Custom HIIT Architecture: Professional Interval Training App

Standard timers are too simple for serious training (Tabata/EMOM) or fail to run reliably in the background, ruining workouts. I needed to build a "Set and Forget" tool that handles complex timing sequences without draining battery or losing sync.

I engineered a "Session Logic Core" that calculates precise start/stop timestamps rather than relying on standard intervals (which drift). I built a custom UI component library for the circular progress indicators and "Active State" cards (Work vs. Rest visibility).

A 5-star quality utility app that handles complex workout structures with zero latency. The app currently supports global users with a scalable codebase ready for new feature modules (Voice Coaching/Apple Watch sync).

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