Walking Meet-Up App Development

I'm looking for an experienced mobile app developer to create an app that serves both to organize walking meet-ups and track walking progress.

The app should include:

Meet-Up Organization Features:
- Scheduling walks
- Sending notifications
- Group chat

Progress Tracking Features:
- Step count
- Calories burned
- Distance walked

Ideal skills and experience:
- Proficiency in mobile app development (iOS and Android)
- Experience with fitness tracking functionalities
- Strong UI/UX design skills
- Experience implementing scheduling and notification systems
- Group chat integration experience

Please provide examples of similar work done.