I need a React Native application that lets staff mark attendance automatically through real-time GPS location tracking. The app should keep the position stream active in the background, push updates to a central endpoint the moment a device crosses the defined geofence, and show the current location on a simple map view so users can confirm they are being tracked correctly. Authentication will rely on biometric face recognition, ensuring only the authorised employee can start a tracking session. For delivery, I expect: • a clean, well-documented React Native codebase (Expo or bare React Native is fine) • background location service that meets both Android and iOS foreground + background policies • a small Node or Firebase demo endpoint so I can see the real-time feed arrive server-side • instructions to build, run, and test on physical devices Once I can install the APK/IPA, log in with the biometric prompt, watch the live location update remotely, and see that data persist after closing the app, the project is complete.