I applied online. The process took 2 months. I interviewed at Bloomberg (London, England) in Mar 2018
Interview
Was very long process with multiple stages, more than any other interviews that I've attended with other companies. But the questions were all pretty standard, you'd be able to prepare well by just looking at the ones available on Bloomberg, doing some prior research and being able to present your CV well.
Begins with a personality assesment that also includes puzzles meant to test pattern recognition. The assesment and the personality quiz takes about 30-40 minutes and requires no preperation before hand.
First was Hireview, 1 Hour interview with two team leaders, and assessment centre, consisting of tests, networking, and a final round interview with two team leaders from analytics and sales departments respectively.
Multi step interview process, they have you submit a recorded video interview, then you get selected for a virtual super day where they interview a bunch of candidates at once, then you get an in person. Know about finance and know as much as you can about Bloomberg and its business. Have a good take on AI in finance.