Mobile Coffee Ordering App Build

We are looking for an experienced mobile app developer or development team to build a custom digital wallet application for our business.
This is not a generic e-commerce app. The core of the project is a closed-loop wallet system where customers can preload money, pay in-store using QR code, and earn rewards as they spend.
Project Overview
The application will allow users to:
Create an account and manage their profile
Load money into their in-app wallet (via iyzico or similar payment gateway)
View wallet balance and transaction history
Pay in-store using a QR code
Earn rewards / cashback based on spending
View our menu and business information
In a later phase, we plan to add in-app ordering functionality, so the architecture should be scalable.
Core Features (MVP)
User Side
Registration & login
Secure wallet balance system
Payment top-up via Stripe (or similar PCI-compliant provider)
QR-based in-store payment
Loyalty / rewards logic (e.g. spend-to-earn model)
Transaction history
Menu display
Business information section
Admin Panel (Web Preferred)
View users and wallet balances
Monitor transactions
Adjust reward rates / campaigns
Manage menu items
Basic reporting dashboard
Technical Preferences
We are open to recommendations, but preferred stack:
Flutter or React Native (cross-platform)
Firebase / AWS or scalable backend solution
Stripe integration
Secure QR code implementation
Security and data integrity are extremely important. No sensitive payment data should be stored locally.
Deliverables
Fully functional iOS and Android builds ready for store submission
Complete source code
Admin panel connected to the same backend
Documentation for setup and deployment
Post-launch support for initial release fixes
Requirements
Please only apply if you have experience with:
Wallet systems, fintech, or payment integrations
Real-time database architecture
Secure transaction handling
App Store and Google Play submission process
When applying, include:
Examples of similar apps you’ve built
Your proposed tech stack
Estimated timeline
Budget range
We are looking for a long-term partner, not just a quick build.
If you'd like, I can also prepare:
A shorter version (to attract more bids)
A higher-budget / enterprise-level version
A version written to attract lower-cost but capable teams
Or a version optimized specifically for US / EU developers
Let me know your target developer profile.