First interview is a professional interview in which you need to solve some programming riddles. Its all about your approach to solve the problem and not about the actual code the you write. In that professional interview they also check that youre a nice-to-work-with person. If you succeed on that interview you go on to an HR interview that lasts for an how in which youre asked all the regular HR questions. Third interview is an IQ test, where you need to solve puzzles of some sort and an interview with psychologist. If you managed to go through with all these steps than you are required to go through a background check (security company)

three interviews, includes HR, the first one is with the manager, the second is with is manger. the first one was easy exam, one week prepare with litcode will be enough