Marketplace App Development

I'm looking to develop a marketplace application similar to Facebook Marketplace for individual buyers and sellers. The app should be available on both iOS and Android platforms.

Key Features:
- User Profiles: Users should be able to create and manage their profiles.
- Chat System: A built-in chat system for users to communicate about listings.
- Payment Integration: Secure payment processing within the app.

Ideal Skills & Experience:
- Experience in mobile app development for both iOS and Android.
- Proficiency in building secure payment systems.
- Strong background in developing user-friendly chat interfaces.
- Prior experience with marketplace or social commerce apps is a plus.

Please provide portfolio and relevant experience with your bids.