Smart Fitness Watch Development

I need a smart fitness watch with essential health tracking capabilities, built-in GPS, and workout tracking modes. It should sync seamlessly with Android devices and support notifications for calls, texts, and apps.

Key Requirements:
- Health Tracking: Steps, heart rate, calories, and sleep.
- GPS & Workout Modes: Various workout tracking modes.
- Android Sync: Must sync with Android devices.
- Notifications: Calls, texts, and app alerts.
- Customizable Design: Interchangeable bands and sleek appearance.
- Water-resistant: Up to 50 meters.
- Battery Life: 7-day battery life with fast charging.

Ideal Skills & Experience:
- Experience with wearable technology development.
- Proficiency in mobile app integration, especially with Android.
- Strong background in UI/UX design for customizable devices.
- Knowledge of health tracking algorithms and GPS technology.
- Expertise in designing water-resistant products.