Praypal: Geolocation Milestone Progression & Lifestyle Tracker
Built a lightweight, battery-efficient daily milestone tracker with offline astronomical coordinate calculation formulas and scheduled local notification alerts.
The Engineering Challenge
Calculating precise event times locally without relying on external web APIs, while guaranteeing background notification delivery across aggressive Android OEM battery savers.
What I Built & Delivered
Implemented mathematical solar positioning and timezone coordinate formulas in pure Dart, eliminating network API requirements.
Configured precise Android AlarmManager background notification triggers that respect device Doze Mode.
Engineered an ultra-clean OLED high-contrast dark theme with animated circular completion rings.
Architectural Highlights
Pure Dart Coordinate Computation
Mathematical coordinate calculation logic executing in microseconds with zero network overhead.
Exact Alarm Scheduling
Native Android exact alarm intent dispatchers ensuring pinpoint notification timing.
Engineering & Business Results
Extremely low memory footprint (<35MB RAM) and zero background battery drain.
100% accurate offline local notifications across hundreds of global timezones.
Maintained 4.9-star user rating on Google Play.
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