Firebase Auth Integration

I need Firebase Authentication integrated into my existing project, specifically for email and password login and signup. The project is built on both iOS and Android platforms using Flutter.

Requirements:
- Integrate Firebase Auth for email/password sign-up and login.
- Ensure smooth functionality on both iOS and Android.
- Must be experienced with Flutter and Firebase.

Ideal Skills & Experience:
- Proficiency in Flutter development.
- Experience with Firebase integration, especially Firebase Auth.
- Familiarity with both iOS and Android deployment.

Looking forward to your bids!