First 'interview' was more of a group info session with myself and 2 others. We were then briefly introduced to the CEO. My second interview was at the branch office with their office manager and then the department heads. Then my third interview was back in Waltham with the CEO.
I got offered the position and had to either decline or accept right then on the phone, no offer letter or anything. I accepted in the moment, and had a meeting at the office later that week. After going over more information about what I'd have to do for the position and benefits and compensation, I declined the offer.