Need login system in app

Mobile App Developer High Quality and Active Service I am a senior Mobile Application Developer have full experience. I will try best effort to provide great solution and whats more if I hired you'll definitely receive outstanding result before the project deadline. I can manage anything that comes up with iPhone, Android, Unity 3D, C#, C and web management. I will offer active service , most speed and high quality.

What kind of login system ? Is it like do you want to login in app through Google or Facebook or something like that ?