Develop an app

I am needing an app developer to assist in creating a health + fitness app. It will contain recipes, home workouts, gym workouts, goal trackers etc. Users will pay on a subscription service which will gain them access to the app. Then we can also run quarterly challenges where the users will pay a one off fee to do a 6 week challenge for example- in which they would receive a personalised meal plan and workout regime. App will need to be available on android and apple.