First stage was a numerical test done online within a short period of time. Mostly simply math questions, and only the last couple of questions were more challenging. After 2 weeks approximately, they got back, and second stage was an interview with the HR personnel over skype with the usual interview questions.

HR interview and phone interview There was going to be a 3rd interview in person in the company but they decided to close the position because there was a problem in the team.