React Native Marketplace with Payment System

We're launching a B2C marketplace and looking for a mobile app that works on both iOS and Android from a single React Native codebase. The product concept is straightforward: a user posts a listing, finds offers from other people, communicates with the seller directly, and makes a payment without leaving the app. For us, trust isn't an abstraction but the foundation of the mechanics, so payments should use an escrow scheme rather than simple deduction: the buyer's money is held until the deal is confirmed and only then goes to the seller, protecting both sides.

We already have a clear vision of the user journey and a backend team ready to work in sync, but it's important to us to find a developer who has actually shipped marketplaces, not built prototypes. We understand the difference between an app that runs on an emulator and one that passes App Store and Google Play review and stably operates for real users. Real-time chat, reliable push delivery via FCM, and transparent seller payouts — these determine the fate of such a product, and we scrutinize them more than a pretty loading screen.

If you've done something similar, tell us about an app you brought to the stores and how the payment part was structured. Below is the specific scope of work.

Screens and functionality
— Onboarding: Google, Apple, email sign-up
— Feed: categories, search, sort by price and date
— Listing page: 10 photos, description, seller profile, reviews
— Chat: real-time messaging via Firebase
— Payments: Stripe (escrow scheme)
— Push notifications: FCM — messages, order status
— Seller account: manage listings, analytics, payouts
— Admin web panel: users, disputes, reports

Stack requirements
— React Native (Expo or bare workflow)
— Node.js + PostgreSQL
— Stripe Connect
— Firebase (chat + push)
— Publishing to App Store and Google Play

Deliverables
— Source code in private GitHub repository
— Production builds for both platforms
— API documentation
— Deployment guide