Software Engineer — OCaml, Python & Open-Source Impact

Jane Street is seeking software engineers to design and build the systems and tools that run the firm. You'll work across trading desks and accounting teams, building foundational infrastructure and solving real problems.

We value functional programming, using OCaml as our primary language, with Python playing a vital role in data analysis, visualization, and machine learning. We also contribute to open source and support projects like Mercurial and OPAM.