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Jane Street

Software Engineer

London, England, United Kingdom
Level
Mid

Not stated in the posting: salary, work type, visa.

Open. First seen 3 October 2026.

About the role

About the Position

We're always hiring software engineers for all of our offices. Technology is at the core of how we approach our work, and engineers are intimately involved in every area of the business.

We are big believers in functional programming and use OCaml, a statically typed functional programming language, as our primary tool. More recently, Python has become a vital part of Jane Street’s research and trading work, acting as the go-to language for data analysis, visualization, and machine learning.

We also believe in the value of open source software, using it in our daily work and releasing over a million lines of our own code as open source.

About You

  • Top-notch programming skills
  • Deep experience with—and love for—technology. There's no specific checklist; we use software to approach a variety of problems, so we're interested in everything from machine learning to systems administration to programming language design
  • Strong interpersonal skills. Software engineering at Jane Street is highly collaborative, and we are looking for people who can work effectively in small, close-knit teams
  • We don’t expect you to have experience with functional programming, OCaml, Python, or finance; we’re happy to hire talented engineers and teach them what they need to know.
  • Fluency in English required

If you'd like to get an idea of what we cover in our software engineering interview process, you can visit our interview prep page.

Jane Street's standard text

If you're a recruiting agency and want to partner with us, please reach out to agency-partnerships@janestreet.com.

What this role asks for

Standard for software engineering roles

Python

Common in software engineering postings at any company.

93% of this description is written for the role. The rest is Jane Street's standard text, folded away below.

Read against Jane Street's other open postings on this site.

The team: Software Engineering

This role is one of 47 open in Software Engineering.

WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS

Python (22 of 47), Machine Learning (8 of 47), FPGA (6 of 47), SQL (6 of 47), C++ (5 of 47), Haskell (4 of 47), Jira (4 of 47)

OTHER ROLES ON THIS TEAM

From the team and dates on Jane Street's own job board.

Other openings for this role

3 open postings for this role in London, England, United Kingdom, first posted 3 October 2026. The company is likely hiring for more than one position. None has been taken down and posted again.

Salary context

214 other open postings titled Software Engineer state a salary: median USD 140,000 to USD 200,000 a year.

See Software Engineer salaries in London →

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