The Optiver Cognitive Interview is stage 4 of 8 in the Optiver interview process, after the Trading / Betting Game. Format: 45-60 min · Zoom with a trader · Optiver Assessment Platform. Final stage for Optiver's Career Kickstarter: Trading program (per a candidate's September 2026 invitation): a 45 to 60 minute Zoom with one trader on the Optiver Assessment Platform, camera on.
Preparing for this round? Practice the 100 questions mapped to the Optiver Cognitive Interview, with worked solutions. A free account saves your progress.
What the Cognitive Interview tests
Games, brainteasers and puzzles, including a market-making game (cheat sheet of terms sent beforehand). Paper and pencil for some games; no calculator or phone. Optiver says it re-tests the online assessment's speed and accuracy and your approach: new information arrives as you go, and if the trader seems to hint, they probably are.
QuantVault maps 100 practice problems to this round. By topic, the biggest groups are expectation (45), probability (45), brain teasers (5), market microstructure (5); by difficulty, 20 easy, 52 medium and 28 hard. 46 of them were reported by candidates who interviewed at Optiver, most recently in Feb 2026.
Who takes this round: Quant Trader candidates. See the full Optiver process and who takes each round.
How to prepare for the Cognitive Interview
- Re-drill the online assessment. Speed and accuracy are tested again, so run the 80 in 8 and the Zap-N games in the days before.
- Think out loud. How you get to the answer is scored, so say your approach and your assumptions as you go.
- Take the hints. New information arrives mid-problem by design. Update your answer when it does instead of defending the first one.
Further reading: Market-making game interview guide · Mental math for trading interviews · How quant superdays work · Behavioral questions at trading firms.
Question types in this round
The 4 largest question types in the Optiver Cognitive Interview practice set; across them the most common sub-topics are expected value, discrete probability, conditional probability, combinatorics, independence, first-passage and stopping times. The questions themselves, with worked solutions, are in the round practice.
Expectation45 in this round
Probability45 in this round
Brain Teasers5 in this round
Market Microstructure5 in this round
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Frequently asked questions
What is the Optiver Cognitive Interview?
It is stage 4 of 8 in the Optiver interview process, after the Trading / Betting Game. Format: 45-60 min · Zoom with a trader · Optiver Assessment Platform. Final stage for Optiver's Career Kickstarter: Trading program (per a candidate's September 2026 invitation): a 45 to 60 minute Zoom with one trader on the Optiver Assessment Platform, camera on. Games, brainteasers and puzzles, including a market-making game (cheat sheet of terms sent beforehand).
How long is the Optiver Cognitive Interview?
Candidates report: 45-60 min · Zoom with a trader · Optiver Assessment Platform.
What questions come up in the Optiver Cognitive Interview?
The practice set QuantVault maps to this round centers on expectation, probability, brain teasers.
How should I prepare for the Optiver Cognitive Interview?
Re-drill the online assessment. Speed and accuracy are tested again, so run the 80 in 8 and the Zap-N games in the days before. Think out loud. How you get to the answer is scored, so say your approach and your assumptions as you go.
What comes after the Cognitive Interview?
The Technical / Brain-Teaser (stage 5 of 8). Format: 60–75 min · Zoom whiteboard · with a researcher.
Practice the Optiver Cognitive Interview round
Work the 100 mapped practice problems with progress tracking, then move to the next stage of the Optiver funnel.