There were 3 interviewers. The interview was held in English and lasted 30 minutes sharp as they informed you in the email. Their English is not very good so do not worry about you English skills or your accent. I found the HR team not very well trained as there were moments of pause and it was a bit awkward. In my opinion a well trained and professional HR team should be able to have a conversation with the candidate and make him feel comfortable. Plus, they let you know at the interview that you are expected to stay overtime to meet deadlines and do a bit of everything, so the idea I got was that they are just looking for someone to do all the work!