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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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opam repo ci job timeouts

It’s Tuesday morning, and virtually all opam repo ci jobs are failing with timeouts. This comes at a critical time as these are the first jobs following the update of ocurrent/ocaml-version noted on 24th March.

04 Apr 2025

Marc Elvers

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Creating the SyntaxDocumentation Command - Part 2: OCaml LSP

In the first part of this series, Creating the SyntaxDocumentation Command - Part 1: Merlin, we explored how to create a new command in…

12 Jul 2024

Tarides

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How I explore domain problems cheaply and fast with OCaml: modeling a web router

You've heard of Domain-Driven Design, now buckle up for Type-Driven Domain..wait. Typed Domains Driving...nevermind. We're gonna use Only Types to Understand our Domain Problems Very Fast! 🚀

24 Aug 2023

Practical OCaml

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Extensible Records in OCaml Using dmap

We show how it is possible to use dmap to implement extensible records (that is, records which can be extended with new fields after they have been defined) in OCaml.

20 Jun 2023

Thomas Letan’s Blog

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How to Write a Simple Web Application Using Ocamlnet

This post might seem to be in apparent contradiction: Ocamlnet is a large, very opinionated framework for network programming that solves m...

25 Oct 2012

Matías Giovannini

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