Björn Büttner
Software Engineer at Björn Büttner
Mülheim an der Ruhr, North Rhine-Westphalia, Germany
Summary
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SeniorBjörn Büttner is a pragmatic software engineer from Mülheim an der Ruhr with over a decade of hands-on experience building and optimizing APIs, backend services, and CI pipelines. He combines deep PHP expertise with practical operations skills—webserver management, performance monitoring, and database optimization—making him effective across the full delivery lifecycle. Björn has contributed to well-known open-source tooling like PHPUnit, improving test coverage and reliability, and has driven parser and library improvements that preserve behavior and traceability. Comfortable supporting front-end teams and developer workflows, he also automates QA and builds resilient microservices without needing to design UI. Colleagues rely on him for performance-first solutions and thoughtful test automation that keep systems robust in production.
10 years of coding experience
8 years of employment as a software developer
German, English, French
Stackoverflow
80reputation
2kreached
17answers
1question
Github Skills (22)
unit-testing10
parserator10
parser10
test-driven-design10
mstest10
testing10
css10
teste10
phpunit10
php10
ui-testing10
test-automation10
package9
packager9
composer9
Programming languages (19)
Github contributions (5)
sebastianbergmann/phpunit
Jul 2018 - Jul 2018
The PHP Unit Testing framework.
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:13 commits, 4 PRs, 13 comments in 4 days
Contributions summary:Björn primarily focused on improving the testing coverage and quality of the PHPUnit framework. They added new tests for previously untested methods, addressing code style issues and refining existing tests. The contributions included implementing test cases to validate functionalities, particularly focusing on the TestResult and TestSuite components. These changes indicate a dedication to ensuring the robustness and reliability of the testing framework.
phpunit-testing-frameworkphpunittesting-tools
MyIntervals/PHP-CSS-Parser
Nov 2020 - Nov 2020
A Parser for CSS Files written in PHP. Allows extraction of CSS files into a data structure, manipulation of said structure and output as (optimized) CSS
Role in this project:Back-end Developer
Back-end DeveloperContributions:5 commits, 1 PR, 5 comments in 1 day
Contributions summary:Björn primarily focused on improving the functionality and structure of the CSS parsing library. Their commits include fixing issues related to the expansion of shorthands and ensuring the order of rules is preserved. They added features for accurate line number and column number tracking, and implemented and fixed unit tests to improve code reliability. Furthermore, they replaced spaces with tabs for code consistency.
cssdata-structureparserphpcomposer-package
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