Bumplink

Bumplink reimagines how people exchange contact information by making it bilateral, visual, and memorable. When two users meet, one generates a QR code containing their contact preset. After scanning, both users see a preview and must approve the exchange before continuing. The app then opens the camera for a selfie together, creating a memorable association with the new contact. Built with React Native (Expo) for cross-platform mobile and Rails 8 API with Action Cable for real-time WebSocket coordination.

• • Real-time bilateral coordination via WebSockets between two mobile devices
• • QR code generation with embedded contact preset data
• • Managing exchange session lifecycle with 10-minute expiration
• • Camera integration for shared selfies during the exchange flow
• • Cross-platform mobile development (iOS & Android) with Expo
• • Secure session management with token-based API authentication

• • React Native with Expo Router file-based navigation
• • Rails 8 Solid stack (solid_cache, solid_queue, solid_cable)
• • Action Cable for real-time WebSocket communication from mobile clients
• • QR code bilateral exchange patterns and UX flows
• • Mobile camera and image handling with expo-camera and expo-image-picker
• • Cross-platform mobile development targeting iOS and Android
• • Stateful session management with real-time coordination