VERY long, over 10 interviews. No take home, thankfully, but the final round required a whole day to go through 5 hours of questioning. Nothing was out of the ordinary, but it felt excessive and disappointing to not get an offer after spending what amounted to 10 hours of interviewing with different Rioters

I made it to 2 out of the 5 phases of the interview. I interviewed with the recruiter and one of the research team member for my technical interview. The entire process from the application submission to technical interview took about a month. I was told initially by the recruiter that I am one of the last people who is getting interviewed for the position and that everyone have been way ahead of me in the process. After that statement, I felt like the research team already knew who to pick for the role, but I stayed interviewing with them anyway. In the end, I asked for feedback but they denied my request. I applied to Riot before and what I know about them is that they are very keen in giving feedback. But I guess they changed that part of the process now. So if you like receiving feedback from interviews, don't expect it from Riot. Overall, my experience with the entire interview process was okay. The recruiter seemed enthusiastic and helpful. The technical interviewer was knowledgeable. But in my opinion, the process lacked the capacity to assess the real strength/weaknesses of a candidate.

Schedule an interview, conduct the interview, wait for response. Rinse and repeat. The process itself is straightforward, however the hiring team may get mixed up in filtering candidates even after an interview is scheduled.