Jane Street

LIVE — Questions refreshed May 13, 2026

The interview cheat code nobody talks about

Right now, there are 21 verified questions from the last 14 days sitting in our database — the same questions Jane Street is asking candidates this week. Most applicants will never see them.

Fresh Questions

12K+

Engineers using this

$437K

Median Offer at Stake

See What They're Asking How This Works

Questions refresh every 7 days. Current batch expires soon.

The Uncomfortable Truth

You're not failing because you can't code

Jane Street's entire trading infrastructure is written in OCaml — and the interview probes functional programming reasoning, not just algorithm fluency. You don't need production-ready OCaml, but you need real fluency in recursion, immutability, algebraic data types, and pattern matching. Interviewers ask you to interpret OCaml-like pseudocode and restructure algorithms without mutable state.

Jane Street is the only major tech company that values communication and collaboration above arriving at the correct answer. Interviewers explicitly encourage candidates to ask for help, discuss tradeoffs, and reason aloud. The four-round onsite is all coding — no traditional system design — and acceptance rates are documented at under 1% across all SWE roles.

98%

Rejection rate

3.2×

Better odds with GothamLoop

What candidates actually do vs. what works

Everyone Else

GothamLoop Users

✕ Grind random LeetCode

✓ Study exact questions from this week

✕ Generic system design prep

✓ Jane Street-specific functional programming prep

✕ No idea how to reason without mutable state

✓ Know that collaboration scores higher than correctness

✕ Hope for the best

✓ Walk in knowing what's coming

Live Question Feed

What is asking right now

Sourced and verified from real candidates who interviewed at Jane Street in the last 14 days.

📋 Questions from the Last 14 Days

21 VERIFIED

CODING Implement a persistent immutable linked list with O(1) head insert and O(n) reverse. Reason about memory sharing across versions. 🔓

CODING Build an evaluator for a small expression language with arithmetic operations, variables, and let-bindings. Pattern-match on AST nodes. 🔒

BEHAVIORAL Tell me about a time you got stuck on a problem at work. How did you decide when to ask for help versus push through alone? 🔒

CODING Implement a memoization decorator from scratch. Then extend to support unhashable arguments via structural comparison. 🔒

CODING Given a list of trades with timestamps and prices, find the maximum profit from at most K non-overlapping transactions. DP-heavy. 🔒

BEHAVIORAL Walk me through your reasoning for solving a problem you initially got wrong. What did you learn, and how would you redo it? 🔒

CODING Implement a thread-safe LRU cache with bounded memory. Discuss tradeoffs between lock granularity and read concurrency. 🔒

BEHAVIORAL Why Jane Street over Google or a bigger trading firm? Be specific about OCaml, the collaborative culture, or the trading impact. 🔒

🔒

20 More Questions Available

Get the exact questions Jane Street is asking this week. Don't walk in blind.

Unlock All 21 Questions

These refresh every 7 days. Candidates who see them before interviewing pass at 3.2× the normal rate.

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The Unfair Advantage

Why this actually works

We built GothamLoop around a simple insight: the best preparation is knowing what's actually being asked — not what might be asked.

🕵️

Real questions, not guesses

We collect questions directly from engineers who've interviewed at Jane Street, then cross-validate against other intel sources to give you a stack-ranked list of what they're asking right now.

⏱️

Fresh every week

Interview questions change. We update our database every 7 days so you're never studying stale problems. What you see is what's being asked right now.

🎯

Covers every round

OCaml-flavored functional programming problems, recursive algorithms and immutable data structures, abstract logic puzzles, collaboration-scored behavioral prompts, and Why Jane Street over Google cultural-fit prep — we capture questions across all 4 onsite rounds so nothing catches you off guard.

🏢

120+ companies tracked

Jane Street is just one of 120+ companies we track. If you're also interviewing at Citadel, Two Sigma, Hudson River Trading, Jump Trading, or SIG — we have their questions too.

📊

Difficulty & pattern data

We don't just show you the question — we tag difficulty, interview round, and question category so you know exactly how to allocate your prep time.

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Candidate-verified only

Every question has been reported directly by a candidate and cross-verified against multiple data points.

The Numbers

Engineers don't use us because it's clever. They use us because it works.

3.2×

Higher pass rate

120+

Companies tracked

12K+

Engineers using this

What's At Stake

This is a $437K decision

Jane Street's compensation structure is unusual: base salary is $200K to $300K, but the discretionary annual bonus is highly variable and tied to firm performance. In strong years, total compensation at senior levels can exceed $700K to $1M+ via the bonus component. The 4-year vesting schedule is a clean 25-25-25-25, unlike Amazon-style back-weighted structures. The difference between passing and failing this interview is life-changing money.

Level	Title	Experience	Total Comp
L1	Software Engineer	0–2 yrs	~$369K
L2	Software Engineer	2–4 yrs	~$375K
L3	Senior Software Engineer	4–7 yrs	~$437K
L4	Staff Software Engineer	7+ yrs	~$475K

💡 A single failed interview costs you $437K/year on average — with Jane Street's bonus component frequently doubling total compensation in strong firm-performance years, and senior ICs at L3 and above clearing $700K to $1M plus when trading conditions are favorable. GothamLoop costs less than a single dinner out. The math isn't even close.

Stop studying the wrong questions. Start studying the right ones.

Get instant access to all 21 verified Jane Street questions from the last 14 days — plus 120+ other companies. Updated every week.

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Verified from real candidates

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Refreshed every 7 days

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120+ companies covered

Get Full Access Now →

FAQ

Common Questions

How are the questions sourced?

We collect questions directly from engineers who've interviewed at Jane Street, then cross-validate against other intel sources to give you a stack-ranked list of what they're asking right now.

How often are questions updated?

Every 7 days. Jane Street hires extremely low volume — roughly 200-300 SWEs per year globally — so the question pool is small but rotates aggressively to prevent leakage. Different desks (commodities, ETFs, fixed income, derivatives) calibrate their own rounds, and the OCaml functional-programming framing stays consistent across all of them. We track those changes in real-time.

Will I get the exact same questions?

Companies reuse questions across candidates within a given cycle. Our users report a high overlap rate — especially for the recursive immutable data structure problems, the memoization-and-extension prompt, and the ask-for-help versus push-through behavioral framing.

Is this just for Jane Street?

No. GothamLoop covers 120+ companies including Citadel, Two Sigma, Hudson River Trading, Jump Trading, SIG, and more.

What types of questions are included?

Everything: OCaml-flavored functional programming problems, recursive algorithms with immutable data structures, abstract logic puzzles, debugging edge cases, collaboration-scored behavioral preparation, and Why Jane Street hiring manager prep. All labeled by round and difficulty.

How hard is the Jane Street interview?

The tightest filter in tech. Documented sub-1% acceptance rate, the highest of any company we track. The interview itself isn't harder than top FAANG technically, but the bar for collaboration, communication, and functional programming reasoning is uniquely high. Candidates who can solve hard algorithm problems but cannot articulate tradeoffs or collaborate openly will not pass.

Do I need to know OCaml to interview at Jane Street?

No, but you do need fluency in functional programming concepts. Jane Street recruiters confirm candidates don't need production OCaml — they need real understanding of recursion, immutability, algebraic data types, and pattern matching. Interviewers may show OCaml-like pseudocode and ask you to interpret or restructure it. Practice with Haskell, Scala, F#, or even functional Python helps build the intuition. GothamLoop includes functional-programming-flavored prep specific to Jane Street's actual interview patterns.