All user data accessible without internet connection.
Bidirectional data synchronization with conflict resolution.
Daily battery consumption from background sync operations.
Designed for consistency
The app experience is intentionally calm: users can record small daily reflections, review their history, and build consistency without turning worship tracking into a complicated dashboard.
The Challenge
Building an offline-first app requires solving data synchronization without complex merge logic. Users need immediate write access to local storage while maintaining eventual consistency with cloud storage. The architecture must handle conflict resolution gracefully and minimize battery drain during background sync operations.
Approach
I implemented Room Database as the source of truth with migration to Firebase Firestore for authenticated users. The architecture follows MVVM with StateFlow for reactive updates and coroutines for non-blocking I/O. Jetpack Compose handles the UI layer with efficient recomposition, while a sync service manages background data reconciliation with minimal overhead.
The Impact
- Implemented Room schema with automatic migrations and type-safe queries, ensuring data integrity across app updates.
- Built Jetpack Compose UI with efficient state management, achieving smooth animations even on mid-range devices.
- Designed dual-mode authentication flow allowing offline usage without server dependency or account creation.
- Implemented bidirectional Firebase Firestore sync with timestamp-based conflict resolution and transparent user notifications.
Build notes
Implementation Highlights
Local-First Architecture
- Room Database for offline persistence
- SQLite queries and data synchronization
- Jetpack Compose for declarative UI
State Management
- ViewModel lifecycle management
- StateFlow for reactive data binding
- Firebase Firestore sync when authenticated
Mobile Optimization
- Battery-efficient background sync
- Minimal network usage
- Gesture-based navigation patterns
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A practical mobile habit tool with a resilient data layer.
The strongest part of this build is the balance between private offline use and cloud-backed continuity for users who want it.
Project Review
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RaafiHilmi
Mobile developer focused on Flutter, Android, API integration, and reliable app flows.