Émile Trotignon
Software Developer at Ahrefs
Villeurbanne, Auvergne-Rhône-Alpes, France
Summary
👤
Senior🎓
Top SchoolÉmile Trotignon is a software developer with nine years of experience, currently working at Ahrefs after contributing to OCaml-focused engineering at Tarides. An ENS Paris-Saclay alumnus and passionate functional programmer, he is an active open-source contributor—most notably improving ocamlformat’s configuration system and internals to boost maintainability. His background blends research-grade optimizations (Menhir and tail-call generalisation internships at Inria and OCamlPro) with practical full-stack and systems work from Node.js to C# and C++. Based in Villeurbanne, he combines deep type-driven OCaml expertise with a track record of measurable performance improvements (e.g., 4x fewer allocations and 10% speedups in parser code). He often focuses on internal tooling and refactors that enable bolder optimizations rather than flashy end-user features.
9 years of coding experience
3 years of employment as a software developer
Computer Science, Computer Science at École normale supérieure Paris-SaclayL1, MPSI, L1, MPSI at CPGE Jean PerrinL2, Mathematics and Computer Science, L2, Mathematics and Computer Science at Université Claude Bernard Lyon 1
English, German, French
Github Skills (5)
configuration-management10
refactoring10
refactor10
ocaml10
manipulation9
Programming languages (5)
Github contributions (5)
ocaml-ppx/ocamlformat
Sep 2022 - Jan 2023
Auto-formatter for OCaml code
Role in this project:
Back-end Developer
Back-end DeveloperContributions:47 reviews, 13 commits, 30 PRs in 4 months
Contributions summary:Émile primarily focused on refactoring and improving the configuration system of the OCamlFormat project. They made several changes to the configuration options, including replacing configuration `'a ref` by `unit -> 'a`, and removing access to irrelevant parts of the config. Furthermore, the user updated the project's dependencies and addressed issues related to record field normalization and the handling of prefix operators. These changes suggest an active role in improving the internal workings and maintainability of the code formatting tool.
metaocamlduneauto-formatteropam
EmileTrotignon/ocamlformat
Sep 2022 - Apr 2025
Auto-formatter for OCaml code
Contributions:2 PRs, 197 pushes, 42 branches in 2 years 6 months
formatterocamlauto-formatter
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