I want an app for my fitness startup

I am looking for a developer to build a mobile app for my fitness startup. I need the app to have some additional features and functionlity, with a mature design style. Specifically, I would like it to have a minimalist and professional look, as this app will be used by a wide variety of users. I'm familiar with the process, so I can provide additional guidance throughout the development process. I'm very excited to find the right person who can bring my vision to life!