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Using OxCaml to implement type-safe reference counting between OCaml and Python

Jane Street is known for being an OCaml shop, but for years now Python has been our second major programming language, acting as the primary tool for data an...

15 Jun 2026

Jane Street Tech Blog

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Label Maker in js_of_ocaml using Claude

I’ve taken a few days off, and while I’ve been travelling, I’ve been working on a personal project with Claude. I’ve used Claude Code for the first time, which is a much more powerful experience than using claude.ai as Claude can apply changes to the code and use your build tools directly to quickly iterate on a problem. In another first, I used js_of_ocaml, which has been awesome.

22 Aug 2025

Marc Elvers

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Feature Parity Series: Statmemprof Returns!

Statmemprof, a statistical memory profiler for OCaml, is now compatible with OCaml 5! Discover the technical background to the return of the feature.

06 Mar 2025

Tarides

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Inside OCaml objects

In the ocamljs project I wanted to implement the OCaml object system in a way that is interoperable with Javascript objects. Mainly I wante...

23 Mar 2010

Jake Donham

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