So, it is a total of 4 interviews. The first one is with HR, online on Skype. This typically includes HR questions plus a little puzzle (in English, regardless of whether the company HQ is in a non-English speaking country). Then there are two professional interviews, usually a 2-on-1, and it ends with another HR interview.

The puzzle they asked me for, for instance, was a fairly simple one: the typical apple puzzle.

You have nine apples of the same size. Nine of them weigh the same, and one of them weighs slightly more or less. How can you find the apple that is different by using a balance and only two weighings?