807ebe772b7..512f1183153 100644
--- a/engine/src/flutter/shell/platform/embedder/embedder.cc
+++ b/engine/src/flutter/shell/platform/embedder/embedder.cc
@@ -361,6 +361,13 @@ FlutterEngineResult FlutterEngineRun(size_t version,
   settings.task_observer_remove = [](intptr_t key) {
     fml::MessageLoop::GetCurrent().RemoveTaskObserver(key);
   };
+  if (SAFE_ACCESS(args, root_isolate_create_callback, nullptr) != nullptr) {
+    VoidCallback callback =
+        SAFE_ACCESS(args, root_isolate_create_callback, nullptr);
+    settings.root_isolate_create_callback = [callback, user_data]() {
+      callback(user_data);
+    };
+  }
 
   // Create a thread host with the current thread as the platform thread and all
   // other threads managed.
diff --git a/engine/src/flutter/shell/platform/embedder/embedder.h b/engine/src/flutter/shell/platform/embedder/embedder.h
index c2cc35669ca..e0603644f44 100644
--- a/engine/src/flutter/shell/platform/embedder/embedder.h
+++ b/engine/src/flutter/shell/platform/embedder/embedder.h
@@ -251,6 +251,9 @@ typedef struct {
   const uint8_t* isolate_snapshot_instructions;
   // The size of the isolate snapshot instructions buffer.
   size_t isolate_snapshot_instructions_size;
+  // The callback invoked by the engine in root isolate scope. Called
+  // immediately after the root isolate has been created and marked runnable.
+  VoidCallback root_isolate_create_callback;
 } FlutterProjectArgs;
 
 FLUTTER_EXPORT
diff --git a/engine/src/flutter/shell/platform/embedder/tests/embedder_unittests.cc b/engine/src/flutter/shell/platform/embedder/tests/embedder_unittests.cc
index e2062f6ee95..7ddff1e96aa 100644
--- a/engine/src/flutter/shell/platform/embedder/tests/embedder_unittests.cc
+++ b/engine/src/flutter/shell/platform/embedder/tests/embedder_unittests.cc
@@ -29,10 +29,16 @@ TEST(EmbedderTest, CanLaunchAndShutdownWithValidProjectArgs) {
   FlutterProjectArgs args = {};
   args.struct_size = sizeof(FlutterProjectArgs);
   args.assets_path = testing::GetFixturesPath();
+  args.root_isolate_create_callback = [](void* data) {
+    std::string str_data = reinterpret_cast<char*>(data);
+    ASSERT_EQ(str_data, "Data");
+  };
 
+  std::string str_data = "Data";
+  void* user_data = const_cast<char*>(str_data.c_str());
   FlutterEngine engine = nullptr;
   FlutterEngineResult result = FlutterEngineRun(FLUTTER_ENGINE_VERSION, &config,
-                                                &args, nullptr, &engine);
+                                                &args, user_data, &engine);
   ASSERT_EQ(result, FlutterEngineResult::kSuccess);
 
   result = FlutterEngineShutdown(engine);