Android App Development

I'm looking for an experienced Android developer to create a mobile app. The app will require user authentication and push notifications.

Ideal skills and experience:
- Proficiency in Android development (Java/Kotlin)
- Experience with user authentication protocols (OAuth, Firebase Auth)
- Knowledge of implementing push notifications (Firebase Cloud Messaging)
- Strong background in mobile app security
- Ability to work within budget and meet deadlines

Please provide samples of previous work and estimated timelines.