Fabien Potencier
Chief Product And Technology Officer at Upsun (formerly Platform.sh)
Paris, Ile-de-France
Summary
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Rockstar🎓
Top School
Top expert inSymfony Development EssentialsPHP Development and E-commerce Web Technologies
Fabien Potencier is a veteran software leader and entrepreneur with 17+ years driving major open-source ecosystems and product strategy from Paris. As Founder and long-time project lead of Symfony and current Chief Product & Technology Officer at Upsun (formerly Platform.sh), he blends deep backend engineering with executive product leadership. He’s a prolific contributor to core PHP tooling—ranging from Symfony components like HttpClient, Cache and Console to widely used projects like Composer, Twig and PHPUnit—demonstrating expertise in security, performance and developer experience. Fabien has founded and led multiple companies (Sensio, Blackfire) and often moves between hands-on coding (mime, var-dumper, dotenv) and shaping platform-level product decisions. Notably, he pairs language-level work (parsers, polyfills, YAML) with practical operational improvements such as CLI tooling and CI integration. He holds advanced entrepreneurial training from HEC Paris and an engineering background from Mines Nancy, combining business acumen with low-level technical craftsmanship.
17 years of coding experience
26 years of employment as a software developer
Ecole Nationale Supérieure des Mines de NancyMastère Entrepreneurs, Mastère Entrepreneurs at HEC Paris
Stackoverflow
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Github Skills (181)
dependency-management10
url-routing10
parser10
package-management10
annotations10
abstract-syntax-tree10
testing10
command-line-interface10
contract10
http10
authentication10
test-framework10
smtps10
httpc10
message-queue10
Programming languages (15)
Github contributions (5)
symfony-cli/symfony-cli
Dec 2021 - Jan 2023
The Symfony CLI tool
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:15 releases, 59 reviews, 212 commits in 1 year
Contributions summary:Fabien primarily contributed to the Symfony CLI tool by enhancing its functionality and improving its user experience. They implemented updates to the updater, added more informative upgrade instructions, and fixed issues related to the tunnel support. The user also made improvements to the project's infrastructure by bumping dependencies, reorganizing files, and ensuring a clean shutdown of the server. They also addressed and fixed Platform.sh-specific components.
symfony-clibundlephpsymfony-bundlecli-tool
symfony/security-http
Sep 2013 - Jan 2023
Symfony Security Component - HTTP Integration
Role in this project:Back-end Developer
Back-end DeveloperContributions:219 releases, 528 commits, 1 PR in 9 years 5 months
Contributions summary:Fabien primarily worked on refactoring and improving the remember-me functionality within the Symfony Security Component - HTTP Integration repository. Their commits focused on implementing enhanced security measures, like token validation and session migration, to mitigate session fixation and strengthen cookie security. These changes involved modifying core classes and components related to authentication and session management, ensuring a more robust login system within the context of the Symfony framework. The user also updated the code to avoid generating remember me tokens when the token is still valid.
spring-frameworkauthorizationjava-springsecurityauthentication
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