Jane Street interview questions

Class design question, develop some methods to solve a given problem

Companies: Jane Street

Last reported Dec 2025

System design interview: file system design Coding exercise: An immutable tree structure being hashed and compared to a remote via an API efficiently

System design interview: file system design Coding exercise: An immutable tree structure being hashed and compared to a remote via an API efficiently

Companies: Jane Street

Last reported Dec 2025

Given a list of events, find which user should be rate-limited. Then there are multiple follow-up questions after you're done with this.

Companies: Jane Street

Last reported Oct 2025

Design sequential reveal classification and policy

Companies: Jane Street

ML System Design

Last reported Sep 2025

Snakes and ladders variant coding question

Companies: Jane Street

Last reported Sep 2025

Was basically implementing a stack machine but got more complicated, like how to transform a program and add instructions to add a feature or something.

Companies: Jane Street

Last reported Sep 2025

Predict future time-series values

Companies: Jane Street

ML System Design

Last reported Aug 2025

Design an end-to-end training framework

Companies: Jane Street

ML System Design

Last reported Aug 2025

Given a basic API for a low level disk drive, implement a file system that can read and write.

Companies: Jane Street

Last reported May 2025

How would you design your solution differently if concurrency was a concern?

Companies: Jane Street

Last reported Aug 2024

Given an API for lower-level hard disk management, implement APIs for storing, retrieving, and error-correcting data in a higher-level storage device composed of three of the lower-level disks.

Given an API for lower-level hard disk management, implement APIs for storing, retrieving, and error-correcting data in a higher-level storage device composed of three of…

Companies: Jane Street

Last reported Jul 2024

The coding questions could be done in any language and didn't require specific tricks. The ML questions required a basic understanding of Pytorch

Companies: Jane Street

Last reported May 2024

Coding problems seemed more implementation intense, it seems the interviewers have a strong emphasis on writing clean, understandable code. Communication and collaborating with the interviewer also appears important, solving the problem perfectly doesn't seem to be as important as you might expect. One of the system design interviews was walking through a system you developed (I believe system design questions are only asked to lateral/experienced applicants). I was not asked any explicit behavioral questions outside of the typical ones you might expect when retrospecting during the "walk through a system you developed" interview. I am told Jane Street doesn't have behavioral rounds for engineers in general.

Coding problems seemed more implementation intense, it seems the interviewers have a strong emphasis on writing clean, understandable code. Communication and collaborating with…

Companies: Jane Street

Last reported Apr 2024

“What is the expected number of coin flips needed to get two heads in a row?”

Companies: Jane Street

2 Sum in leetcode question

Companies: Jane Street

Analyze trading RFQ competitiveness data

Companies: Jane Street

Metrics & KPIs · Regression & Statistical Modeling

Asked about previous work experience.

Companies: Jane Street

behavioural and coding questions and systems design

Companies: Jane Street

Bounds on the Probability of Rain on at Least One Weekend Day

Companies: Jane Street

Build out an ETF class and calculate fair values

Companies: Jane Street

Code 3 functions on Run Length Encoding

Companies: Jane Street

Creating a mini debugger for some made up language

Companies: Jane Street