I applied through my university. The end to end process took about 2+ months. First, you had to do video screen where you record yourself answering various questions they give you. Some of these questions include: what do you know about the terminal? Why do you like technology? You have a minute or so to answer these questions.
Then, I heard I moved onto to the on campus interview part. I was interviewed by two Bloomberg employees who were really nice and friendly. The interview was pretty relaxed, and they asked basic questions about my resume. They also asked me why I was interested in finance.
I found out a week or two later that I had a super day. The super day was the hardest interview I've ever been on to this day. It was 80% case studies- 2 of which were individual, and 1 was a group case study. The group case study was about reading the same article, and having one team advocate for one argument and the other team advocate another. The article was a tech related article. The individual case studies were around going through Excel data, and then working through a process map. You had 15/20 minutes to do each of the individual case studies, with a Bloomberg employee watching you the whole time not being able to help you at all. If anything, it was ridiculously nerve wracking. The individual case studies were extremely difficult as well, so I felt like an idiot trying to decipher what I actually had to do while you have a big timer in front of you counting down. Towards the end of the day, I finally had my 1 on 1 interview with a manager (which I was actually prepped for unlike the other case studies), but it was so nonchalant and almost seemed so unimportant to the entire process. It was basically a walk through of your resume. In my situation, I was aware there was going to be case studies but not to the extent of what they put you through. The case studies are so draining, and truly don't measure your ability on what you can bring to the company in my opinion.
In between the case studies and the interview, the employees walk you around the campus and show you everything. You sit and chat with them in the kitchen, just having small talk. It was confusing to understand if during this sit and chat they were evaluating you or just trying to pass the time. The whole super day lasted from 8am-1pm (including lunch)...so it was a ridiculously long day. They serve you lunch at the end which was nice. The entire process was enjoyable for me until the super day. It was completely unexpected and totally unfair in my opinion. They let you know in a week or so if you get the job or not.