Jane Street interview questions

52 questions31 coding5 system design16 behavioral11 freeUpdated

This is every question in the Jane Street guide, in one list: 31 coding problems, 5 system designs and 16 behavioral questions, drawn from what candidates report about Jane Street interviews.

Each row shows the round it comes from and links to the lesson that works through it. 11 are free to read in full. The other 41 are Premium, and here you still see their round, difficulty and topic, so you know what you're walking into.

Jane Street coding interview questions

31 problems, in the order the guide teaches them. Each lesson gives the full problem, a worked solution and the follow-ups interviewers tend to add.

1Consecutive Failures: One-Pass SimulationFreeMediumArrays, Intervals & Stacks
2Reschedule Meetings: Maximize a Free BlockFreeMediumArrays, Intervals & Stacks
3Decode String: Stack Over a Nested FormatFreeMediumArrays, Intervals & Stacks
4Decode Ways: Recursion With a MemoFreeMediumDynamic Programming
5Unique Paths With Obstacles: Two-Dimensional RecursionFreeMediumDynamic Programming
6Word Break: Recursion Over a StringFreeMediumDynamic Programming
7Memoize, Then Evict: LRU CacheFreeMediumThe Implementation Round
8Connect Four, Generalized to Connect KFreeMediumThe Implementation Round
9Ring Buffer: A Rolling Window of StateFreeMediumThe Implementation Round
10Merkle Tree: Build, Then Prove a LeafFreeMediumThe Implementation Round
11Premium hard problemHardOrder Books & Simulations
12Premium medium problemMediumOrder Books & Simulations
13Premium hard problemHardOrder Books & Simulations
14Premium medium problemMediumStreams & Incremental State
15Premium medium problemMediumStreams & Incremental State
16Premium medium problemMediumStreams & Incremental State
17Premium medium problemMediumStreams & Incremental State
18Premium medium problemMediumStreams & Incremental State
19Premium medium problemMediumStreams & Incremental State
20Premium medium problemMediumParsers & Interpreters
21Premium hard problemHardParsers & Interpreters
22Premium medium problemMediumParsers & Interpreters
23Premium medium problemMediumParsers & Interpreters
24Premium medium problemMediumParsers & Interpreters
25Premium easy problemEasyInterfaces & Abstractions
26Premium hard problemHardInterfaces & Abstractions
27Premium medium problemMediumInterfaces & Abstractions
28Premium medium problemMediumProbability & Expected Value
29Premium medium problemMediumProbability & Expected Value
30Premium hard problemHardProbability & Expected Value
31Premium hard problemHardProbability & Expected Value

Jane Street system design interview questions

5 designs, each worked end to end in its own lesson, from requirements to the architecture and its trade-offs.

#Question
1Design a Matching EngineFree
2Design a Market Data System (Premium)
3Design an Execution System (Premium)
4Design a Research Data Store (Premium)
5Design a Backtesting Framework (Premium)

A lock means the design is named here and its walkthrough is Premium.

Jane Street behavioral interview questions

16 questions, grouped by what the interviewer is testing. The lesson explains why each one gets asked and what a strong answer covers.

Curiosity, and why Jane Street (4)

All 4 are Premium

How you think when you are stuck (3)

All 3 are Premium

Collaboration and the flat hierarchy (3)

All 3 are Premium

Honesty, feedback, and mistakes (3)

All 3 are Premium

Handling being wrong (3)

All 3 are Premium

Read the Jane Street behavioral questions

See all 52 Jane Street questions by name

Premium opens the 41 locked questions on this page, each with the full prompt and a worked answer, and every other lesson in all 100 company guides.

Common questions

How many questions are in the Jane Street interview guide?

52: 31 coding problems, 5 system designs and 16 behavioral questions. The guide was last updated in November 2026.

Which rounds do these Jane Street interview questions come from?

All 31 coding problems come from the coding rounds. The 5 system designs and 16 behavioral questions come from the system design and behavioral rounds. Every row in the list carries its round, so you can start with the one you have booked.

Which Jane Street interview questions are free?

11 of the 52 are free to read in full, marked Free in the list. The other 41 come with Premium, which also opens all 100 company guides.