First stage was a screening interview with a recruiter who was professional and great to chat to. Was contacted a few days later with a follow up second stage interview, this time with my prospective manager for the team. This interview was also professional and courteous and I felt that it was very productive as it went over the role, the expectations for the role (travel, expertise, etc) and allowed me the chance to ask questions. A week later, I was asked if I could attend an on site interview loop at their San Francisco office, this would include paid flights and a hotel stay. Unfortunately I had to decline as I was already on holiday in the UK but was able to compromise with an interview here instead. This loop lasted around five hours and was with five different people from various teams in the org I was applying to join. The questions varied from datacenter engineering to network and sysadmin ones. They were all challenging and really pushed me in the right way to respond by digging deep to see how much I knew! 24 hours after that I received an offer which I accepted!