Trading
Practise probability and expected value out loud. Make your assumptions clear.
Prepare for Jane Street interviews
Jane Street trading interviews are conversational and problem based. Expect probability, expected value, logic and market-making questions with follow-ups as you work.
Collaborative reasoning
Probability
Expected value
Markets
Coding
Recruiting context
About Jane Street interviews
Jane Street interviews put a lot of weight on how you reason through a problem with the interviewer. Clear explanations, good assumptions and calm responses to hints matter.
For trading, focus on probability, expected value, logic and market making. You should be comfortable thinking aloud, asking clarifying questions and changing your approach when new information appears.
Finance knowledge is not the main focus for trading roles. Software engineering is much more coding-heavy, so use the engineering guide if that is your stream.
Interview style
Use hints, correct mistakes and keep your reasoning easy to follow.
Engineering
Make coding and technical problem solving the centre of your engineering preparation.
Prepare deliberately
Choose your Jane Street preparation path
Different roles reward different preparation. Start with the closest path, then use the resource sections below.
Path 1
Quantitative Trading
Practise solving problems as a conversation.
- 1
Start with the Jane Street trading guide.
- 2
Build strong probability and expected-value fundamentals.
- 3
Work through questions out loud and state your assumptions clearly.
- 4
Add statistics, data or coding practice if it is relevant to your role.
Path 2
Software Engineering
Focus on coding and technical problem solving.
- 1
Use the Jane Street software-engineering guide as your base.
- 2
Practise writing and discussing code clearly.
- 3
Pay attention to correctness, complexity and technical trade-offs.
Interview practice
Jane Street interview questions
Use the question bank for probability, expected value and market-style problems. Work through the questions out loud.
Role-specific direction
Jane Street interview guides
Choose the guide for trading or software engineering. The interview style overlaps, but the technical content is different.
Trading guide
Quantitative Trading at Jane Street
Go deeper on the trading process, probability and expected value, and how to practise the firm's conversational problem-solving style.
Engineering guide
Software Engineering at Jane Street
Prepare for programming and technical reasoning while keeping explanations clear enough to support an active back-and-forth.
Fill the gaps
Strengthen the underlying skills
Firm-specific preparation works best on top of solid fundamentals. Use these only where they address a real weakness in your preparation.
Common questions
Jane Street interview preparation FAQ
Short answers for broad questions; use the dedicated guides, assessment tools and interview-question bank for deeper practice.
Do I need a finance background for a Jane Street trading interview?
No. Trading interviews focus much more on probability, expected value, logic and problem solving. You should still understand basic market ideas used in the interview.
Is Jane Street mainly a mental-maths interview?
No. Numerical comfort helps, but the interview is more about clear reasoning, communication and adapting as the problem develops.
What probability topics should I know for Jane Street?
Focus on probability, expected value and market-making basics. Practise applying them to unfamiliar problems instead of memorising a fixed list of puzzle types.
How is Jane Street software-engineering preparation different?
Software engineering needs much more coding and technical depth. Keep the collaborative problem-solving style, but make programming the main part of your preparation.
Keep moving
Turn the plan into practice.
Start with the Jane Street question bank, then work through the specific assessment or role guide that matches your next stage.