First Round: Two 45 minute interviews. One was very formal, structured, and behavioral question based. Interviewer referenced a guide with questions and took notes. The other interview was informal, comfortable, and more of a get-to-know-you feel. This interviewer only used my resume to make notes on, no formal guide.
Second Round: The night before was a dinner to meet a current employee, ask questions, learn a little bit about the second round interviewers, and hear what the day for second round interviews would entail. The day of the interviews began with a breakfast followed by assessments (Wonderlic and situation-based assessment). There were four 45 minute interviews separated by a break and lunch. The interviews varied by interviewer, but were composed primarily of behavioral-based questions and guided by a formal document listing interview questions.