Custom Android Lottery App Development

I need a customized lottery app for Android with admin panel. The primary feature is user registration and login. Additionally, I want to include:
- Push notifications
- Payment integration
- User profile management

Ideal skills and experience:
- Experience in Android app development
- Strong background in implementing secure payment systems
- Knowledge in building scalable user management systems
- Familiarity with push notification services
- Prior experience with admin panel development