Read almost all of the Bloomberg interview posts during my interview prep, so figured I'd return the favor! Had two technical virtual onsite rounds (1 hour each), and then an HR and engineer manager round. Questions were all straight off of leetcode's bloomberg tag (medium to hard), with some modifications. I'd recommend just doing as much of the bloomberg tagged questions as possible when preparing, and make sure you really understand the most optimized solution.
HR round was about 45 minutes, and was strictly behaivoral questions. I wouldn't think too much about it, just answer the questions honestly. The engineer manager round was the one I struggled with the most, it had some system design questions that I wasn't prepared for but again, I think its most important to ask the interviewer questions and try to approach it collaboratively. I honestly didn't think I would get the offer after this round, but I think the bar is lower for system design questions for new grads. It took exactly a week to get a verbal offer.