The hiring manager didn't even know what I was supposed to be interviewing for and mistakenly interviewed me for the wrong position. The recruiter apparently put my application for two positions, one of which I did not apply for. Once the confusion was realized at the end of the interview the hiring manager told me that the position I applied for had just been filled.

Quick call with HR, phone screen with manager, panel interview with team, phone screen with CEO. Was pretty informal most of the time, with interviewers being fairly easy going. Team was mostly friendly but slightly off putting as they were rather rude at the end of the process.