Custom HIIT Architecture: Professional Interval Training App by Othmane ZaouteCustom HIIT Architecture: Professional Interval Training App by Othmane Zaoute

Custom HIIT Architecture: Professional Interval Training App

Othmane Zaoute

iOS Developer

Mobile Engineer

React Native Developer

Expo

React Native

RevenueCat

Problem:

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.

Solution:

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).

Outcome:

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).

Click 'Get in Touch' to discuss your mobile architecture. I reply to all inquiries within 24 hours.

Like this project

Posted Feb 13, 2026

Engineered a precision HIIT/Tabata timer with millisecond-perfect background sync. Built with React Native & Expo, featuring RevenueCat subscriptions.

Likes