Pulse Tracker
Cross-platform health companion with offline sync, push reminders, and native biometrics.
- Type
- Mobile
- Status
- Live
- Role
- Mobile Engineer
- Duration
- 2023-09 → 2024-12
Overview
A mobile vessel requires a native shell, UI layer, data sync, push comms, offline cache, and store bridge — each tuned for reliable daily use on iOS and Android.
Key metrics
Downloads
85k
Rating
4.7★
Crash-free
99.4%
App size
42MB
Engineering highlight
Offline queue duplicate entries on reconnect
Fixed duplicate daily logs by adding idempotent upload keys and debounced sync on network restore.
Links
Timeline
Each bar marks a documented milestone or decision.
More notes
HealthKit background delivery integration
Shipped passive step and heart-rate import on iOS with user-granted permissions and fallback manual entry.
Featured module
Native Shell
Expo-managed native shell with OTA updates, deep links, and platform-specific navigation.
Summary
Cross-platform health companion with offline sync, push reminders, and native biometrics.
Architecture
- Native ShellFeatured
Expo-managed native shell with OTA updates, deep links, and platform-specific navigation.
ExpoReact NativeReact Navigation - UI Layer
Accessible component library with dark mode, haptics, and adaptive layouts for phone and tablet.
React NativeReanimatedTailwind RN - Data Sync
Background sync with conflict resolution between local SQLite and cloud Firestore.
SQLiteFirestoreTanStack Query - Push / Comms
Scheduled reminders, streak alerts, and silent sync triggers via FCM and APNs.
FCMAPNsExpo Notifications - Offline Cache
Full offline read/write for daily logs with queue-based upload on reconnect.
SQLiteMMKVNetInfo - Store Bridge
App Store and Play Store release pipeline with staged rollouts and crash reporting.
EAS BuildTestFlightSentry