DataVisor Software Engineer interview questions

I went through one round of technical phone interview and seven rounds of onsite interviews with several engineers, a product manager and the co-founders. The interview questions test candidates on algorithms and background knowledge. For a few questions I did not come up with a viable solution within a few minute. The interviewers had an inspiring discussion with me, which led me to the final solution. I had lunch with a few engineers and they were super friendly. As they were planning to move to a new location, which was 3 minutes' walk from the old address, they also brought me to visit the new office after lunch. In general, I felt inspired and also well respected during the interview.

I was scheduled for 5 rounds followed by a round with the recruiter. I was seated in a small conference room. The first 2 rounds went by fine. Then came lunch time, and I was excited to meet the rest of the team. Instead, shockingly I was given a lunch box and ended up eating all alone in the conference room. It seemed like detention. Anyway, the next interviewer comes in and without taking time to introduce himself, straight up asks a question on the whiteboard. I think by that time they had probably decided not to move forward with me and so I was told the next interviewer was busy and that was it for the day.