Android Utility App Development

I'm seeking an experienced Android app developer to create a utility/tool application. The app must include user authentication, data storage, and push notifications.

Key requirements:
- Develop for Android platform
- Implement secure user authentication
- Build robust data storage solutions
- Integrate push notifications

Ideal Skills and Experience:
- Proficiency in Android app development
- Experience with secure authentication methods
- Knowledge of data storage options (e.g., Firebase, SQLite)
- Familiarity with push notification services (e.g., Firebase Cloud Messaging)

Please provide examples of similar projects you've completed.