Great interview experience. I had to present a case study I had been given to the panel, they had questions about my thought process when solving the case at hand. They then asked a few technical questions relating to the role, followed by formal questions and asked if I had any questions. The whole idea is to understand your thinking patterns and ability to think on the spot. Great experience, I felt right at home. The trick is to just relax and keep the conversation going - don't let it be one-sided.