Android Earning App Development

I need an experienced Android app developer to create an earning app focused on watching ads.

Key Requirements:
- Users can earn money by watching ads.
- User-friendly interface.
- Secure and efficient payment system.
- User profile management.
- Ads integration and tracking.

Ideal Skills:
- Android app development expertise.
- Experience with ad integration.
- Strong UI/UX design skills.
- Familiarity with secure payment gateways.
- Good understanding of user engagement metrics.

Please provide examples of similar work.