I applied online. The process took 4 months. I interviewed at Citadel (London, England) in Jan 2018
Interview
Phone interview, with a coding problem. Like in any other tech companies, I had to write a solution (code) to a fairly simple problem. It was quite an easy question and the time allocated was about 20 minutes. Overall, it was 45 minutes.
I applied through a recruiter. I interviewed at Citadel
Interview
I was reached out by a recruiter to interview for a contractor position on a trading team. The question they asked was strange and nothing to do with the position.
Interview questions [1]
Question 1
Convert a string to an int without using Java library.
Online assessment with 3 coding questions on bfs and stacks etc.
First round on a simple coding question with some basic CS questions on top of it and also asked many CV questions and motivations
Did not proceed after this round
OA then phone interview, discussed about experience, coding rounds, and some open ended questions afterwards. The last 5 - 10 mins was for interviewee to ask questions back. Didn't pass this round :(