Comprehensive Property and Vehicle Listing App

I'm looking to create a mobile app that equally focuses on both property and vehicle listings. The app will feature:

Property Listings:
- Residential, commercial, and land options

Vehicle Listings:
- Cars, motorcycles, and trucks

Ideal skills and experience:
- Mobile app development (iOS and Android)
- Experience with property and vehicle listing platforms
- User-friendly UI/UX design
- Strong backend development skills to manage extensive databases
- Familiarity with secure payment gateways and user authentication

Please provide examples of similar work done and your approach to this project.