Educational App for Adults

I'm seeking an experienced mobile app developer to create an educational app aimed at adults. The app will primarily focus on delivering academic courses.

Key Requirements:
- User-friendly interface
- Secure user authentication and data protection
- Integration of multimedia content (videos, quizzes, etc.)
- Progress tracking and reporting features
- Ability to enroll in and manage courses

Ideal Skills and Experience:
- Proven experience in developing educational mobile apps
- Strong knowledge of UX/UI design principles
- Expertise in backend development and database management
- Familiarity with multimedia integration and progress tracking systems
- Strong communication skills for regular updates

Please provide a portfolio showcasing similar projects and an estimated timeline for completion.