Building a android/ apple mobile app

Need to build a mobile app which uses react native, google firebase authentication and firestore for data collection as technology stack, to create a steaming service for audio, video and articles. Some of the work is already complete. We have described what has been already done: User authentication and new user creation. Basic screen navigation and tab components. Calling list of data form firestore based on the category selected/recommended. Audio and Video track play. The work which is need to be done- Cleaning of all the firestore calls Cleanup of the screen layouts and navigation after user actions/ authentication Need to give finishing touches(like correct error messages or information) and make app screens look good with animations and backgrounds Updates to user creation that will incorporate a discount promo code. Need to integrate the subscription service in the app. Through google play services for android and Apple Pay services. Cleanup of calls to provide fast operation/ incorporate caching in the app. Please bid and we can discuss / provide the exact technical requirements. We would like to get down following things - 1. app loading screen (with app logo) which will be initial screen for users 2. integrate subscription/payment system for iOS and android (free trial / payment) 3. discount coupons during registration(discounts offered through affiliates) 4. Home screen — audio, video, articles 5. Explore screen —include thoughts from database 6. Category Screens — tabs should be full screen, with subclasses like (audio, video, articles) 7. Security for database and passwords 8. More screen — account information (view/edit), subscription Clean up: api calls with error should be displayed correctly layout/animations of screens should be appealing to user. background for screen should extend to the bottom tab navigator logout button on top of every screen screen navigation should be clean speed/caching for api calls Attching the screens from the existing API-