You first get a plum evaluation, and then they should send you an online assessment. They may then invite you to talk on the phone with an employee. Finally they will schedule you for an in person interview.
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.
I made through the initial plum evaluation (logic, personality, communication and teamwork skills) and then followed by a pre-recorded video interview. You should be fine with the plum thing if you show you got great communication skills and a team player.