Build me an App for my online classes

I have an idea for an App that will help my students to schedule classes and for new students to sign it. Other features will be disclosed after awarding. The audience will be from 18 years old and up. Ideally, I would like it to work both on Android and on iOS, but we can start with Android only. We are looking for a full stack developer, preferably teams. If you read this, place th word "moist" on your bid.