Citadel and Citadel Securities interviews probe game theory, probability, and optimal decision-making at a high bar, reflecting a top-tier hedge fund and market maker.
In 2026 expect game-theory problems with optimal play (the coins-from-either-end game solved with dynamic programming), geometric and combinatorial probability (the broken-stick triangle problem), and expected-value games with optimal-stopping rules (a die game with a re-roll). Interviewers reward candidates who set up the recurrence or region argument cleanly, state their strategy explicitly, and compute a fair price with confidence. For quant-developer roles, strong coding and algorithms are tested alongside. Practise optimal-play reasoning, geometric probability, and stating decision rules precisely under questioning.
About Citadel
Citadel (Citadel LLC) is the world's most profitable hedge fund, founded by Ken Griffin. The Hyderabad quantitative engineering team works on global trading infrastructure, market microstructure research, and systematic strategy development.
Apply or get sourced; online assessment or recruiter screen
Probability and game-theory round
Technical and algorithms rounds (for quant-developer roles)
Final rounds with the desk, then offer
Round 1 (45-60 min)
probability and expected-value round with games.
Round 2 (45-60 min)
game-theory and optimal-play problems.
Round 3 (45-60 min)
algorithms and data-structures round for quant-developer roles, or deeper quant for research roles.
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