Dear Client, How are you?
As I'm a senior full-stack Mobile Expert, I have enough experience of more than +5 years.
I have expertise in Android, Swift, objective C, Ionic, React Native, etc...
Especially, I'm very familiar with Social Authentication using Google Firebase, Google-Plus, Facebook API, etc...
So I can bring you perfect result as you want within a short time.
If you want to add only social authentication, It will take 1 day to complete these functions.
Let's have a chat to discuss your project more details.
I will satisfy you with my rich experience fully.
Looking forward to hearing from you.
Best Regard.