Multi-Role EdTech App Development

I'm seeking a skilled developer to create a web and mobile app (iOS and Android) for a mentorship-based educational platform.

The app will cater to multiple user roles:
- Students
- Teachers
- Administrators
- Mentors
- Parents

Ideal candidates should have experience in:
- Developing cross-platform mobile applications
- Building comprehensive web applications
- Designing user-friendly interfaces for multiple user roles
- Implementing secure and scalable back-end systems
- Experience in EdTech or similar domains is a plus

Please provide examples of past work and relevant experience.