Citadel Software Engineer interview experience

The process felt pretty intense from the start because it was four straight, one-hour sessions with a meal break in the middle, all conducted virtually. I talked with multiple interviewers from the same team, and the last person was the team lead.

The first two rounds were comparatively smoother. One interviewer walked through their team, I introduced myself, and we jumped into a pair-coding session focused on designing an order book. The next interviewer leaned into algorithmic stock-trading style questions with dynamic programming, then kept adding constraints like fees and freezing