I applied online. The process took 4 weeks. I interviewed at Bloomberg (London, England) in Feb 2018
Interview
The interview process consists of 4 steps: phone interview (about 45 minutes), team leaders interview (about one hour, a member of the sales team and a member of the analytics team), managers interview + shadowing (one manager from sales and one from analytics, plus 30 minutes shadowing with a member of the analytics team) and head of analytics interview
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.