Private Android Trading Education App Development

I'm looking for a seasoned Android app developer to create a secure and private trading education application. The app should include:
- Video tutorials: Comprehensive, engaging and easy to understand.
- Live chat support: To provide real-time assistance and foster interaction.
- Interactive quizzes: To reinforce learning and maintain user engagement.

The ideal candidate should have:
- Proven experience in Android app development.
- Prior experience in creating educational apps would be a plus.
- Excellent understanding of trading concepts.
- Strong skills in implementing secure and private features in an app.

The primary audience for this app has not been specified yet, but the app should cater to a wide range of trading skill levels. Therefore, the video tutorials and quizzes should be scalable and customizable according to the user's progress. Please provide examples of your previous work that aligns with this project.