Coding fluency
Implement an LRU cache. Explain your data structures, test capacity one, and walk through an eviction.
What a strong answer demonstrates
Correctness, edge cases, and time / space complexity.
Prepare for Jane Street with a focused mix of coding, design, and communication. Start with your job description and confirm the interview loop with your recruiter.
6 Practice picks
3 Interview reports
5 Levels mapped
01 / MAKE YOUR NEXT SESSION COUNT
Your preparation, made concrete.
System design
Design a notification service. Clarify delivery guarantees, model the data, then handle retries and duplicate events.
What a strong answer demonstrates
Clear requirements, a working baseline, and explicit trade-offs.
Behavioral storytelling
Describe a technical decision you changed after receiving feedback. Explain your contribution and the outcome.
What a strong answer demonstrates
Specific actions, honest reflection, and measurable impact.
BEFORE YOU PRACTICE
Ask your recruiter.
Get the details that a generic company guide cannot know.
- Which team and level is this opening for, and what does success look like?
- What rounds, durations, and evaluation criteria should I prepare for?
- Which languages, tools, and AI assistance are permitted?
- Will design focus on frontend, backend, infrastructure, or another specialty?
- Are there accommodations or preparation materials I should request?
Jane Street practice problems
Company-linked challenges and related lessons from our library. Not a prediction of your interview.
Challenge
Difficulty 8/10
Serialize and Deserialize a Binary Tree
Challenge
Difficulty 3/10
Single Lonely Number
Challenge
Difficulty 5/10
Stock Buy and Sell Optimization
Challenge
Difficulty 5/10
Decimal To Binary
Challenge
Difficulty 8/10
Course Prerequisites
Challenge
Difficulty 7/10
Hoisting and Call Stack
Real interview experiences
3 reports from candidates who interviewed at Jane Street.
What people at Jane Street say
Reviews originally posted on Glassdoor.
The colleagues are great and the salary is one of the best for an internship!
A good salary. Besides, it is a financial company emphasizing on technology. Work rotation between New York, London, Hong Kong is very good.
Great compensation & People to work with, interesting problems to solve, work never becomes routine
Amazingly smart and hard working co-workers
Smart coworkers and interesting tech problems
Inside the workplace
About Jane Street
A day at Jane Street