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...
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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
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Introducing the Jane Street Graduate Research Fellowship
We are excited to announce the launch of the Jane Street Graduate Research Fellowship!
By: Emily Berger
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What the interns have wrought, 2022 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 interns accomplished while...
By: Yaron Minsky
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Research internships in our Tools and Compilers group
We are excited to announce research internships in our Tools and Compilers group.
By: Greta Yorsh
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How Jane Street Pairs Interns to Projects and Teams During the Software Engineering Internship
Software engineering intern candidates often ask how team placement works and how much input incoming interns have over their teams and projects. We know team...
By: Sydney Mitchell
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Magic-trace: Diagnosing tricky performance issues easily with Intel Processor Trace
Intel Processor Trace is a hardware technology that can record all program execution flow along with timing information accurate to around 30ns. As far as...
By: Tristan Hume
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Hiring a Developer Educator
We spend a lot of time on education at Jane Street. Like, really a lot.
By: Yaron Minsky
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Goodbye Core_kernel
We recently restructured our standard libraries at Jane Street in a way that eliminates the difference between Core_kernel and Core and we’re happy with the...
By: Jeremie Dimino
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What the interns have wrought, 2021 edition
It’s the end of another dev internship season, and this one marked something of a transition, since halfway through the season, NY-based interns were invited...
By: Yaron Minsky
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Looking for a developer experience engineer
This role has been filled
By: Ty Overby
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Growing the Hardcaml toolset
I am pleased to announce that we have recently released a slew of new Hardcaml libraries!
By: Andrew Ray
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Announcing Our Market Prediction Kaggle Competition
Jane Street is running a Kaggle contest based on a real problem with real financial data. If you like ML projects, or think you might,...
By: Craig Falls
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Finding memory leaks with Memtrace
Memory issues can be hard to track down. A function that only allocates a few small objects can cause a space leak if it’s called...
By: Luke Maurer
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Memory allocator showdown
Since version 4.10, OCaml offers a new best-fit memory allocator alongside its existing default, the next-fit allocator. At Jane Street, we've seen a big improvement...
By: Stephen Dolan
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Announcing Signals and Threads, a new podcast from Jane Street
I’m excited (and slightly terrified) to announce that Jane Street is releasing a new podcast, called Signals and Threads, and I’m going to be the...
By: Yaron Minsky
