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This talk breaks down a CTF puzzle Corwin de Zahr designed a few years back that involves finding problems and vulnerabilities within the OCaml runtime. Read the full transcript here: https://www.janestreet.com/tech-talks/hacking-ocaml/

There was a flurry of activity on ocaml-multicore/ocaml-uring this month leading to a release (ocaml/opam-repository#28604). ocaml-uring provides bindings to the Linux’s io_uring, which allows batching various syscalls to the kernel for it to execute out-of-order, and in parallel. Its principal use at the moment is for the high-performance Linux backend of Eio.

Continuing the previous theme of dabbling with matters agentic. Previously, I’d quite assiduously kept my fingers away from files. This time, I wanted to try something exploratory, switching to the agent for things I was actively stuck on.

A weekend sprint documenting the evolution from basic OCaml models to comprehensive validation infrastructure with field enhancements, time utilities, and cryptographic security improvements for the Chaufr MVP

Parsimoni has been selected for Techstars' autumn 2025 space accelerator programme!

Over the summer, Lucas Ma has been investigating ideas surrounding using effects in the OCaml compiler itself. He’s blogged some of his discoveries and adventures. The technical core of this work leads towards being able to use the OCaml compiler as a library on-demand to create a longer-lived “compiler service”. Of itself, that’s not at all revolutionary, but it is quite hard to do that with a 30 year old codebase that really was designed for single-shot separate compilation.

Building a comprehensive database testing suite for Chaufr: integration tests, transaction verification, migration rollback testing, connection pool stress tests, and performance benchmarks using Alcotest, Lwt, and Caqti