Cross-Platform Educational App Development

I'm looking for an experienced app developer to create a comprehensive educational application . This app should be available on Android, iOS, PC, and MacBook.

The app will feature:
- Quizzes and assessments to evaluate learning
- fetch quiz from my database
-three days free trial
- premium based without purchase do not enter app.
- admin page I can edit trial users, premium users
- Progress tracking to monitor user development

Ideal Skills and Experience:
- Proficiency in cross-platform app development
- Experience in creating educational apps
- Strong UI/UX design skills