Unlocking the Secrets: Jane Street Interview Questions from Reddit

Are you aspiring to join the ranks of Jane Street, one of the world’s premier quantitative trading firms? If so, you’re likely scouring the internet for insights into the interview process. Fortunately, the vibrant Reddit community has served as a treasure trove of information, with candidates sharing their experiences and insights. In this article, we’ll delve into the captivating world of Jane Street interview questions, drawing from the collective wisdom of Reddit users.

The Quantitative Trader (QT) Role

One of the most sought-after positions at Jane Street is the Quantitative Trader (QT) role. This role demands a unique blend of technical prowess, problem-solving skills, and a deep understanding of financial markets. Reddit users have shared valuable insights into the types of questions asked during the QT interview process.

Phone Interview

The phone interview is often the first hurdle in the Jane Street recruitment process. According to Reddit user u/Realistic_Salary5090, the phone interview for the QT role focuses heavily on coding challenges and algorithmic problem-solving. Candidates can expect questions that test their ability to think critically, optimize code, and devise efficient solutions.

A common question shared by multiple Reddit users involves implementing a data structure or algorithm from scratch, such as a hash table or a binary search tree. Additionally, candidates may be asked to solve problems related to dynamic programming, graph theory, or other algorithmic domains.

On-Site Interview

For those who clear the phone interview, the on-site interview at Jane Street’s offices awaits. Reddit user u/quant_alpha_dude shared their experience with the final round interview, describing it as a grueling process spanning several hours.

One of the key components of the on-site interview is the technical interview, which typically involves coding challenges and problem-solving questions. According to Reddit users, these questions may delve into topics such as:

  • Algorithmic Complexity: Candidates may be asked to analyze the time and space complexity of algorithms or optimize existing code for better performance.
  • Data Structures: Expect questions that test your understanding of various data structures, such as trees, graphs, and hash tables, and their practical applications.
  • Systems Design: Some candidates have reported being asked to design a system or component from scratch, requiring them to consider scalability, performance, and fault tolerance.

In addition to the technical interview, candidates may also face a quantitative finance interview, where their knowledge of financial concepts, models, and trading strategies is put to the test. Reddit user u/quant_interview_prep shared insights into the types of questions asked in this round, including:

  • Derivatives Pricing: Candidates may be asked to derive pricing formulas for various financial derivatives, such as options or futures.
  • Risk Management: Questions may focus on measuring and managing risk in trading strategies or portfolios.
  • Quantitative Strategies: Candidates may be asked to design or critique quantitative trading strategies, demonstrating their understanding of market dynamics and quantitative techniques.

Advice from Reddit Users

Beyond sharing specific interview questions, Reddit users have also offered valuable advice for those preparing for Jane Street interviews. Here are some key takeaways:

  • Practice, Practice, Practice: Reddit users unanimously emphasize the importance of practicing coding challenges, algorithmic problems, and quantitative finance concepts before the interview.
  • Brush up on Fundamentals: Ensure a solid grasp of computer science fundamentals, such as data structures, algorithms, and computational complexity, as these form the backbone of many interview questions.
  • Stay Up-to-Date: Keep abreast of the latest developments in quantitative finance, trading strategies, and risk management techniques, as Jane Street values candidates with a deep understanding of the industry.
  • Think Out Loud: During coding challenges, verbalize your thought process and communicate clearly with the interviewer, as they value your problem-solving approach as much as the final solution.
  • Ask Clarifying Questions: Don’t hesitate to ask clarifying questions if any part of the problem statement is unclear, as this demonstrates your analytical mindset and attention to detail.


Navigating the Jane Street interview process can be a daunting task, but by leveraging the insights and experiences shared on Reddit, you can better prepare yourself for the challenges ahead. Remember, Jane Street seeks candidates with exceptional technical abilities, quantitative finance knowledge, and a passion for problem-solving. By diligently practicing, mastering the fundamentals, and staying up-to-date with industry developments, you can increase your chances of success and potentially secure your dream role at this prestigious quantitative trading firm.

A Jane Street Trading Mock Interview with Graham and Andrea


What should I study for Jane Street interview?

Jane Street Hiring Process These interviews focus on probability theory, game theory, critical thinking, and problem-solving questions, with some roles requiring coding exercises. Interviewers are generally friendly and encourage candidates to think aloud and use intuition over formulas.

Are Jane Street interviews hard?

Is it hard to get hired at Jane Street? Glassdoor users rated their interview experience at Jane Street as 61.5% positive with a difficulty rating score of 3.57 out of 5 (where 5 is the highest level of difficulty).

How many rounds of interviews are there for Jane Street?

4 rounds, first there are 3 rounds of phone interview, and then there is the on site interview. The interview questions are hard and I have been thinking about the solutions for a long time… On site: chip games, bidding games.

How hard is it to get a job at Jane Street?

Standards are very high, however; you’ll need some solid previous internships or something like an impressive Math Olympiad record to catch its eye… and of course be attending one of its target universities.

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