Google OAuth 2.0 Integration for Base44 Platform

We need an experienced developer to implement secure Google OAuth 2.0 integration for our existing Base44 creator platform.

The project involves building a complete authentication system with server-side token verification, session management, and refresh token lifecycle handling. You'll also need to implement quota-aware API integrations, scheduled sync workflows, and robust error recovery systems.

Requirements:
• Strong experience with Google OAuth 2.0 implementation
• Server-side token verification and validation expertise
• Knowledge of secure session handling and refresh token management
• Experience with API quota management and rate limiting
• Background job processing and scheduled sync workflows
• Error handling and recovery system design
• Experience working with existing platform architectures
• Full-stack development skills (backend + frontend integration)

Deliverables:
• Complete OAuth 2.0 authentication flow implementation
• Server-side token verification system
• Session management and refresh token handling
• API integration with proper quota management
• Scheduled sync workflows and background job processing
• Error recovery and logging systems
• Documentation for the integration

This is an hourly project where you'll be working within our existing Base44 platform architecture. We need someone who can integrate cleanly without disrupting current functionality while improving reliability and extending capabilities.

We're looking for a developer who can start immediately and deliver production-grade code that's stable and maintainable.