Manuel Barkhau
Freier Software Entwickler at Freelance
Hesse, Germany
Summary
🤩
Rockstar🎓
Top SchoolManuel Barkhau is a seasoned Python backend developer and freelance software engineer with 14 years of experience building production systems and leading development teams. After a decade as Lead Software Developer at admetrics GmbH he now focuses on freelance projects and open-source work, contributing meaningful enhancements to libraries like WeasyPrint and firmware projects such as QMK. His contributions span backend PDF rendering improvements (advanced CSS image layout and scaling) to embedded keyboard firmware keymaps and build artifacts, showing comfort across high-level services and low-level C. Based in Hesse, Germany, he pairs practical engineering with a long-standing commitment to open source, authoring libraries and shipping tangible improvements that bridge developer tooling and device-level code.
14 years of coding experience
14 years of employment as a software developer
Technischen Universität Darmstadt
Stackoverflow
8,329reputation
1.4mreached
26answers
7questions
benchmarking
top-1%
mariadb
top-1%
security
top-5%
string-concatenation
top-5%
go
top-5%
xml
top-5%
Github Skills (39)
keyboard-input10
atmel10
python10
mysql10
mariadb10
qmk-firmware10
firmware10
css10
pdf10
benchmarking10
qmk10
c1110
insert10
keyboard10
c1710
Programming languages (19)
Github contributions (5)
Kozea/WeasyPrint
Nov 2012 - Jun 2019
The awesome document factory
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 commits, 2 PRs, 20 comments in 6 years 7 months
Contributions summary:Manuel primarily contributed to enhancing the WeasyPrint PDF generation library. Their work involved modifying existing code to add and refine features related to page sizing and scaling. They refactored code to introduce percentage calculations for image and gradient positioning and added object-fit and object-position CSS properties for image layout. These changes likely improved the control and flexibility of the document rendering process.
pythonpdffactorycsshead
qmk/qmk_firmware
Mar 2016 - Apr 2016
Open-source keyboard firmware for Atmel AVR and Arm USB families
Role in this project:Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:7 commits, 2 PRs, 5 comments in 7 days
Contributions summary:Manuel primarily contributed to the implementation of a keyboard layout and related functionality within the QMK firmware. This involved modifying keymap files in C, adding new key mappings for a custom keyboard layout and integrating them into the existing firmware codebase. Further contributions included generating and adding a hex file, demonstrating a grasp of the build and deployment process for the keyboard firmware.
rp2040firmwareavratmelkeyboard-support
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