E-Learning App in android

I am looking for a skilled Android developer to create an e-learning app specifically designed for teenagers. The app will focus on interactive quizzes to engage and test the knowledge of the users.

Features to include:
- Interactive quizzes that provide immediate feedback and explanations
- Progress tracking to allow users to see their improvement over time

The ideal candidate should have experience in developing Android apps and be familiar with integrating interactive elements and progress tracking features. Additionally, knowledge of educational app development and designing user-friendly interfaces is a plus.

Please note that the specific subjects or topics for the e-learning app will be provided by the client.