University

National Research Institute in Computer Science and Automation (INRIA, team Cassis) and Department of Computer Science for Complex System (DISC, team Vesontio), respectively at Besançon and Nancy, France:

• 2014 Computer Science PhD thesis, theme: Automatic Generation of Unit Test with Praspel, a Specification Language for PHP.

University of Sciences and Techniques at Besançon, France:

• 2011 Computer Science Master thesis: Realistic Domains for the Generation of Unit Tests Driven by Contracts,
• 2011 Computer Science Research Master's degree, with honors,
• 2009 Computer Science Bachelor's degree, with honors.

Secondary

High school Jules Viette at Montbéliard, France:

• 2006 High school diploma, Life and Earth Sciences speciality.

Self-taught

since 2003 Training in various Computer Science domains.

• Feb. 2018 Contract-based testing for PHP with Praspel, published in the Journal of Systems and Software, pages 209-222,
• Jul. 2014 My PhD thesis, Automatic generation of unit tests with Praspel, a specification language for PHP, thesis (in French),
• Mar. 2013 A Constraint Solver for PHP Arrays, presented at Constraints in Software Testing Verification and Analysis (CSTVA, Luxembourg, Luxembourg), article,
• Apr. 2012 Grammar-Based Testing using Realistic Domains in PHP, presented at Advances in Model Based Testing (A-MOST, Montréal, Canada), article,
• Nov. 2011 Praspel: A Specification Language for Contract-Driven Testing in PHP, presented at International Conference on Testing Software and Systems (ICTSS, Paris, France), article.

since 2022 Senior Engineer at Element

Be in your element. A sovereign and secure communications platform. Built by the creators of Matrix.

I'm currently part of the Matrix Rust SDK team. My goal is to develop, improve and maintain this Matrix SDK, written in Rust, that is the foundation of many important projects in the Matrix community. It is notably used by Element X, the next-generation cross-platform Matrix client.

The Matrix Rust SDK:

• Work on improving, developing and maintaining the most popular open-source Matrix SDK to create Matrix clients and bots,
• It is the foundation for Matrix clients like Element X or Fractal. It also provides many bindings to Swift, Kotlin, Go and so on,
• Have participated in the design and development of Sliding Sync, a novel, fast and light sync mechanism for Matrix.

Bindings for the Matrix Rust SDK:

• Bindings to Swift and Kotlin exist via UniFFI,
• I've implemented the support for async/Future in UniFFI, allowing Rust async code to be called and driven by foreign languages, like Swift, Kotlin or Python. This work had an important impact on the Matrix Rust SDK and clients like Element X.
• Other bindings have been manually implemented, like:
  • matrix-sdk-crypto-wasm, which are bindings to matrix-sdk-crypto (from the Matrix Rust SDK) for WebAssembly within a JavaScript host. It is used by Element Web, Thunderbird, and other Matrix clients,
  • matrix-sdk-crypto-nodejs, which are bindings to matrix-sdk-crypto (from the Matrix Rust SDK) for NodeJS.

Other contributions:

• eyeball, a library to make reactive programming in Rust,
• (to be release soon), a library to run WebAssembly with Component Model and WIT on all platforms

See all my open-source contributions. See my series about reactive programming in Rust.

2019-2021 Late Co-Founder & Compiler Engineer at Wasmer

The most popular open-source WebAssembly runtime

I've joined Wasmer few weeks after the creation of the company. At the time of my departure, Wasmer became one of the most popular WebAssembly runtime in the world, with 17'000 stars on the Github organisation, with users like Confio, Fluence Labs, HOT-G, Brave, Google, Apple, SpaceMesh, Linkerd, SingleStore, Clever Cloud, Kong to name a few.

My engineering job mostly happened on the Wasmer runtime itself, which includes the API, the C API, the compilers, the ABI (mostly WASI), the engines, the middlewares, and the VM. At that time, I was the #2 contributor on this codebase. I also have participated to set up a “learning environment” with a polished collection of examples, a polished documentation etc. In addition to the runtime, I have created all the official embeddings, i.e. extensions to use Wasmer inside other technologies.

