Mobile 2026
GymApp
Production-Grade Mobile App
Built a comprehensive offline-first fitness tracking mobile application using React Native, Expo, and Firebase. The app features 505 exercises, 100+ integrated tools, custom workout creation, and progress analytics. Codebase spans 75,000+ lines with MMKV for high-performance storage (30x faster than AsyncStorage).
505
Exercises
100+
Tools
96.4%
Test Coverage
30x Faster
Storage Speed
01
The Challenge
Needed to create a production-ready mobile app with complex state management, offline-first capabilities, and high-performance data persistence.
02
The Solution
Developed using React Native with Expo, Firebase for backend integration, and MMKV for ultra-fast offline storage.
Technology Stack
React Native
JavaScript
Expo
Firebase
MMKV
Jest
React Testing Library
03
Architecture
- Component-based architecture
- Type-safe state management
- High-performance storage with MMKV
- Offline-first data persistence
- Modular feature structure
- Comprehensive unit testing
04
Key Features
01
505 exercises with detailed instructions 02
100+ fitness tools 03
Custom workout creation and scheduling 04
Progress tracking with charts and analytics 05
MMKV storage (30x faster than AsyncStorage) 06
Offline-first architecture 07
Social features (share workouts, challenges) 08
Rest timer with notifications 09
Body measurements tracking 10
CI/CD pipeline with GitHub Actions 05
Results & Impact
- Published open-source project with 12+ GitHub stars
- Achieved 96.4% test coverage with 1,459 tests
- Included 505 exercises and 100+ tools
- Implemented MMKV storage, running 30x faster than traditional async storage