Wearable Health Monitor Development

I'm seeking an experienced developer to create a sophisticated health monitoring wristband. The device should track oxygen levels, stress levels, body temperature, and GPS location, and be compatible with both iOS and Android platforms.

Key Requirements:
- Health metrics: Accurate real-time tracking of oxygen levels, stress, body temperature, and GPS.
- Compatibility: Seamless integration with both iOS and Android.
- User-friendly interface: Intuitive mobile app for data display and notifications.
- Design: Comfortable, durable, and aesthetically pleasing wristband form factor.

Ideal Skills and Experience:
- Expertise in wearable technology development.
- Proficiency in mobile app development for both iOS and Android.
- Strong background in health monitoring sensors and data accuracy.
- Experience in user interface and user experience design (UI/UX).
- Knowledge of GPS technology integration.

Please provide samples of previous work, especially in wearable devices and health monitoring systems.