Mathieu Soysal — Rust software developer

Development has been my thing since the very start of my studies, and these days it is mostly Rust. What I care about is code that holds up over time — tests written first, boundaries that stay clean, and a pipeline that catches mistakes before I do.

I compete on CodinGame in Rust — top 1% of 320,000 — and I build the tooling I wish I had: CG Bundler, a Rust CLI published on crates.io with 2,300+ downloads, and reusable GitHub Actions for Java and Rust projects, now used by 600+ repositories.

Skills & practices

Practices

Test-driven development
Unit & integration testing
Mutation testing & fuzzing
SOLID principles
Clean Code

Continuous integration

GitHub Actions
SonarCloud
Codecov
Continuous benchmarking (Bencher)
Automated releases
Container builds with Jib

Languages & tools

Rust
Java
C (POSIX)
WebAssembly
Maven & Gradle
Docker
Git

Recent projects

CG Bundler — flattens a multi-file Rust project into a single optimized source file for CodinGame. AST-level rewriting, published on crates.io with 2,300+ downloads. Rust.
Javadoc Publisher — generates Javadoc from a Maven or Gradle project and deploys it straight to GitHub Pages, in one workflow step. Used by 600+ repositories. Java.
Jib Container Publish — builds a container image from a Java project with Jib and publishes it to GitHub Packages, with no Dockerfile. Java.
Site Vitrine — a showcase site built by hand in plain HTML and CSS, no frameworks. First-semester university coursework, from 2018.
Born2BeRoot Tracking — an interactive checklist for working through the Born2BeRoot system-administration project, and keeping track of what is done.
Replace String In File — a small cross-platform action that swaps a string inside a file. Runs the same on Ubuntu, Windows and macOS.

Experience & education

Open-source maintainer — GitHub, 2021 — present. Javadoc Publisher alone is used by 600+ repositories.
Common Core student — 42 Paris, 2023 — present. Systems programming in C and shell; currently building Taskmaster, a supervisord-style process-control daemon, in Rust.
DUT Informatique — IUT / Université de Montpellier, 2018 — 2022.