Gym Usage Tracking Device Development

I'm looking for a skilled developer to create a device for gyms that tracks workout metrics. The device should have the following functionalities:

- Track timings for workouts
- Monitor barbell, dumbbell, and machine usage

Ideal skills and experience include:
- Experience with fitness tracking technology
- Proficiency in hardware and software integration
- Background in data collection and analysis
- Ability to design user-friendly interfaces

Please provide examples of similar work done and a breakdown of your approach.