Citadel Super Day Coding Interview

What the round is, what Citadel asks, and how to prepare, from candidate reports and the QuantVault practice set.

Stage 6 of 860 min17 practice problemsUpdated October 20, 2026

The Citadel Super Day Coding interview is stage 6 of 8 in the Citadel interview process, after the Super Day Quantitative Math. Format: 60 min · CoderPad (Python preferred). C++/Python emphasis; correctness, edge cases, and complexity under time pressure.

Preparing for this round? Practice the 17 questions mapped to the Citadel Super Day Coding, with worked solutions. A free account saves your progress.

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What the Super Day Coding tests

QuantVault maps 17 practice problems to this round. By topic, the biggest groups are coding (16), time series (1); by difficulty, 0 easy, 7 medium and 10 hard. 17 of them were reported by candidates who interviewed at Citadel, most recently in Jun 2026.

  • Engineering candidates do three 45-minute technical interviews after the CoderPad round.

How to prepare for the Super Day Coding

  • The refactor part is graded as much on questions you ASK as code you write.

Further reading: How quant superdays work · C++ and low-latency interview questions · Behavioral questions at trading firms · Market-making game interview guide.

Question types in this round

The 2 largest question types in the Citadel Super Day Coding practice set; across them the most common sub-topics are data structures, complexity analysis, sorting and searching, two pointers and sliding windows, dynamic programming, divide and conquer. The questions themselves, with worked solutions, are in the round practice.

Coding16 in this round

How coding questions work →

Time Series1 in this round

How time series questions work →

Prepare with QuantVault

PracticePractice the Super Day Coding round17 mapped problems, 4 freeInterview funnelAll 8 Citadel roundsThe full funnel, a practice set for each stageFirm guideCitadel interview guideEvery round, tracks, timeline, pay and a prep planFree OA sampleCitadel / Citadel Securities QR / QT OA2 questions, 5 min, no signupProblem setCitadel interview questionsEvery question tagged to this firmRelated problemsCoding interview questionsWorked solutionsCourseQuant coding course9 lessonsNext roundSuper Day ML / Statistics60 min · whiteboard

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Frequently asked questions

What is the Citadel Super Day Coding interview?

It is stage 6 of 8 in the Citadel interview process, after the Super Day Quantitative Math. Format: 60 min · CoderPad (Python preferred). C++/Python emphasis; correctness, edge cases, and complexity under time pressure.

How long is the Citadel Super Day Coding interview?

Candidates report: 60 min · CoderPad (Python preferred).

What questions come up in the Citadel Super Day Coding interview?

The practice set QuantVault maps to this round centers on coding, time series.

How should I prepare for the Citadel Super Day Coding interview?

The refactor part is graded as much on questions you ASK as code you write.

What comes after the Super Day Coding?

The Super Day ML / Statistics (stage 7 of 8). Format: 60 min · whiteboard.

Practice the Citadel Super Day Coding round

Work the 17 mapped practice problems with progress tracking, then move to the next stage of the Citadel funnel.

Practice the Super Day Coding round Create a free account Citadel interview guide Citadel online assessment All 8 rounds