It was an interview of approximately 1 hour via Skype, where only one interviewer was present. He was very friendly and polite and asked many questions, only few of them were technical, in the end he said he would contact me with the rest of the team for a technical interview. I haven't gotten any feedback from them and I had to send an email to ask what was going on, because from my point of view, the interview went actually pretty well. In the end the reason for the rejection was definitely a lie, which is explained below.

They were very particular about who they hired. They even instructed the recruiting agency not to mention the position unless they came across a certain type of candidate. Then it was a phone interview and 2 rounds of face to face. Not bad overall, but definitely more in depth than most.