Custom SSO for Buddyboss Network

I'm seeking a developer experienced in OAuth2 and Buddyboss to create a tailored Single Sign On (SSO) solution for a network of Buddyboss sites. Solution needs to be built using open source software and scalable without restrictions on number of users. This is a proof of concept and implementation validation - a more robust solution will be implemented once we validate the ability to connect users to multiple websites, using a single registration and login. We'll start with a small network of 10 websites

Key Requirements:
- The SSO should support the OAuth2 authentication method.- Open Source code only
- It must facilitate logins from Google as an external identity provider.
- The solution should sync users' profile details and activity history across the Buddyboss websites. (additional details TBD)

Ideal candidates will have deep knowledge of OAuth2 and Buddyboss, and experience in developing custom SSO solutions.

Prototype running on https://activist.network/