I'm an undergraduate student. For the phone screen, the interviewer asked for a basic introduction and we moved on to two technical questions:
I had two technical rounds for the on-site. Both rounds began with giving an introduction and doing a deep dive of a project on your resume. The interviewers asked a lot of follow up questions about the project so it's good to prepare an answer prior to your interviews!
Overall, I would say I have had the BEST experience interviewing with Bloomberg. Their interviewers are very friendly and collaborative. They let you take your time and really shell out your thoughts.
UPDATE: I ended up getting rejected. Some say that you should be moving to a third and fourth round if you do well on those first two rounds. I think I did really well on the first round, but not so hot on the second round so eh, it is what it is. Good luck to everyone else!!