Applied through their website and got an email from recruiter a couple of days later. She arranged a phone interview with the group leader and two engineers at the same time. They asked a bit about my experience, a few C++ questions and some very basic unix shell command questions - I did not expect for such basic questions.
After a few days I was invited for an onsite interview with this group. I had 10 1:1 interviews plus HR at the end of the day. My interview was scheduled for 8:30 with HR, but he did not show up. Started 1:1 interviews with engineers at 9:30.
Most questions where about C++, software engineering practices, networks (TCP/UDP). There were a few of those annoying trick questions. I got to talk about some of my projects with a few of the engineers, which then asked about some specifics.
In the interview with the group leader he described at a high level the project that the position was for, and emphasized that work may get hard often - many releases and pressure. He warned me about that many times as my previous employer dealt with research projects and didn't have as many hard deadlines.
More than a month passed without any feedback and any refunds from my expenses during the trip - not very professional of them. Overall it was good for me to see how I did not fit in that group. The vast majority of engineers are from the same country, and I prefer a bit more diverse group. Also most of them look very tired, which is not a good sign.
Benefits seemed to be very good and location can't get any better. Maybe I'll try a position with another group at QC.