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We’re once again at the end of our internship season, and it’s my taskto provide a few highlights of what the dev interns accomplished whilethey were here.

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.

Jane Street is excited to announce our sponsorship ofSoME3, Grant Sanderson and James Schloss’sthird Summer of Math Exposition. SoME is a contest that Grant ...

In part one, we discussed how OCaml’slocality mode enables safe stack allocation. In this post, we willexplore additional modes for representing ownership.

Coming from OCaml, the Rust programming language has many appealingfeatures. Rust’s system for tracking lifetime and ownership allowsusers to safely express...

Our traders and researchers love Python for its agility and for its hugeopen-source ecosystem, especially when it comes to machine learning. Butthe heavy use...

At Jane Street we use a pattern/library called “expect tests” thatmakes test-writing feel like a REPL session, or like exploratoryprogramming in a Jupyter no...

In 2022 a consortium of companies ran an international competition,called the ZPrize, to advance the state ofthe art in “zero-knowledge” cryptography. We dec...

The Dojima rice market, established around 1716, is widely considered tobe the world’s first organized futures exchange. Instead of directlyexchanging money ...

One of the problems we wrestle with at Jane Street is how tounderstand and manage the costs associated with the positions we hold:things like margin, financi...