I had two phone interview with them. They asked algorithmic questions on the fly and sometimes without clear explanation. Every time that I answered a question, they asked a harder question. One of the interviewers asked a question about a multi threaded system and it was clear that he has not any experience with such systems. He also asked me some questions about Scala syntax. They sent the rejection two hours after second interview. The rejection was sent from a no-reply email account. It was rude and not professional.