Relatively fast, only 3 stages (CV -> HR tele interview -> Final in-person assessment). Overall, the experience is good. The final assessment consisted of competency-based questions and a case study regarding to the role. I was also interviewed by two senior people from the US side on zoom.

It was a 2-hours interview with a case study (there were two people from the London office), and two senior people from the US (separately, 30 mins each on zoom).