Verified by our engine · Posted 3mo ago

Jane Street

Software Engineer

Jane Street · Software Engineering

London

Mid-level Still listed after 3 months

SoftwarePython

Last seen 3h ago

Posted
3mo ago

Posted on 3 August 2026

Workplace
Not specified

Work model not stated

Salary
Not disclosed

Salary range not shared by the company

Visa sponsorship
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Visa sponsorship details unknown

Listing history First seen 60+ days ago
  • First seen 60+ days ago. We first saw this listing on 10 Sept 2026. That is when we found it, not necessarily when it was posted.

First seen 10 Sept 2026. Last checked 11 Nov, 02:17 UTC. We read each employer's own career page on a cycle and record what changes; this is what we observed, not a verdict on the role.

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About the Position

Our goal is to give you a real sense of what it's like to work at Jane Street full time while also providing a truly unparalleled educational experience. As an intern, you are paired with full-time employees who act as mentors, collaborating with you on real-world projects we actually need done.

As a Software Engineering intern, you'll learn how we use OCaml (our primary development language) in our day-to-day work, and gain exposure to the libraries and tools that are foundational to our internal systems. Some teams also use Python, so depending on the project, you might do some work with Python as well.

During the internship, you'll be closely mentored by full-time software engineers. Mentors design intern projects based on their team's current needs and are heavily invested in helping interns build maintainable, high-quality software that is intended to reach production. The projects you will work on are as varied and diverse as those full-timers work on, covering a wide range of problems, from high-performance trading systems to programming language design and everything in between.

If you’d like to learn more, you can read about our interview and team placement processes and get a sense of what our most recent intern projects looked like! You can also learn more about Jane Street’s internship program here.

About You

If you've never thought about a career in finance, you're in good company. Many of us were in the same position before working here. If you have a curious mind, a collaborative spirit, and a passion for solving interesting problems, we have a feeling you'll fit right in. We're more interested in how you think and learn than what you currently know. You should be:

A top-notch programmer with a love for technology

Intellectually curious, collaborative, and eager to learn

Humble and unafraid to ask questions and admit mistakes

Fluent in English

About Jane Street

Jane Street's European postings are all London. It's a proprietary trading firm building its own trading and research infrastructure in OCaml — the interview process is famously technical, and the roles here are engineering, not finance, despite the industry.

Apply at Jane Street