Calixte Denizet
Firefox Engineer at Mozilla
Greater Saint-Brieuc Area France
Summary
🤩
Rockstar🎓
Top SchoolCalixte Denizet is a Firefox engineer with 15 years of software development experience, based in the Greater Saint-Brieuc area of France. He brings deep systems and compiler-level expertise—evident from contributions to Clang/LLVM debug and gcov instrumentation and performance work on Mozilla’s grcov—alongside practical full‑stack experience improving PDF.js UI and Firefox integrations. His background in numerical computing and JIT work at Scilab shows strong roots in mathematics and performance engineering, including LLVM-based JIT compilation and HDF5/XML integrations. An active open-source contributor, he has refined language tooling (tree-sitter Python), a Rust-based Python interpreter, and ML engineering utilities for Mozilla, combining careful refactoring, testing, and performance optimization. Colleagues benefit from his blend of rigorous academic training in mathematics and a pragmatic focus on maintainability and measurable improvements.
15 years of coding experience
4 years of employment as a software developer
One-year degree before postgraduate studies, Mathematics, One-year degree before postgraduate studies, Mathematics at Université de Rennes IMaster of Science (M.Sc.), Mathematics, With honors, Master of Science (M.Sc.), Mathematics, With honors at Université de Caen Basse Normandie
Stackoverflow
21reputation
338reached
2answers
0questions
Github Skills (44)
parserator10
debugging10
scanner10
javascript10
debug10
parser10
tree-sitter10
python10
llvm10
testing10
css10
pdfjs10
user-interface10
c1110
interpreter10
Programming languages (16)
Github contributions (5)
mozilla/grcov
May 2018 - Sep 2022
Rust tool to collect and aggregate code coverage data for multiple source files
Role in this project:
Back-end Developer
Back-end DeveloperContributions:59 reviews, 70 commits, 99 PRs in 4 years 4 months
Contributions summary:Calixte focused on improving the performance of the `grcov` tool by optimizing how it handles gcno and gcda files, which are essential for code coverage analysis. They refactored the code to reduce the use of temporary files and improve the efficiency of passing these buffer files into the LLVM parser. Additionally, the user added unit tests for llvm generated files and refactored code to address clippy warnings, improving the codebase's maintainability.
sarifcollectrustaggregatecoverage
mozilla/pdf.js
Jul 2020 - Jan 2023
PDF Reader in JavaScript
Role in this project:Front-end Developer
Front-end DeveloperContributions:1582 reviews, 761 commits, 1994 PRs in 2 years 6 months
Contributions summary:Calixte made several contributions to the PDF.js project focused on improving the appearance of the UI. They addressed visual inconsistencies in highlighted text, particularly when dealing with rotated elements. Furthermore, the user enhanced the user experience by working on the styling of the new "Alt text" dialog, improving the usability and aesthetics of the toolbar and page interaction. Their contributions also involved fixing issues related to text selection and display within the editor.
pdfjavascriptpdf-readerpdf-generationreader
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