Backend and App Development (Native for both iOS and Android) -- 2

I’m looking for a creative backend, iOS and android developer to create a native app on both android and iOS. The app in a nutshell will be for booking sports trainers, therefore, the users of the app are 1. Customers looking for sports trainers 2. Sports trainers App details and features: Users: Searching through the trainers and confirm bookings, calendar, scheduling and rescheduling, recurring sessions, payment, creating/ joining sports events, messages with the trainers, commentary on the events, cancellation policy and refund Trainers: Creating profile (details, pictures, videos), adding different sports details they train, fees/ offers/ packages for each sport, group offers, location of the sport venue, location for areas that the trainer would come to serve the user, calendar, availability, creating and joining events, messages with the users, commentary on events, cancellation policy and refund, license to train validation and profile validation Admin: Admin common features of controlling the app, refunds, cancellation, scheduling, defining automated penalties, policy control, performance metrics dashboard, promotions and offerings for all users or specific users, sessions percentage fees, communication with the users …etc The app screens have been already designed and finalized on Figma; therefore, I need the following: • Backend development • Native iOS development • Native Android development • Payment gateway and all the required APIs • 6 months full time maintenance/ support • Uploading on the app stores