Health & Fitness App Development

Cross-Platform Health & Fitness Tracking App (iOS + Android)

I'm looking for an experienced mobile app developer or small team to build a modern health tracking application for both iOS and Android.

The app should collect wellness and activity data from supported phone sensors and wearable devices, then present it through a clean, easy-to-use interface focused on daily health insights.

Main Features

- Daily step tracking
- Heart rate synchronization
- Sleep monitoring and history
- Blood oxygen (SpO2) support
- Blood pressure synchronization from compatible devices
- Calories burned and activity summary
- Walking, running, and workout statistics
- Daily, weekly, and monthly health reports
- Personalized dashboard with health metrics
- Push notifications for goals and reminders

Device Integration

The application should integrate with native health platforms where appropriate, including:

- Apple Health / HealthKit
- Google Health Connect (or Google Fit where applicable)
- Compatible Bluetooth-enabled wearable devices

Data should synchronize reliably and refresh automatically whenever new health information becomes available.

UI / UX

I already have rough wireframes and feature ideas.

I'm looking for someone who can create a polished, modern interface that feels native on both iOS and Android. The application should be simple enough for first-time users while remaining visually appealing.

Internationalization
The app should be built with localization in mind.

Initial languages:
- English
- Spanish

All UI text should use a standard localization framework so additional languages can be added without changing application logic.

Technical Expectations
- Cross-platform development using Flutter or React Native
- Clean, maintainable architecture
- Well-documented source code
- Secure handling of health-related data
- Optimized performance and battery usage
- Responsive layouts for phones and tablets

Deliverables
- Production-ready Android and iOS applications
- Complete source code
- Build and deployment documentation
- Documentation for wearable integrations
- Instructions for adding additional languages
- Assistance with resolving store submission issues if necessary

Ideal Experience
- Please include examples of previous mobile health, fitness, wellness, or wearable integration projects.
- Experience with HealthKit, Health Connect, Bluetooth device integration, and real-time sensor synchronization is highly preferred.

My budget is fixed at $150, so please bid only if you're comfortable working within this budget. Include your estimated timeline and relevant portfolio when applying.