The process was a 45-minute video call with two of the engineering managers, followed by a half-day in their offices. The in-person part comprised of a technical interview with one of the lead developers and a software architect, some pairing with one of the engineers, and an informal chat with some of the wider team (someone from marketing, and someone from accounts if I remember correctly).
It was all very friendly and not at all like some of the high-pressure technical interviews I've done with other companies.