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Jane Street is known for being an OCaml shop, but for years now Python has been our second major programming language, acting as the primary tool for data an...

I recently ported the Hardcaml_step_testbenchlibrary, one of the libraries thatwe use at Jane Street for Hardcaml simulations, from using monads to using alg...

Advent of Code has long been a favorite Decemberritual at Jane Street, with many participating in the month-long puzzle challenge thatencourages thoughtful e...

At Jane Street, we’ve been actively making improvements to OCaml for a long time. Over thelast few years, we’ve started to build some fairly ambitious extens...

Advent of Code is an annual Advent calendarfeaturing small programming puzzles created by Eric Wastl, which has been runningevery December since 2015. Being ...

A “build system” is one of the most important tools in a developer’stoolbox. Roughly, it figures out how to create runnable programs froma bunch of different...

Like most places, Jane Street largely teaches developers through a kind of apprenticeshipmodel. A team matching process tries to thoughtfully match new devs ...

It’s no secret that Jane Street is an active participant in the programming languagecommunity, and we’re excited to be attending ICFP 2024, theInternational ...

We’re once again at the end of our internship season, and it’s time do our annual reviewof what the interns achieved while they were here.

Neural networks are often thought of as opaque, black-box function approximators, but theoretical tools let us describe and visualize their behavior. In part...