Oliver Hartl
Linux System Engineer at NetCologne
Germany
Summary
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Rockstar🎓
Top SchoolOliver Hartl is a Linux System Engineer with 14 years of experience building and operating reliable infrastructure across telco and energy sectors, currently at NetCologne. He brings a DevOps mindset from roles at Next Kraftwerke and as a freelancer, combining system administration, automation and software development to ship production-grade solutions. Oliver is an active open-source contributor to phpstan, where he improved static analysis of PHP functions like readdir and base64_decode—demonstrating attention to subtle language semantics that reduce runtime bugs. Based in Germany with a BSc in Informatics from Hochschule Niederrhein, he blends deep Linux expertise with hands-on back-end engineering and a pragmatic focus on correctness and observability.
14 years of coding experience
7 years of employment as a software developer
Bachelor of Science - BS Informatik, Bachelor of Science - BS Informatik at Hochschule Niederrhein
Stackoverflow
116reputation
47kreached
5answers
2questions
Github Skills (12)
php10
static-analysis10
phpstan10
testing10
htaccess6
doctrine-orm6
zend-framework6
configurations6
api6
bash6
keyboard6
escaping6
Programming languages (9)
Github contributions (5)
phpstan/phpstan
Aug 2018 - Mar 2019
PHP Static Analysis Tool - discover bugs in your code without running it!
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 commits, 3 PRs, 30 comments in 7 months
Contributions summary:Oliver contributed to the PHPStan project by addressing issues related to function signatures and return types. Their work includes correcting the return type of `readdir` and adjusting the behavior of `base64_decode` based on its parameters. They also added and modified the `Base64DecodeDynamicFunctionReturnTypeExtension` to handle `base64_decode` more accurately. These changes involved modifying the project's code, tests, and signature maps.
static-analyzerdiscoverlinterphp-static-analysistesting
ohartl/docker-deptrac
Jul 2018 - Dec 2021
Keep your php architecture clean. (via Docker)
Contributions:1 release, 2 reviews, 16 PRs in 3 years 5 months
docker-imagekeepdeptracphpdocker
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