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...
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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
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What the interns have wrought, 2020 edition
It’s been an unusual internship season.
By: Yaron Minsky
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The Jane Street Interview Process — 2020 Edition
We’re busy preparing for our software engineering fall hiring season. Over the years we’ve done our best to make our interview process more transparent to...
By: Sam DeFabbia-Kane
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Really low latency multipliers and cryptographic puzzles
At Jane Street, we have some experience using FPGAs for low-latency systems–FPGAs are programmable hardware where you get the speed of an application-specific integrated circuit...
By: Benjamin Devlin
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Using ASCII waveforms to test hardware designs
At Jane Street, an “expect test” is a test where you don’t manually write the output you’d like to check your code against – instead,...
By: Andrew Ray
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Chrome extensions: Finding the missing proof
Web browsers have supported custom plug-ins and extensions since the 1990s, giving users the ability to add their own features and tools for improving workflow...
By: Mark R. Bannister
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Watch all of Jane Street's tech talks
Jane Street has been posting tech talks from internal speakers and invited guests for years—and they’re all available on our YouTube channel:
By: James Somers
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Troubleshooting systemd with SystemTap
When we set up a schedule on a computer, such as a list of commands to run every day at particular times via Linux cron...
By: Mark R. Bannister
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Using Python and OCaml in the same Jupyter notebook
The cover image is based on Jupiter family by NASA/JPL.
By: Laurent Mazare
