Michael Härtl - Senior Software Engineer at Michael Härtl

Michael Härtl

Senior Software Engineer at Michael Härtl

Weismain, Bavaria, Germany

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Summary

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Rockstar

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Top School

Michael Härtl is a Senior Software Engineer and seasoned freelance developer with over 25 years in IT and roughly 15 years of continuous professional experience delivering e-commerce and ERP architectures. He designs efficient, cost-conscious systems—from containerized online shops with Elasticsearch indexing, checkout and API integrations to robust ETL pipelines with transactional conversions and automatic error recovery. Comfortable across the stack, he pairs strong PHP and MySQL expertise with Linux/DevOps practices (Docker, CI/CD) and a disciplined test-driven approach. An active open-source maintainer and contributor, his work improves tooling and PHP libraries (including widely used Neovim and Yii projects), reflecting a long-standing commitment to clean OOP design and developer ergonomics. He’s known for an analytical, process-oriented mindset, coaching orientation, and a preference for small, focused teams that prototype early rather than overdesign.

15 years of coding experience

3 years of employment as a software developer

Dipl.-Ing. (FH), Elektrotechnik/Nachrichtentechnik, Dipl.-Ing. (FH), Elektrotechnik/Nachrichtentechnik at Ostbayerische Technische Hochschule Regensburg

English, tschechisch

Stackoverflow

Stats

8,498reputation

740kreached

198answers

28questions

Badges

php

top-5%

Github Skills (49)

yii10

application-framework10

debugging10

debug10

tree-sitter10

parser10

lib10

bootstrap10

testing10

css10

app-framework10

command-line-interface10

neovim10

php10

language-server10

Programming languages (28)

CSchemeGoHTMLTypeScriptShellAdblock Filter ListAstro

Github contributions (5)

mikehaertl/phpwkhtmltopdf

Apr 2012 - Mar 2021

A slim PHP wrapper around wkhtmltopdf with an easy to use and clean OOP interface

Role in this project:

Back-end Developer

Contributions:9 releases, 156 commits, 43 PRs in 9 years

Contributions summary:Michael's contributions primarily focused on enhancing the PHP wrapper `mikehaertl/phpwkhtmltopdf` by implementing new features. They added the functionality to render a PDF page from a string input. Furthermore, they addressed bugs related to escaping shell arguments, improving the regex used to detect HTML strings and improving the error reporting. The user also added features for windows users to prevent option misinterpretation.

wkhtmltopdfphpphp-wrapperslim-phpclean

mikehaertl/php-pdftk

Jul 2014 - Dec 2022

A PDF conversion and form utility based on pdftk

Role in this project:

Back-end Developer

Contributions:27 releases, 7 reviews, 128 commits in 8 years 6 months

Contributions summary:Michael primarily contributed to the development and enhancement of the `mikehaertl/php-pdftk` library, which is a PHP wrapper for the `pdftk` command-line utility. Their work involved implementing new operations like `unpackFiles()` and `attachFiles()`, along with improvements to existing functionalities like `fillForm()`. Furthermore, the user refactored code, updated tests, and addressed issues related to data handling and form filling within the library.

pdfpdf-conversionpdf-generationconversionpdftk

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