Markus Kalkbrenner
Head Of Software Engineering at JARLTECH
Frankfurt, Hesse, Germany
Summary
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Rockstar🎓
Top SchoolMarkus Kalkbrenner is a seasoned software engineering leader with 14+ years steering teams and technology strategy, currently serving as Head of Software Engineering at JARLTECH after a decade as CTO at bio.logis. He combines hands-on backend expertise—particularly in PHP and search technologies—with executive experience building reliable systems for enterprises and product-focused startups. An active open-source maintainer, Markus contributes to the widely used Solarium PHP Solr client and Drupal search modules, adding features, tests and PHP 8.1 compatibility for real-world search deployments. Based in Frankfurt, he brings a pragmatic engineering mindset informed by early roles at eBay and Cocomore, and a technical degree from FH Friedberg. Off the clock he channels his engineering precision into pinball culture, founding the Pinball Players Union Circuit, reflecting a knack for community-building beyond code.
14 years of coding experience
20 years of employment as a software developer
Dipl.-Ing. (FH) Computer and Information Sciences General, Dipl.-Ing. (FH) Computer and Information Sciences General at FH Friedberg
German
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (6)
php10
solr10
testing10
apidoc9
phpunit9
api9
Programming languages (13)
Github contributions (5)
solariumphp/solarium
Dec 2017 - Dec 2022
PHP Solr client library
Role in this project:
Back-end Developer
Back-end DeveloperContributions:57 releases, 36 reviews, 359 commits in 5 years
Contributions summary:Markus's contributions primarily focused on enhancing the Solarium PHP Solr client library. They made improvements to the library's Suggester and managed resource components by adding new features and options. The user also addressed code issues, such as fixing documentation and addressing PHP 8.1 deprecation errors, and contributed to testing by implementing integration tests for various Solr cloud features.
solrclient-libraryphpsolariumphp81
mkalkbrenner/HVClientLibPHP
Mar 2013 - Aug 2013
Contributions:43 commits, 1 comment in 5 months
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