Mobile/Web Health Game App Development (in Bubble)

I am in need of a game developer with experience in both mobile and web-based app development. It needs to be done with bubble.io. The game is designed as a health initiative, connecting fitness with a social cause. The main objective, apart from engaging users in an interactive gaming environment, involves:

- Implementing virtual challenges that users can partake in.
- Incorporating a feature to track fitness levels and progress over time.
- Integrating social sharing options allowing users to share their achievements on various platforms.

A professional with experience in developing health and fitness applications would be ideal. Knowledge of gamification concepts, experience with creating virtual challenges, as well as a strong understanding of fitness tracking technology is required for this project. Proficiency in integrating social media sharing capabilities is also a must-have.