A Higgs-bugson in the Linux Kernel
We recently ran across a strange higgs-bugson that manifested itself in a critical system that stores and distributes the firm’s trading activity data, called Gord....
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Introducing OxCaml
At Jane Street, we’ve been actively making improvements to OCaml for a long time. Over the last few years, we’ve started to build some fairly...
By: Leo White
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Advent of Hardcaml
Advent of Code is an annual Advent calendar featuring small programming puzzles created by Eric Wastl, which has been running every December since 2015. Being...
By: Anish Singhani
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How we accidentally built a better build system for OCaml
A “build system” is one of the most important tools in a developer’s toolbox. Roughly, it figures out how to create runnable programs from a...
By: Andrey Mokhov
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Developer education at Jane Street
Like most places, Jane Street largely teaches developers through a kind of apprenticeship model. A team matching process tries to thoughtfully match new devs to...
By: Aaron Bauer
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ICFP 2024
It’s no secret that Jane Street is an active participant in the programming language community, and we’re excited to be attending ICFP 2024, the International...
By: Nailen Matschke
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What the interns have wrought, 2024 edition
We’re once again at the end of our internship season, and it’s time do our annual review of what the interns achieved while they were...
By: Yaron Minsky
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Visualizing piecewise linear neural networks
Neural networks are often thought of as opaque, black-box function approximators, but theoretical tools let us describe and visualize their behavior. In particular, let’s study...
By: Ricson Cheng
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What the interns have wrought, 2023 edition
We’re once again at the end of our internship season, and it’s my task to provide a few highlights of what the dev interns accomplished...
By: Yaron Minsky
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Oxidizing OCaml: Data Race Freedom
OCaml with Jane Street extensions is available from our public opam repo. Only a slice of the features described in this series are currently implemented....
By: Max Slater
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We're sponsoring SoME3
Jane Street is excited to announce our sponsorship of SoME3, Grant Sanderson and James Schloss’s third Summer of Math Exposition. SoME is a contest that...
By: Craig Falls
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Oxidizing OCaml: Rust-Style Ownership
OCaml with Jane Street extensions is available from our public opam repo. Only a slice of the features described in this series are currently implemented....
By: Max Slater
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Oxidizing OCaml: Locality
OCaml with Jane Street extensions is available from our public opam repo. Only a slice of the features described in this series are currently implemented....
By: Max Slater
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Building reproducible Python environments with XARs
Our traders and researchers love Python for its agility and for its huge open-source ecosystem, especially when it comes to machine learning. But the heavy...
By: Pavel Senchanka
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What if writing tests was a joyful experience?
At Jane Street we use a pattern/library called “expect tests” that makes test-writing feel like a REPL session, or like exploratory programming in a Jupyter...
By: James Somers
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Accelerating zk-SNARKs - MSM and NTT algorithms on FPGAs with Hardcaml
In 2022 a consortium of companies ran an international competition, called the ZPrize, to advance the state of the art in “zero-knowledge” cryptography. We decided...
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Visualizing information propagation in markets
The Dojima rice market, established around 1716, is widely considered to be the world’s first organized futures exchange. Instead of directly exchanging money for rice...
By: Ricson Cheng
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Computations that differentiate, debug, and document themselves
One of the problems we wrestle with at Jane Street is how to understand and manage the costs associated with the positions we hold: things...
By: Aditya Srinivasan
