About a month after submiting my CV I got sent an email to arrange the interview. It was a one-stage interview (I don't know whether that was because I was an Intern or not) during which I got asked a few questins regarding 2 projects I had on my CV. One was about a compiler I made for a C-like language and another about making some modifications to the linux kernel. I got asked further questions about each project after elaborating what was the project about. At the end of the interview I was told that they want me to work (as an intern) there and asked me when can they have a final answer from my part to which I replied immediately since my Internship application deadline was pretty close.