Ride-Sharing App Development

I need a complete ride-sharing mobile application similar to Uber or Careem for both iOS and Android, along with a web-based admin dashboard.

The app should include two separate interfaces:
- Customer interface (to request rides)
- Driver interface (to accept rides)

Key features include:
- Real-time GPS tracking
- In-app chat and call
- Payment integration (credit card)
- Ride history
- Ratings and reviews

Admin panel to manage users, drivers, and trips, with additional features:
- Reporting and analytics
- Driver payment management
- Promotions and discounts management

I am looking for a developer or team with experience in building similar apps. Please share your portfolio, estimated timeline, and cost.

Ideal skills and experience:
- Mobile app development (iOS and Android)
- Experience with real-time GPS and payment integration
- Strong UI/UX design skills (modern and sleek style)
- Backend development for complex admin dashboards
- Proven portfolio of similar projects