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Chloe Casale was planning to be an auto mechanic before taking an intro CS class on a bet. After a stint as a Forward Deployed Engineer at Palantir, Chloe came to Jane Street with no background in OCaml or finance. Now she leads a team of “desk devs” building tools for client-facing traders.
Fixing a stack overflow in js_of_ocaml cut local variables by 91% and compressed output by 16%, via variable coalescing and constant sinking.
neocaml 0.11 OSEC-2026-30: OCaml runtime "ephemeron data is freed while still referenced" OSEC-2026-28: github.com/ocaml/ocaml.org: Unauthenticated arbitrary file read via path traversal in ~/conferences/ocaml/**~ OCaml 4.14.5 released rocq-typescript-extraction (experimental): Extract Rocq definitions to TypeScript ES modules Bisect_ppx, the coverage tool, moving to ocaml-ppx Blog post: From…
Lots going in October, including: Attending SOOCon26 in BelfastMerging derivers in ppxlibUpdating Graft to Forester 6.0Building a playground for Michael's…
Just under 11 years ago, Christophe Troestler opened ocaml/ocaml#307 and the OCaml project’s association with AppVeyor began.
day10 builds Windows packages again and agrees with GitHub Actions on all but a handful of explainable cells; OCaml 5 has been killed by Ctrl-Break since 2022; opam 2.6 reached every CI; a page cache saved 0.64 seconds; and one CephFS metadata server was doing all the work.
Alcotest can now write JUnit reports with no change to your tests, enough to chart which tests are flaky and which broke, and tags put a flaky test aside. It also nests tests and runs under wasm, and dune-release gets Windows fixes.
Tessera wins the OpenUK software award, local AI agents pass the Red List exam, FoCS lecturing wraps up, OxCaml ox9 and an OpenWrt router rebellion, Eio sandbox fixes, a brief-powered Tangled spindle, a DuckDB index of UK labels, Tom Loosemore on personal agents, Taposaur, Rex, and a Madagascar field app.
What changed between OxCaml 5.2.0+minus39 and 5.4.0+ox9, covering unboxed values, atomic fields, safer effects, and experimental polymorphism over layouts and modes.
The following is part of a series of posts about 2026 summer intern projects—for more, see “What the interns have wrought, special jumbo 2026 edition”
