I applied online. The process took 5 days. I interviewed at Citadel (Chicago, IL) in Dec 2008
Interview
Citadel seemed to have very specific skill and experience objectives. If you match, you're in luck. Otherwise, expect to be dismissed summarily. Interviewer was pleasant enough, but he seemed to lose interest as it became apparent that I was not into any of the niches he was looking for.
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.