Engaging E-Learning App for Kids

I'm looking for an experienced mobile app developer to create an engaging e-learning application for children aged 9-12. The app should be mobile-friendly and cover Math, Science, and Language Arts.

Key features include:
- Quizzes
- Interactive games
- Video tutorials

Ideal candidates should have:
- Proven experience in developing educational apps
- Strong skills in mobile app design and development
- Knowledge of child-friendly UI/UX principles
- Ability to create engaging and interactive content

Please provide samples of similar work and a detailed project plan.