Ask HN: Software to Organize and Link Contacts

Is there a system that manages, compares, and builds links between contacts in a database?

In my job I have a lot of contacts, and as I interact with these contacts I collect data about them; where they have worked, hobbies, etc. This is to try and enhance my ability to find new clients, and make additional connections.

I want a system where contacts are AI compared across the entire division with other contacts, and similarities and other data is displayed.

I want a private LinkedIn, basically. Does that exist?