Dariusz Rumiński

Creator

West Pomeranian Voivodeship, Poland

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Summary

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Rockstar

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Top School

Dariusz Rumiński is a creator and seasoned software leader with 12 years of experience, currently directing engineering at Delivery Hero while maintaining PHP CS Fixer, a widely used open-source tool for enforcing PHP coding standards. He blends hands-on backend development with senior leadership, having progressed from engineer to Director of Software Engineering and led teams across large PHP ecosystems. An active contributor to major projects like Symfony, Zend Framework and PHPUnit, his niche is meticulous code quality—automating and applying CS fixes that improve readability, portability, and long-term maintainability. He holds an M.Eng. in Computer Science and brings a practical focus on test automation, internationalization, and cross-platform console robustness. Notably, his contributions often target subtle but high-impact fixes (license headers, phpdoc alignment, quoting consistency) that keep large frameworks healthy and easier to evolve.

12 years of coding experience

12 years of employment as a software developer

Master of Engineering (M.Eng.) Computer Science and Information Technology with major in IT Project Management, Master of Engineering (M.Eng.) Computer Science and Information Technology with major in IT Project Management at West Pomeranian University of Technology in Szczecin

Polish, English

Stackoverflow

Stats

544reputation

32kreached

15answers

0questions

Github Skills (80)

dependency-management10

reformatting10

url-routing10

testing10

windows10

enforcement10

phpunit10

security10

symfony-ux10

i18n-js10

coding-style10

php-cs-fixer10

cakephp10

react-components10

symfony-component10

Programming languages (22)

C#PowerShellMDXJavaCSSC++CTwig

Github contributions (5)

PHP-CS-Fixer/PHP-CS-Fixer

Jun 2014 - Jan 2023

A tool to automatically fix PHP Coding Standards issues

Role in this project:

Back-end Developer

Contributions:300 releases, 2342 reviews, 5188 commits in 8 years 8 months

Contributions summary:Dariusz primarily contributed to the codebase by modifying the PHP-CS-Fixer tool, focusing on various aspects. They implemented changes to handle new PHP syntax features, particularly related to generics, attributes, and union types. The user also added code to ensure more comprehensive testing and address identified bugs, indicating a focus on code quality and language feature compatibility.

code-stylefixphpstandardsstatic-code-analysis

php-coveralls/php-coveralls

Apr 2015 - Jan 2023

PHP client library for Coveralls API.

Role in this project:

Back-end Developer

Contributions:21 releases, 79 reviews, 92 commits in 7 years 10 months

Contributions summary:Dariusz primarily contributed to fixing code style issues and ensuring code quality within the PHP client library. Their work involved refactoring code, correcting formatting, and applying coding standards across various files. They focused on the `src` directory to change the PHP code.

api-clientapicoverallsphp-clientclient-library

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