I was reviewed by a panel of 2 people. Having been already interviewed by the company once more back in 2009 I wasn't expecting a radical increase in difficulty of the interview process. Back in 2009 we just discussed my studies and classes/projects that were relevant for this position. Now forward in 2016, I was interviewed at 17:00, after I had finished for the day at my current job and had not prepared for what was coming next.