Cross-platform Carpooling App Development

I'm looking for a seasoned app developer to create a mobile application similar to BlaBlaCar. The app should be available on both iOS and Android, and it needs to incorporate several key features and user roles.

Key Features:
- User Profiles and Ratings: Each user should have a profile and be able to rate others to ensure the safety and reliability of the service.
- Trip Scheduling and Booking: Users should be able to schedule trips and book seats in a car.
- In-app Messaging: A secure, private messaging system for users to communicate.
- Maps: Integrated maps for route planning and tracking.
- Payment: A secure, reliable payment system for transactions.

User Roles:
- Driver: Users who are offering rides.
- Passenger: Users who are looking for rides.
- Admin: A separate interface for administrative purposes.

Ideal Skills and Experience:
- Proven experience in mobile app development, particularly cross-platform.
- Familiarity with carpooling app features.
- Strong understanding of user interface and user experience design.
- Experience with secure payment integration.
- Ability to create a robust admin interface.