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Jane Street Tech Blog

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2026

A resilient kernel log reporteroriginal ↗
1 Oct 2026
A FUSE server for our in-house storage backendoriginal ↗
1 Oct 2026
What the interns have wrought, special jumbo 2026 editionoriginal ↗
30 Sept 2026
What the SP interns have wrought, 2026 editionoriginal ↗
30 Sept 2026
Trading off compute for memory with activation checkpointingoriginal ↗
30 Sept 2026
What the TDOE interns have wrought, 2026 editionoriginal ↗
30 Sept 2026
Mitigating memorization in LLMsoriginal ↗
30 Sept 2026
Can you use autoregressive diffusion to generate market data?original ↗
30 Sept 2026
A study of sequence weighting at scaleoriginal ↗
14 Sept 2026
Can you design a chip? Announcing the protocol emulator ASIC competitionoriginal ↗
10 Sept 2026
Can you reverse engineer an ASIC?original ↗
5 Aug 2026
Using OxCaml to implement type-safe reference counting between OCaml and Pythonoriginal ↗
15 Jun 2026
Formal methods and the future of programmingoriginal ↗
7 Jun 2026
strace-ui, Bonsai_term, and the TUI renaissanceoriginal ↗
26 May 2026
Using group theory to explore the space of positional encodings for attentionoriginal ↗
22 Apr 2026
Can you reverse engineer our neural network?original ↗
24 Feb 2026
Results from the Advent of FPGA Challengeoriginal ↗
11 Feb 2026
I design with Claude more than Figma noworiginal ↗
5 Feb 2026
Fun with Algebraic Effects - from Toy Examples to Hardcaml Simulationsoriginal ↗
6 Jan 2026

2025

Getting from tested to battle-testedoriginal ↗
3 Dec 2025
Advent of FPGA — A Jane Street Challengeoriginal ↗
24 Nov 2025
What the interns have wrought, 2025 editionoriginal ↗
27 Aug 2025
A Higgs-bugson in the Linux Kerneloriginal ↗
2 Jul 2025
Introducing OxCamloriginal ↗
14 Jun 2025
Advent of Hardcamloriginal ↗
22 Mar 2025
How we accidentally built a better build system for OCamloriginal ↗
24 Jan 2025

2024

Developer education at Jane Streetoriginal ↗
4 Oct 2024
ICFP 2024original ↗
29 Aug 2024
What the interns have wrought, 2024 editionoriginal ↗
26 Aug 2024
Visualizing piecewise linear neural networksoriginal ↗
22 Jul 2024

2023

What the interns have wrought, 2023 editionoriginal ↗
12 Sept 2023
Oxidizing OCaml: Data Race Freedomoriginal ↗
1 Sept 2023
We're sponsoring SoME3original ↗
6 Jul 2023
Oxidizing OCaml: Rust-Style Ownershiporiginal ↗
21 Jun 2023
Oxidizing OCaml: Localityoriginal ↗
26 May 2023
Building reproducible Python environments with XARsoriginal ↗
14 Apr 2023
What if writing tests was a joyful experience?original ↗
9 Jan 2023

2022

Accelerating zk-SNARKs - MSM and NTT algorithms on FPGAs with Hardcamloriginal ↗
7 Dec 2022
Visualizing information propagation in marketsoriginal ↗
23 Nov 2022
Computations that differentiate, debug, and document themselvesoriginal ↗
17 Nov 2022
Introducing the Jane Street Graduate Research Fellowshiporiginal ↗
30 Aug 2022
What the interns have wrought, 2022 editionoriginal ↗
25 Aug 2022
Research internships in our Tools and Compilers grouporiginal ↗
4 Mar 2022
How Jane Street Pairs Interns to Projects and Teams During the Software Engineering Internshiporiginal ↗
14 Jan 2022
Magic-trace: Diagnosing tricky performance issues easily with Intel Processor Traceoriginal ↗
11 Jan 2022

2021

Hiring a Developer Educatororiginal ↗
21 Oct 2021
Goodbye Core_kerneloriginal ↗
26 Aug 2021
What the interns have wrought, 2021 editionoriginal ↗
9 Aug 2021
Looking for a developer experience engineeroriginal ↗
15 Jun 2021

