Overall, the experience was good. I was well prepared for the final round, but I don't think I communicated my examples as effectively as I could have. Aside from that, I think the interview went well overall.

First communicate with recuriter, who was very nice to introduce the company and the position. Then first round is coding interview, and the following is System design. Each one is one hour. After that, it will be the last loop, 3 round interviews, on the company values

First there were coding and system design interviews on video chat. These were fairly straightforward as far as any larger tech company goes; you will likely get some details from your recruiter but I'd recommend being able to describe how to implement some of the basic functions on a streaming site (Kick) or a betting site (Stake) for your focus (frontend/backend). The more opaque part of the process was during the 3 onsite interviews, when different people will ask you to tell them stories about things you've done in your career. I was able to answer all their questions and received positive responses during the interviews. One interviewer said they currently have "unlimited hiring capacity for engineers". After, I got feedback that I was a "great cultural fit" but wasn't getting an offer. I also heard that other candidates have had similar bad luck with this particular company. I have an idea that they wanted to hear more stories about working on things at large scale, but ultimately it was unclear to me exactly what they expected, so if you're going to interview with them I'd be prepared to talk about scale. A red flag to note is that I was interviewed by a very senior engineering manager at the company and in response to one of his questions, I described a time when I optimised some code that was running at O(n^2) to run at O(n) efficiency by implementing a different data structure. He said he didn't know what big O notation was, which I found a little strange.