App Developer

I'm looking for a skilled app developer to help create a mobile application that is supported on both iOS and Android platforms. I do not have an existing design, but I have an idea of what the app should look and function. The successful developer must demonstrate a good understanding of mobile app development best practices as well as be able to interpret my rough idea in a creative and innovative manner. Furthermore, the developer should have an excellent eye for detail and an aptitude for problem solving. The project will require extensive collaboration and periodic check-ins to ensure the project is progressing as desired. If you think you have what it takes to complete this project, then please provide a proposal. I look forward to hearing from you.
Design like this: https://play.google.com/store/apps/details?id=de.fightx.clubsensei.production
The App is for a Martial Arts Studio
with the following Items
Our Studio
Course
Videos in 3 Categorys
Nutrition Plan
Advice Someone
We need a Backend for the Admin to enter all the Points.

Greetings Andreas