In early 2021, I became late co-founder, then doing all the corresponding tasks like accountabilities, hiring interviews, management meetings, operation meetings etc.

Wasmer runtime:

• Work on improving and developing the most popular open-source WebAssembly runtime, every part of it,
• The runtime is mainly composed of:
  • 3 compilers: Singlepass, Cranelift, and LLVM,
  • 3 engines: JIT, shared object file, static object file,
  • the VM core,
  • a high-level public API,
  • a C and C++ API.

Wasmer embeddings:

• I've embedded Wasmer in various popular languages through native extensions, packages etc. Almost all of the following projects have reached the status of “the most popular project” to run WebAssembly for each language,

Wasmer in more exotic places:

• Develop a unikernel to run WebAssembly with Wasmer,
• Experiment with a real-time OS to run WebAssembly modules on microcontrollers.

See all my open-source contributions. Learn more by reading my article about my departure of Wasmer.

2017-2019 Code Wrangler at Automattic

We are passionate about making the web a better place

I have joined the Payment team:

• Develop, test, and maintain the payment, subscription, renewal, and billing engine for all Automattic' services (WordPress.com, Akismet, VaultPress, Crowdsignal etc.),
• Develop a custom Apple Pay implementation from scratch for WordPress.com, today running in production,
• Set up documentation-testing for many code bases,
• Develop and maintain several internal tools.

Gutenberg, the new WordPress editor :

• Create a parser for Gutenberg, the new WordPress editor, in Rust and compile it to many targets (WebAssembly, NodeJS, PHP extension, C). Learn more by reading my blog series about it.

See all my open-source contributions.

2015-2017 Engineer at Liip

We consult, design, develop, follow-up

Work mostly for one customer, Piaget.com, a multi-national e-commerce application:

• 16 domains, 10 languages, 2 data centers,
• Implement multi-lingual search with Solr,
• Implement new payment service providers world-wide,
• Test the accessibility and the conformity against the standards.

Create The Accessibility Machine:

• An automated accessibility testing tool which crawls and tests pages of any Web application to produce detailed reports,
• Combines different technologies together.

See all my open-source contributions.

2014-2015 Engineer at fruux

Sync contacts, calendars & tasks, powers millions of users world-wide

Work mainly on Sabre, the open source CardDAV, CalDAV and WebDAV server:

• sabre.io, maintain and develop new features in all sabre/dav libraries (implementing new standards, better tests etc.),
• New product: sabre/katana, a CalDAV, CardDAV and WebDAV ready-to-use server,
• fruux.com, help to maintain and develop new features on the WebApp,
• Contribute to RFC by providing test suites and reporting errors,
• Work with an international team (3 countries, 2 timezones, everything in English, regular meetings once a week…).

See all my open-source contributions.

2009 Intern at Mozilla Foundation

Building a better Internet, promote openness, innovation & opportunity

Worked under the authority of Paul Rouget, during 6 months:

• Implementation of HTML5 in Gecko,
• Experimental project about the “find” feature of Firefox in Mozilla Labs,
• Worked with an international team (documentation, video, help…),
• Promotion of Mozilla in different events.

Since this internship: Many bug reports, hacks and little projects during my spare time.

2007-2021 Hoa

A modular, extensible and structured set of PHP libraries; aims at being a bridge between industrial and research worlds

Creator and lead developer of the Hoa project:

• Initial idea: Learn, hack and contribute to a lot of different domains,
• Community of 20 permanent contributors,
• Large community of more than 2200 persons,
• Important users, whose Mozilla, fruux, ownCloud,
• International non-profit foundation,
• Several events (including community ones) in different countries,
• An actual bridge between the industrial and research worlds,
• Reached 275 millions installations in Febuary 2026.

The project has been archived in 2021.

See all my open-source contributions.