Started off with a few simple questions, abstract data types etc. Nothing extremely tricky, or things you would necessarily be able to prepare in advance. Standard "do you know your stuff" questions. We moved to a whiteboard afterwards, where there was a function prototype written and the rest of the function to be written. It wasn't a very hard question, totally do-able if you've taken your core CS classes.

After talking to them at the career fair, they invited me for a 45 minute on-campus interview. We ended up talking for well over an hour. Very relaxed interview environment