Gmail OAuth Integration for Node.js/Express App (Replit)

I have a live Node.js/Express app hosted on Replit with a PostgreSQL database. I need Gmail OAuth integration built end to end. Scope: user clicks "Connect Gmail," authenticates via Google OAuth 2.0, app reads their last 90 days of sent emails, extracts unique contacts with name/email/last interaction date and conversation context, stores them in the existing contacts table. Read-only Gmail scope only for now. Stack is Node.js, Express, Supabase/PostgreSQL. The OAuth app is already configured in Google Cloud Console — I'll share credentials. Budget $500–800. Need it done in 1 week.