I need a fitness app developer (German speaking would be a big plus)

Fitness App
Workout plan - videos (algorithm through questionnaire)
Exercises - videos (algorithm through questionnaire)
Nutrition - recipes & videos (algorithm through questionnaire)
Habits
Daily challenges (algorithm through questionnaire)
Music (stress relief)
Programs
Packages
Marketing
e-shop (sports wear, supplements)
financials (Swiss, German & Austrian market)
Contacts
Calendar (reminders - schedule measurements)
Events
Chat
Groups
Files
Forms - Questionnaire
Settings
Support (very important)
Connect with wearables (Apple Watch etc.)