Initial 30 min chat with a very pleasant recruiter, who described the rough whole process, which is supposed to contain 2 technical coding rounds, then some pair programming and bug finding rounds.
For potential interviewers for this company, I urge you to practice your coding speed, because this was literally the only thing that the interview was looking for. Being someone who had lots of experience with engineering in the industry for 10+ years, I certainly did not find them to be interested in any aspect of my engineering ability, but rather, speed and speed alone. The interviews were 1 hour, and I was presented with a 45 minute verbal clock countdown by the interviewer, which felt like being on Chopped. As I coded through a rather basic OOP problem, I can hear the interviewer telling me how many minutes I have left, which was a supremely odd experience. If I had named every single variable as foo and bar, and not bother writing tests the proper way, it would have actually benefitted me, because that would have sped everything up; however at that point I had been through a few interviews at other companies for industry hires, that always valued process more than speed alone, that I failed to adjust to this new process.
The interviewer spends 5 minutes small talking with you, which was standard. Then they presented a coding exercise, which to me was quite simple. Due to NDA, I can only describe the problem similar to parsing a JSON like noSQL database objects, and doing some basic data structure manipulation. The follow up question was also rather simple, but I was quite literally between 2-5 minutes short on time, and the timer ended (with the interviewer counting down the last minute as I coded).
Needless to say, from their point of view, I "failed" the process. And I have nothing bad to say about the interview process, since I firmly believe that Engineering is to work with constraints, and in this case, the constraint was 45 minutes countdown, Chopped style. I will say that, this is an industry wide concern, which is, to this day, we as an industry still think the best way to hire an engineer is to treat every interview as an IOI competition.