The skype interview is all about your most recent research paper. No behavioral questions. I was told the exact project I will be working on if I were given the offer. First round screening is more selective but once you are chosen to be interviewed the chance of getting the offer is very high.

HR contacts you to schedule a phone interview. The interview itself is however basically meaningless because you have already been selected. This is only a check to sort out people who only look good on paper but prove to be socially awkward or incapable to talk to people in a professional manner.