I sent my resume and then I received an Introductory email. We then arranged and attended two virtual meetings with partners. The two meetings were relatively brief and the participants were friendly.

GS will claim the interview is "informal" but always be prepared. Most of the department directors/ partners in charge of the practice groups are very savvy and in tune with their needs/ limits. After speaking with someone initially, there will likely be 2 more rounds. People are both professional and approachable-- let your expertise and personality shine. If you don't, you likely won't fit in there.