Sebastian Heuer
Senior Staff Engineer at celebrate company
Hamburg, Germany
Summary
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RockstarSebastian Heuer is a Senior Staff Engineer and seasoned technology leader with 12+ years building and guiding web and backend systems from architecture to operations, most recently moving from CTO at die kartenmacherei to a senior engineering role at Celebrate Company. He favors simplicity, maintainability, and servant leadership, preferring to own product lifecycles and foster long-term relationships over short-term optimization. A pragmatic engineer and advocate for "boring code," he pairs hands-on contributions—like improving PHPUnit test coverage and enhancing SemVer-compliant version handling—with strategic leadership across startups and mid-size product teams. Based in Hamburg, he brings a mix of developer advocacy, QA/test automation, and backend expertise, plus real-world experience running engineering organizations. Outside work he pursues software craftsmanship and open source, and as a father he’s quietly focused on making code that’s robust enough to outlast him.
12 years of coding experience
15 years of employment as a software developer
German, English
Stackoverflow
1,032reputation
109kreached
3answers
7questions
Github Skills (19)
sem10
mstest10
testing10
teste10
phpunit10
testing-library10
php10
version-control10
ui-testing10
test-automation10
xdebug9
software-design8
dependency-injection6
factory-pattern6
amazon-web-services6
Programming languages (5)
Github contributions (5)
phar-io/version
Dec 2016 - Jul 2018
Library for handling version information and constraints
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 releases, 19 commits, 3 PRs in 1 year 7 months
Contributions summary:Sebastian primarily focused on enhancing the version handling library. Their contributions involved implementing features such as supporting logical OR constraints, ensuring SemVer compliance of version strings, and modifying the version comparison logic. They also refactored the codebase to improve maintainability and readability by removing build metadata and adding support for pre-release labels containing dots. These changes indicate a focus on improving the library's flexibility and adherence to versioning standards.
versioninghandlingversion-controlsemantic-versioning
sebastianbergmann/phpunit
Nov 2015 - Sep 2018
The PHP Unit Testing framework.
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:7 commits, 4 PRs, 14 comments in 2 years 9 months
Contributions summary:Sebastian primarily contributed to improving the PHPUnit testing framework. They implemented new tests, particularly for verifying the behavior of extensions with specific versions and requirements. They also refactored existing tests and added functionality to generate Xdebug filter scripts, enhancing the framework's code coverage capabilities. The user's work focused on improving test coverage, ensuring the framework's robustness, and streamlining the testing workflow.
testing-frameworktestingphpunit-testing-frameworkphp-unit
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