I can build your project using Flutter SDK with for android and ios. I have implemented SignIn by Google,Facebook, Instagram with firebase.
Flutter Skills:Backend(Firebase, Laravel, Codeigniter),DataBase(MySql, Sqlite),JSON and serialization,platform channels(platform integration),FlutterFire(third party platform sdk),StatelessWidget,StatefulWidget
I can build your app with high quality and you will be satisfied about my working result.
If you provide me detailed requirement and design for app, I will start immediately.
I have ability to help you using skill you required and can be realized it anytime.