Mobile App Developer for Ride-Sharing

I'm looking for an experienced software developer to create a mobile application for a ride-sharing service similar to Namma Yatri or Ola. The app needs to be developed for both iOS and Android platforms.

Key Requirements:
- User-friendly interface for riders and drivers
- Real-time GPS tracking
- Secure payment integration
- Rating and feedback system
- Robust backend support for data management

Ideal Skills and Experience:
- Proven experience in mobile app development, particularly in the ride-sharing or transportation sector
- Strong knowledge of both iOS and Android development
- Expertise in integrating secure payment gateways
- Familiarity with real-time data processing and GPS technologies
- Ability to create scalable backend systems

Please provide a portfolio showcasing similar projects and an estimated timeline for completion.