Their process was a bit slow, taking about 2 weeks between each interview step, but the recruiter was very responsive when I emailed for updates. The process was HR phone screen -> 45 minute video interview with the supervisor for this role -> 30 minute video interview with their UX contractor -> 4 hour onsite of 6 different sessions with various people. The onsite was almost entirely with engineering people that the role would have interacted with. There wasn't any type of formal portfolio presentation, take home assignment, or any on-site workshopping.