2020

Growing the Hardcaml toolsetoriginal ↗
1 Dec 2020
Announcing Our Market Prediction Kaggle Competitionoriginal ↗
24 Nov 2020
Finding memory leaks with Memtraceoriginal ↗
6 Oct 2020
Memory allocator showdownoriginal ↗
15 Sept 2020
Announcing Signals and Threads, a new podcast from Jane Streetoriginal ↗
31 Aug 2020
What the interns have wrought, 2020 editionoriginal ↗
17 Aug 2020
The Jane Street Interview Process — 2020 Editionoriginal ↗
24 Jul 2020
Really low latency multipliers and cryptographic puzzlesoriginal ↗
22 Jun 2020
Using ASCII waveforms to test hardware designsoriginal ↗
1 Jun 2020
Chrome extensions: Finding the missing prooforiginal ↗
17 Apr 2020
Watch all of Jane Street's tech talksoriginal ↗
20 Feb 2020
Troubleshooting systemd with SystemTaporiginal ↗
3 Feb 2020

2019

Using Python and OCaml in the same Jupyter notebookoriginal ↗
16 Dec 2019
Deep-Learning the Hardest Go Problem in the Worldoriginal ↗
6 Dec 2019
Commas in big numbers everywhere: An OpenType adventureoriginal ↗
14 Oct 2019
What the interns have wrought, 2019 editionoriginal ↗
30 Aug 2019
Using OCaml to drive a Raspberry Pi robot caroriginal ↗
19 Aug 2019
Do applied programming languages research at Jane Street!original ↗
16 Aug 2019
A look at OCaml 4.08original ↗
12 Jul 2019
Of Pythons and Camelsoriginal ↗
9 Jul 2019
Thoughts from AAAI 2019original ↗
13 May 2019
Learning ML Depth-Firstoriginal ↗
17 Apr 2019
Machining the ultimate hackathon prizeoriginal ↗
28 Feb 2019
Accelerating Self-Play Learning in Gooriginal ↗
28 Feb 2019
Playing Atari Games with OCaml and Deep Reinforcement Learningoriginal ↗
2 Feb 2019
L2 Regularization and Batch Normoriginal ↗
29 Jan 2019
A tutorial for building web applications with Incr_domoriginal ↗
15 Jan 2019

2018

How to shuffle a big datasetoriginal ↗
26 Sept 2018
Deep learning experiments in OCamloriginal ↗
20 Sept 2018
What the interns have wrought, 2018 editionoriginal ↗
6 Aug 2018
Plans for OCaml 4.08original ↗
29 Jun 2018
Repeatable exploratory programmingoriginal ↗
22 Apr 2018
OCaml all the way downoriginal ↗
4 Apr 2018
Putting the I back in IDE: Towards a Github Exploreroriginal ↗
27 Mar 2018
Learn OCaml in NYCoriginal ↗
16 Feb 2018
Proofs (and Refutations) using Z3original ↗
15 Feb 2018

2017

Work on the OCaml compiler at Jane Street!original ↗
20 Dec 2017
Does batch size matter?original ↗
31 Oct 2017
How Jane Street Does Code Review (Jane Street Tech Talk)original ↗
29 Oct 2017
Jane Street Tech Talk, Verifying Network Data Planesoriginal ↗
26 Sept 2017
Real world machine learning (part 1)original ↗
28 Aug 2017
How to design a tree diffing algorithmoriginal ↗
25 Aug 2017
Ironing out your development styleoriginal ↗
24 Aug 2017
Hiring an FPGA engineeroriginal ↗
16 Aug 2017
What the interns have wrought, 2017 editionoriginal ↗
14 Aug 2017
When Bash Scripts Biteoriginal ↗
11 May 2017
Looking for a technical writeroriginal ↗
1 May 2017
Caveat Configurator: how to replace configs with code, and why you might not want tooriginal ↗
25 Apr 2017
This is not the performance you were looking for: the tricks systems play on usoriginal ↗
20 Apr 2017
Trivial meta-programming with cinapsoriginal ↗
20 Mar 2017
One more talk, two more videosoriginal ↗
15 Mar 2017
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