Fabrice Le Fessant

Paris, Ile-de-France

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Summary

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Rockstar

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Top School

Fabrice Le Fessant is a veteran software researcher and entrepreneur with 27 years of experience building reliable, large-scale systems and programming languages. He founded OCamlPro in 2011 and has served as CEO/CTO since 2018, helping major engineering teams (Jane Street, Facebook, Citrix) adopt OCaml, formal methods and Rust for industrial projects. A former INRIA researcher and MLDonkey creator, his work spans peer-to-peer and distributed systems, compiler and runtime contributions to the core OCaml distribution, and hands-on open-source development (notably on opam and ocaml.org). He also cofounded Origin Labs and led the Dune Network blockchain effort, blending language design, security and accessibility in a Tezos-derived ecosystem. Known for bridging deep academic expertise with pragmatic product delivery, he routinely ships both low-level compiler fixes and user-facing tooling.

27 years of coding experience

19 years of employment as a software developer

Doctor of Philosophy (Ph.D.), Computer Sciences, Doctor of Philosophy (Ph.D.), Computer Sciences at École Polytechnique

DEUG, Classe préparatoire, DEUG, Classe préparatoire at Lycée Chateaubriand, Rennes

Baccalauréat, Baccalauréat at Lycée Felix Le Dantec, Lannion

Stackoverflow

Stats

4,232reputation

239kreached

61answers

4questions

Badges

ocaml

top-5%

Github Skills (29)

debugging10

debug10

website-development10

system-programming10

compilation10

package-management10

compiler-development10

css10

c1110

ocaml10

standard-library10

c1710

bytecode10

compile10

html10

Programming languages (12)

TypeScriptShellC++ScilabCRustTypstOCaml

Github contributions (5)

ocaml/ocaml

Feb 1999 - May 2017

The core OCaml system: compilers, runtime system, base libraries

Role in this project:

Back-end Developer

Contributions:180 commits, 74 PRs, 25 pushes in 18 years 6 months

Contributions summary:Fabrice's commits primarily focused on modifying core OCaml system files, including the compiler, standard library, and associated tools. The contributions include bug fixes related to native code compilation and let-rec constructs, the addition of new primitives for Bigarray and other standard library functions, and enhancements to the bytecode compiler. The user also worked on improving the build process, including adding arguments to OCaml compiler and fixing warnings.

functional-languagecompilersruntime-systemapllwt

ocaml/v2.ocaml.org

Feb 2012 - Jul 2016

Implementation of the ocaml.org website.

Role in this project:

Full-stack Developer

Contributions:76 commits, 17 PRs, 13 pushes in 4 years 5 months

Contributions summary:Fabrice primarily contributed to the development of the OCaml.org website. Their work involved resolving merge conflicts and making updates to CSS styles, HTML pages, and the navigation bar. The user also added new pages, including a download page, and incorporated translations for a multi-lingual experience by adding a script. These changes indicate a focus on front-end and content updates for the website.

lwtocamlduneopam

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