Guillaume Messier
IT Developer (PHP) at Ubisoft Montréal
Montreal, Quebec, Canada
Summary
👤
Senior🎓
Top SchoolGuillaume Messier is an experienced PHP developer based in Montreal with eight years of professional engineering experience and a background that bridges web development, technical leadership, and animation. Currently an IT Developer at Ubisoft Montréal, he previously led a development team as CTO at O2 Web, establishing processes and acting as technical contact for key clients. He contributes to notable open-source tooling—helping improve Psalm, a widely used PHP static analysis tool—focusing on type inference and assertion finding to catch subtle bugs. Known for strong analytical skills, rigor, and a drive for continuous improvement, he quickly moves into greater responsibility and mentors teams. His early career in 2D animation and compositing supervision gives him a unique creative perspective on problem solving and system design.
8 years of coding experience
15 years of employment as a software developer
DEC, Dessin animé, DEC, Dessin animé at Cégep du Vieux MontréalAttestation, Programmation Internet, Attestation, Programmation Internet at Université de MontréalDEC, Arts visuels et mediatiques, DEC, Arts visuels et mediatiques at Cégep de Saint-Hyacinthe
French, English
Github Skills (10)
security-testing10
php10
type-inference10
static-analysis10
type-checking10
type-check10
security-scan10
security10
unit-testing8
configuration-management7
Programming languages (1)
Github contributions (5)
vimeo/psalm
Aug 2021 - Aug 2022
A static analysis tool for finding errors in PHP applications
Role in this project:
Back-end Developer
Back-end DeveloperContributions:17 commits, 4 PRs, 7 comments in 1 year
Contributions summary:Guillaume primarily contributed to the `psalm` project, a PHP static analysis tool. Their commits reflect changes related to assertion finding, specifically focusing on identifying and inferring types within conditional statements. The user also modified code related to arithmetic operations and type comparisons. Additionally, the user made updates to the configuration and error handling, as well as unit tests.
security-analysisfindingphptaint-analysisphp-applications
gmessier/psalm
Aug 2021 - Sep 2023
A static analysis tool for finding errors in PHP applications
Contributions:19 pushes, 4 branches in 2 years 1 month
findingphpstatic-analysisphp-applications
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.