Théo Fidry - Senior Software Engineer at Open Source

Théo Fidry

Senior Software Engineer at Open Source

Barcelona, Catalonia, Spain

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Summary

🤩

Rockstar

🎓

Top School

Théo Fidry is a Senior Software Engineer with 12 years of full‑stack web development experience, currently based in Barcelona and focused on backend PHP (Symfony, Laravel) and modern front-end stacks (React, TypeScript, SASS). He emphasizes readable, testable, and scalable code, and has a strong track record in improving build systems, testing infrastructure, and developer tooling across well-known open-source projects like Psalm and Infection. As an active maintainer and contributor, he’s driven performance and maintainability improvements (PHAR/build refactors, CPU core counting, deep-copy fixes) and also contributes to documentation and serializer robustness in Symfony. Comfortable leading technical initiatives, he has built CI pipelines, applied Hexagonal/CQRS architecture in startups, and automated dev environments with Vagrant/Ansible. Notably, his open-source work reveals a pragmatic focus on tooling and developer experience that often lives behind the scenes but materially improves project reliability and developer productivity.

11 years of coding experience

4 years of employment as a software developer

Summer school, Management, Marketing & Innovation, Summer school, Management, Marketing & Innovation at Dublin Business School

Engineer’s Degree, Information Technology, Engineer’s Degree, Information Technology at ECE Paris

High School, Scientific course with the Engineer Sciences option, High School, Scientific course with the Engineer Sciences option at Lycée Georges Brassens

MPSI, MP option Informatics, MPSI, MP option Informatics at Lycée Leconte de Lisle - CPGE

English, French

Stackoverflow

Stats

656reputation

81kreached

13answers

4questions

Github Skills (63)

unit-testing10

code-transformation10

api-platform10

react-components10

type-inference10

static-analysis10

testing10

terminal-emulator10

object-oriented-programming10

terminal-application10

makefile10

faker10

react-component10

security10

doc10

Programming languages (20)

C#JavaWeb Ontology LanguageCSSC++RustCMakefile

Github contributions (5)

nelmio/alice

Jul 2015 - Oct 2022

Expressive fixtures generator

Role in this project:

Back-end Developer

Contributions:59 releases, 18 reviews, 431 commits in 7 years 4 months

Contributions summary:Théo primarily focused on fixing and updating the Faker class, indicating a role in the backend logic or core functionality of the project. Their contributions included updating and fixing the Faker.php file and tests. Also, the user worked on fixes that were related to exceptions and the functionality of the container.

manage-fixturesfactoryfixturephpsymfony-bundle

infection/infection

Jan 2018 - Jan 2023

PHP Mutation Testing library

Role in this project:

Back-end Developer

Contributions:131 reviews, 301 commits, 679 PRs in 5 years 1 month

Contributions summary:Théo primarily contributed to the core functionality of the PHP mutation testing library, with a focus on the build process, documentation, and testing infrastructure. Their work involved improving the Makefile for better tooling integration, enhancing code quality with PHP-CS-Fixer, and establishing a testing framework. A significant portion of their work focused on incorporating and verifying the functionality and integrity of the tests suite as well as the integration of tools.

mutationmutation-analysismutation-testingphptest-framework

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