Google OAuth 2.0 Integration for Flask App

I'm looking for a skilled backend or full-stack developer to integrate Google OAuth 2.0 authentication into our Flask-based social networking application. The goal is to allow users to sign in using their Google accounts securely and efficiently.

Key Responsibilities:
- Implement Google OAuth 2.0 login functionality
- Configure secure token handling and user session management
- Integrate login flow with our existing user database
- Ensure proper error handling and token refresh flow
- Provide clean and well-documented code

Requirements:
- Strong experience with OAuth 2.0 and Google APIs
- Proficiency in Flask
- Experience with authentication flows in modern web apps
- Strong understanding of security best practices