Was referred by a previous coworker. Did an initial recruiter screen followed by a coding interview and manager screen which all went very well. These were followed up with a threat model and collaboration interview. From what I was told I was the very first candidate to be given this threat model interview and while I think the interviewers tried their best it wasn't anything like any threat modeling experience I've done. Typically you'd be reviewing the new feature during a threat model and have the data flow diagrams. They expected to both generate the data flow diagrams and do threat analyze on EVERYTHING in 30 minutes. At the end of the interview I asked if this was really what their threat modeling internally is like and they said no, diagrams are provided and the scope isn't as wide. While the collaboration interview wasn't the worst behavioral interview I've done it was top 3. The lead interviewer joined late and basically skipped introductions. They wanted 4 situations. A time when collaboration went well, another when it didn't go well, a time you got feedback you didn't agree with and a time you got feedback you how it helped. I started by going over a collaboration story I thought went well but the interviewer insisted that it was a negative example and wanted me to come up with a positive example. I tried hard to understand what they were after but was unable to actually figure it out. The Q&A was also pretty awkward and cagey. After the collaboration interview I was very tempted to pull out but I know my old coworker really liked working their and the reviews from others were generally good. I figured since that interviewer wouldn't be my manager and I did enjoy the hiring manager interview I would keep going. The final interview was a 2.5 hour design and implement exercise that I took a half day off for. Unfortunately I got an email the next day that they were cutting the loop. While the email was sent about 3 hours before the interview I was focused on doing work before I took off time to do the interview and didn't see it till 30 minutes before it was suppose to start. I get that sometimes loops need to be cut. But to send a short email to someone who went through most of the loop and was a referral is disrespectful. At that point you owe the candidate at least an attempted phone call. And then on top of that saying only "the feedback is not strong enough to proceed" and then requesting feedback about the interviews is outrageous.