The Jane Street Super Day Afternoon interview is stage 6 of 6 in the Jane Street interview process, after the Super Day Morning. Format: Onsite - coding + data-science rounds (if you advance). Candidates who clear the morning games move to the afternoon: hands-on coding problems and data-science / statistics questions (clean implementation, reasoning about data, light modelling).
Preparing for this round? Practice the 99 questions mapped to the Jane Street Super Day Afternoon, with worked solutions. A free account saves your progress.
What the Super Day Afternoon tests
There is no separate final wrap-up - the whole day is one long super-round of back-to-back interviews, and this technical block is the last of it.
QuantVault maps 99 practice problems to this round. By topic, the biggest groups are coding (36), statistics (21), regression (11), time series (9); by difficulty, 5 easy, 39 medium and 55 hard. 27 of them were reported by candidates who interviewed at Jane Street, most recently in Feb 2026.
- Jane Street lists coding (in any language) and data analysis among final-round topics.
Who takes this round: Quant Trader candidates. See the full Jane Street process and who takes each round.
How to prepare for the Super Day Afternoon
- Write clean, correct code and talk through edge cases; production work is OCaml-flavored but the round is language-flexible.
- For the data-science part, be ready to reason about a dataset and justify a simple model, not just recite theory.
Final-week checklist
- Play 30 min of an online market-making game.
- Re-derive E[T] for two competing Poisson processes.
- Pick 3 recent market events you can speak to in 90 seconds each.
Further reading: How quant superdays work · Behavioral questions at trading firms · Market-making game interview guide.
Question types in this round
The 5 largest question types in the Jane Street Super Day Afternoon practice set; across them the most common sub-topics are data structures, hypothesis testing, complexity analysis, variance, Bayes' theorem, maximum likelihood. The questions themselves, with worked solutions, are in the round practice.
Coding36 in this round
Statistics21 in this round
Regression11 in this round
Time Series9 in this round
Expectation5 in this round
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Frequently asked questions
What is the Jane Street Super Day Afternoon interview?
It is stage 6 of 6 in the Jane Street interview process, after the Super Day Morning. Format: Onsite - coding + data-science rounds (if you advance). Candidates who clear the morning games move to the afternoon: hands-on coding problems and data-science / statistics questions (clean implementation, reasoning about data, light modelling). There is no separate final wrap-up - the whole day is one long super-round of back-to-back interviews, and this technical block is the last of it.
What questions come up in the Jane Street Super Day Afternoon interview?
The practice set QuantVault maps to this round centers on coding, statistics, regression.
How should I prepare for the Jane Street Super Day Afternoon interview?
Write clean, correct code and talk through edge cases; production work is OCaml-flavored but the round is language-flexible. For the data-science part, be ready to reason about a dataset and justify a simple model, not just recite theory.
What comes after the Super Day Afternoon?
Nothing: it is the last of the 6 stages QuantVault maps for Jane Street.
Practice the Jane Street Super Day Afternoon round
Work the 99 mapped practice problems with progress tracking, then move to the next stage of the Jane Street funnel.