The process took 6 weeks. I interviewed at Citadel (Chicago, IL)
Interview
Having interviewed with at least two dozen different companies in software and finance ranging from series A startups to the biggest names in the industry, I can safely say Citadel has the most bizarre, pointless, waste-of-time interview process I've ever gone through. Indeed, if I had known from the inception it would take an astounding four weeks to schedule a first round interview due to a complete lack of communication on their end, I would never have even gone through the process, to say nothing of the following rounds. Citadel demonstrates no interest whatsoever in their candidates, especially compared to smaller firms like HRT or Jane Street in their own industry, and pretty much any firm in the software industry. Interview literally anywhere else.
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 :(
I had an HR screen where they asked about my experience at my previous company and to prepare for C++ to talk with the hiring manager. They asked about why I got laid off at my previous company.