diff --git a/examples/complex_project/core/__init__.py b/examples/complex_project/core/__init__.py
new file mode 100644
index 0000000..4b3da1d
--- /dev/null
+++ b/examples/complex_project/core/__init__.py
@@ -0,0 +1,25 @@
+"""Core application module."""
+
+from typing import Dict, Any
+from .config import AppConfig
+from .processor import DataProcessor
+
+
+class Application:
+    """Main application class."""
+
+    def __init__(self, config: AppConfig):
+        self.config = config
+        self.processor = DataProcessor(config)
+
+    def run(self) -> None:
+        """Run the application."""
+        self._log("Application starting...")
+
+        result = self.processor.process_data({"key": "value"})
+
+        self._log(f"Processing result: {result}")
+
+    def _log(self, message: str) -> None:
+        """Log a message."""
+        print(f"[App] {message}")