Pinmate

We designed the app around the game invitation as the atomic unit. An invite shows everything a golfer weighs before committing: who's hosting and their handicap and round count, who else has joined, the course with its rating and price range, and the forecast - accept or ignore in one tap. Course pages pair the venue with the players who'll be on it, so compatibility is visible before the first tee.

Booking closes the loop in one screen: tee time, course, phone, saved payment method, book. The checkout flow was designed against a simple enemy - every extra step is a golfer who calls the pro shop instead.

The suggested architecture uses React Native with Expo and Expo Router for cross-platform development. Firebase provides the real-time infrastructure: Cloud Firestore for games, profiles, and per-game chat via real-time listeners, Cloud Messaging for push notifications when invites and messages arrive, and Firebase Authentication for account management. Stripe handles course payments with saved methods.

Google Maps API with geolocation handles the where - distances to courses, member locations, and travel filtering. Zustand manages local app state while TanStack Query keeps games and availability in sync. The Pinmates friend graph feeds it all: invite friends from contacts or socials, and the people you actually play with get surfaced first when you create a game.