The on-campus interview was very conversational and easy. It started off with questions about your resume and yourself with some behavioral questions woven in. Nothing to really stress about. When you get there early there are a bunch of employees sitting outside who are very friendly and conversational. The interview itself lasted about 30 minutes. Make sure to have followups to the questions you ask them. Since it's a medium sized firm they like when you emphasize the size of the company along with the company culture.