Was rejected after 4 rounds over the course of two months. Sadly, the 4th wasn’t even to be the last round. Interviewers we’re extremely pleasant, though I began to suspect something was amiss after an offer didn’t follow round 2 like I had been initially told, or after round 3, and when I was told that round 4 would be a precursor to a 5th round. Rejection email held zero constructive feedback which felt warranted after such an involved interview process.