Mobile Developer for Coffee Shop Order-Ahead App (iOS + Android)

I run a coffee shop and want a simple order-ahead mobile app. Customers browse the menu, customize a drink, choose a pickup time, and pay in the app. My staff need a simple order screen (tablet or web) that shows incoming orders in real time and lets them mark orders as ready. Scope for v1: - iOS and Android, built cross-platform (React Native) - In-app payment (Stripe or Square, with Apple Pay / Google Pay) - A merchant order screen for staff to receive and manage orders in real time Not in v1 (later phases): loyalty/rewards, multiple locations, delivery. Please propose a first paid milestone: the core order-and-pay flow as a working prototype I can test, before building the rest. I'd like to start small, review that milestone together, then expand. Definition of done for v1: a customer can place and pay for a customizable order and select a pickup time on both iOS and Android; staff receive the order on a live screen and can mark it ready; the app is submitted to both app stores.