It was described to me to be split into three parts. First of all there was a quick chat with the recruiter who basically digested the CV with me as reference so that he could then present it to the hiring manager. The hiring manager was interested and then there was a telephone interview organised. This was mostly just a general chat about experience and then a very small technical element. Unfortunately I was super super prepared for a problem solving question but he simply asked "How does the internet work?", which took me completely by surprised and I answered terribly. Still I personally am not sure about asking that question for someone who is all about problem solving. Also its a question that could be answered after about 5 minutes of Google-ing! With regards to the recruiter though, he was excellent, super responsive and eager to help!