This was 2 years ago. The interviewer was my manager and he is a very chill person. I was asked to explain a project that I put on my resume and the only technical question that he asked was how I think I could improve on this architecture. I think this really varies because a fellow colleague who also previously went through the process was asked about hardware and operating systems so it really depends on the interviewer and your luck :)

Watch your email for a random email from them. You have a very strict (unforgiving) deadline once they send the email with the assessment. The Technical Assessment was composed of two DevOps specific question and one typical SWD question. The assessment was done through HackerRank.