Multi-Platform Travel Booking App

I need a comprehensive travel booking application that works on iOS, Android, and the Web. The app should allow users to book hotels, rent cars, and book tours.

Key Requirements:
- Platforms: iOS, Android, Web
- Services: Hotel bookings, car rentals, tour bookings
- User Authentication: Flexible options (email/password, social media, phone verification)

Ideal Skills:
- Experience in developing cross-platform applications
- Proficiency in UI/UX design for a seamless user experience
- Strong backend development skills to handle bookings and user data securely
- Familiarity with integrating third-party APIs for travel services
- Knowledge of implementing various user authentication methods

Please provide a portfolio with similar projects and your approach to this development. Looking forward to your bids!