The process began with a short phone interview which focused on my background (CV). After that, I had a two-week period to complete a programming home assignment (matching challenge). Following the submission of my solution I was summoned to a long face to face technical interview (~2 hrs) with the team lead (one interviewer). We've discussed my solution and several probability and statistics questions. I've got a negative answer about two weeks later, although I could tell that the interview did not go well beforehand. I've been treated fairly and politely along the entire process.