Node.js Web App Development

I'm seeking assistance to enhance a node-based web app I've developed on Replit. The app is primarily for internal use, with basic UI/UX design and several functional features already in place.

Key Tasks:
1. Gmail Account Integration:
- Allow users to connect multiple Gmail accounts (OAuth authentication).
- Implement features to read, send, and organize emails (labeling).
- Need guidance on setting up Google Cloud API via Gmeet/Zoom.
- Currently, the app supports only one user connecting up to four Gmail and four IMAP accounts.

2. Google Sheets Synchronization:
- Ensure the "lead" section of the Replit app syncs correctly with Google Sheets.
- Implement both reading and writing capabilities for 10-15 data columns (contact info, lead status, sales data).

Ideal Skills and Experience:
- Proficiency in Node.js and Replit.
- Experience with Google Cloud API and OAuth authentication.
- Strong understanding of Google Sheets integration.
- Familiarity with IMAP and Gmail API.

Looking forward to your expertise to make this app fully functional!