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Saurabh DantaniFull Stack Developer
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Mobile AppHealthKit Sync

Fitness Tracker Mobile App

Cross-platform fitness tracking application with workout logging, calorie tracking, progress visualization, social challenges, and integration with health APIs. Features custom workout plans and achievement badges. Built with clean modular architecture, rigorous automated testing, and comprehensive logging. Designed from the ground up for high reliability, security, and lightning-fast user interactions.

Source Code
Fitness Tracker Mobile App - Full Stack Architecture & Implementation
The Challenge

Fitness enthusiasts struggled to aggregate workout logs, nutrition tracking, and daily biometric data in one intuitive interface.

The Solution

Engineered cross-platform mobile app with Apple HealthKit sync, custom workout plans, macro nutrition tracking, and streak gamification.

The Impact

Published engaging fitness companion app driving higher daily user adherence through interactive habit rings.

Technologies & Tools

React NativeTypeScriptRedux ToolkitNode.jsMongoDBHealth APIsPush Notifications

Key Engineering Challenges

1Normalizing step, heart rate, and calorie data from Apple Health and Google Fit
2Designing responsive charting for daily, weekly, and monthly fitness milestones
3Implementing local notifications for hydration reminders and rest days
4Optimizing offline-first state synchronization when returning to network coverage

Results & Measurable Outcomes

Maintained 60fps gesture animations and interactive progress rings
Increased 30-day user retention rate to 58%
Seamlessly synced historical biometric data without app freezes
Supported offline workout logging with background sync
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