First, someone from HR contacted me via phone (after time arrangement via email) to go through basic skills that were mentioned in the job description. It was very friendly and short (10 min) phone call. Then they contacted me again for the second phone interview. It was a technical phone interview. I already knew the name and the title of the interviewer. The interviewer called me on time, and after very short introduction, he directly jumped through my resume and asked me some questions about the projects that I had mentioned in my job experience section. It took 20 min, and then I asked some preliminary questions about the type of algorithms that they are using in this position.