Cross-platform English Coaching App Developer

I need a skilled app developer to create a cross-platform English coaching app. The app will be targeted towards beginners, intermediate and advanced, so it needs to have a simple and intuitive user interface.

Key Requirements:
- Cross-platform development experience, particularly iOS and Android
- Previous experience developing educational or coaching apps
- Familiarity with beginner-level English teaching techniques

Please submit your proposals along with relevant work samples.