I hope that this will come in useful and one day the hiring freeze will be lifted! I don't remember much about the phone interview, but it wasn't anything out of the ordinary.
My interview experience was very positive. I met directly with the engineers I would be working with. I got the usual rounds of basic engineering and virtualisation questions, but I felt like when it became clear that I was doing OK with them we moved into discussion about my grad school research and some of the problems and challenges they were working on. Overall, the interviews felt more like discussions than harsh grilling.
I appreciated this because I got to see these were the type of engineers I would like to work with on a daily basis.