Multi-Portal School Management App Development

I need a comprehensive school management system for iOS and Android. The app should have an admin dashboard, teacher portal, and parents portal.

Essential functionalities include:
- Student and staff management
- Attendance tracking
- Grade reporting

Real-time notifications are needed for all users.

Ideal skills and experience:
- Mobile app development (iOS and Android)
- Experience with school management systems
- Backend development for real-time data processing
- UI/UX design for intuitive multi-user interfaces
- Knowledge in database management

Please provide examples of similar work done.