Your project can be a native app or a hybrid app for both Android and IOS.
If you want Native app, it is made of Xcode(swift 4 or 5) or Android Studio.
Also, To make Hybrid app, it may be used Flutter or React Native.
I can build your app with high quality and you will be satisfied about my working result.
- Native App
IOS skills:In-App Purchase, API integration, Firebase, Core Data for local storage, Push Notification,Alamofire,networking library,Facebook login /sign up.
Android: Android SDK, Java for Android, JQuery Mobile, CoronaSDK, C++
backend development: Firebase, node.js,RESTful API,laravel, codeigniter.
- Hybrid App
Skills: Redux,Recompose,JSX, ES6/7,Apollo Client/GraphQL Server,FireBase, AWS and so on.