Math Learning App Development

I'm looking for an experienced mobile app developer to create a comprehensive Mathematics teaching application available on both iOS and Android platforms. The app will include:

- User Authentication:
- Log in via Google or Mobile OTP

- Content Delivery:
- Play YouTube videos based on user selection
- Downloadable questions and answers (both multiple choice and subjective)
- First two downloads free, thereafter subscription-based

- Admin Panel Features:
- User management
- Video content management
- Subscription management

Ideal Skills and Experience:
- Proficiency in mobile app development for both iOS and Android
- Experience with user authentication and integrating YouTube content
- Familiarity with subscription-based models and content download functionalities
- Strong backend development skills for a robust admin panel
- Prior experience in educational apps is a plus

Please provide samples of previous work and a detailed breakdown of your approach to this project.