Overall not too difficult! The first round was pretty brief, with basic questions about your experience and a general overview of the business. The second round was a bit more difficult, with more challenging questions. I found this very beneficial, as I got to see the events they run for their clients first hand. The third and final round was kind of a recap of the first two interviews, making sure you completely understood the business and the position you were being hired for. I found that kind of refreshing.