Went to National Instruments's booth at the career fair and was offered an interview the day after. Since the recruiters were only at my campus for a little while, they had a cycle of interviewees coming in and out every 30 minutes. The interview, conducted by two interviewers, consisted of both behavioral and technical questions and ran about 45 minutes or so. At first, there's a short resume screening then the interview went straight into the core with behavioral and technical questions.