iOS Developer - Fitness App with BLE Wearable Integration (React Native)

I'm building a fitness tracking app and need help with the iOS side, specifically the integration with wearable devices. What's needed: - Connect the app to BLE fitness trackers and heart rate monitors (pairing, reconnect, background sync) - Read and process workout data - heart rate, steps, session duration Sync data with HealthKit - Handle background modes properly so tracking doesn't drop when the app is minimized The app is React Native with native modules where needed. iOS is the priority - Android comes later. Looking for someone with real experience in BLE on iOS, since that's where most of the tricky parts are. If the first phase goes well, there's more work after. Please include in your reply: - A fitness or health app you've worked on - Your experience with CoreBluetooth / BLE on iOS - Availability per week