The regular process seems to be (1) chat with a recruiter via phone, (2) technical screen via phone, (3) on-site interview of 2-5 hours. I was a referral and known to the hiring manager, so Unity waived the technical screen in favor of a chat with the hiring manager that focused on cultural fit and company objectives. The recruiter was really friendly and responsive, and things moved refreshingly quickly. When it came to the on-site interview, I was given the agenda ahead of time: 3 interviews of 45 minutes. The day before my on-site interview I had to reschedule due to a personal emergency and Unity were really understanding. When the on-site did take place, each interview ran way over the scheduled 45 minutes. I was there for a total of 4.5 hours, but the time disappeared quickly. It was a very informal and conversational interview, but they still remained focused on testing my technical knowledge. Sometimes, they let me direct the course of the conversation, and other times they asked me to solve specific problems. The interview felt 'easy', but in retrospect, this was only because they allowed me to steer the interview a little bit (which is really unusual), to talk in detail about my previous experience to prove technical ability (which is easy iff you have the experience), and they did a really good job avoiding making it feel like an exam. I did flub once in the technical test portion, but the interviewer gently guided me onto the right track without being condescending and helped me converge on a solution. I felt like they still got a good overall sense of my abilities, but did not feel like a lab-rat performing tedious, rote coding-interview tricks like in most other interviews. They offered me a choice of white-boarding or laptop, and I chose to use the white-board. During each interview, the interviewers gave me their perspective on why they loved working for Unity which also made the interview feel a little more two-way. All of them were obviously passionate about the company culture. Everyone was also very prompt and I felt like I was well looked after: nobody left me to sweat in the lobby, and I was offered plenty of drinks and was given some Unity swag for my time. The only criticism I have is that they don't validate parking, and I paid for a 4 hour parking ticket because the agenda specified 2 hours. Luckily, I was not towed :)

Overall, I had a very positive experience. The process was a bit long (a little over a month), but it also included the Easter holiday period in Europe/Montreal. The process was: HR phone screen, hiring manager interview, take-home assignment, technical round, and three virtual onsite rounds (Product, Behavioral, and ML knowledge), followed by the final decision. There was only one coding assessment, in take-home format. The algorithm/design pattern/GitHub parts were quite basic. There was also some web development content (CSS/HTML layout), which was more challenging for me since that is not my primary area. I then had a technical round that focused mostly on past experience rather than the take-home assignment itself. In the virtual onsite rounds, the last ML round covered many ML topics. I prepared a lot and was able to answer many of them, though not all. The interviewer was very helpful and willing to share knowledge, which I appreciated.