Cross-Platform Marketplace App Development

I’m ready to turn a peer-to-peer marketplace concept into a fully functional app on both iOS and Android. The core experience must support:

• User profiles with ratings and reviews
• Real-time in-app messaging between buyers and sellers
• Secure payment gateway integration (nothing but a digital wallet will be available now via a special API)
• Bidding or offer submission on listings
• Simple data-input screens for posting items or services
• Map integration so users can browse, filter and navigate by location

Here’s how I picture the project flow:

1. Product definition & wireframes – validating user journeys and nailing down edge cases.
2. UI/UX design – modern, accessible layouts in line with App Store / Google Play guidelines.
3. Cross-platform development – one codebase (React Native, Flutter, or your proven stack) compiled for both platforms.
4. Backend & database – scalable APIs, user auth, notification service, payments and real-time chat.
5. QA & iteration – testflight / closed beta, bug fixing, performance tuning.
6. Store launches & handover – submission, store assets, final repo, and deployment docs.

Acceptance criteria
• Both apps install cleanly on latest iOS and Android versions.
• All six features above work end-to-end, including payment in sandbox and live modes.
• Full source code, documentation, and one-hour hand-off walk-through.

If this scope matches your skill set, let’s discuss timelines, milestones, and any creative input you’d like to bring.