Freelance iOS & Node.js Developer
Collaborating with clients on native iOS and backend Node.js projects, including long-term engineering on Strong Workout Tracker, one of the most popular fitness tracking apps on the App Store.
- Contributed to the major codebase refactoring adopting SwiftUI and Combine, leading to the release of Strong 6.0.
- Implemented and shipped the Live Activity and Dynamic Island feature displaying active rest timers on the Lock Screen and Dynamic Island.
- Improved the xRM (x Repetition Maximum) estimation formula by adding support for both Brzycki and Epley formulas across Personal Records, Charts, and analytics.
- Enhanced Exercise List filters, sorting methods, and caching to improve loading performance, and helped develop fuzzy search with real-time character highlighting.
- Developed customizable themes, alternate app icons, local database diagnostic tools, and GDPR / Apple Privacy Nutrition Label compliance.