I need an Android application that brings every daily duty of a security guard into one place. The app must be modular so we can switch features on or off as sites require them, but the patrol-tracking module is non-negotiable. Patrol Tracking – mandatory • Real-time GPS tracking • Scheduled patrol routes • Checkpoint scanning (QR / NFC or similar) Beyond patrols I also want incident reporting, visitor handling, and any other practical “guard tools” you already have experience with; the goal is to reduce paper logs completely. Each module should share the same login and database so guards never juggle multiple apps. Please build natively for Android, use reliable location libraries (Google Maps, Fused Location Provider, etc.) and follow current Play Store requirements. When you reply let me know: • Which comparable apps you have shipped • Your preferred tech stack and why • How you handle offline data sync for spotty site coverage Deliverables are the full Android Studio project, signed APK for testing, and a short admin guide so my in-house team can configure sites, guards, and routes without coding.