Holger Friedrich
Systems Engineer at Frankfurt Institute for Advanced Studies
Germany
Summary
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RockstarHolger Friedrich is a systems engineer with 12 years of hands-on experience specializing in smart home, robotics, and embedded Linux platforms from Germany. He combines DevOps and backend skills to design and maintain reliable build and deployment pipelines, notably contributing to the widely used openHABian project to support Raspberry Pi and Pine64 images. Holger also modernizes legacy C++ and Java integrations—refactoring background-subtraction code to current OpenCV versions and improving KNX bindings for secure, time- and color-aware home automation. His work shows a practical focus on portability, dependency hygiene, and runtime stability, including fixes for memory leaks and compiler warnings uncovered by static analysis. Curious and pragmatic, he bridges hardware-specific image tooling with higher-level automation protocols, making him effective at turning tinkering into production-grade systems.
12 years of coding experience
Github Skills (26)
opencv10
c-language10
scripting10
debian10
image10
bash10
java10
javas10
script10
build-automation10
system-administration10
sh10
computer-vision10
shell10
raspberry-pi10
Programming languages (12)
Github contributions (5)
openhab/openhab-addons
Dec 2020 - Jan 2023
Add-ons for openHAB
Role in this project:
Back-end Developer
Back-end DeveloperContributions:227 reviews, 29 commits, 183 PRs in 2 years 1 month
Contributions summary:Holger primarily focused on enhancing the KNX binding, a Java-based integration for home automation systems. Their contributions involved upgrading external libraries, specifically the Calimero library, which is central to KNX communication. The user also added new features and improved the handling of color temperature and time-related data types, as well as made improvements to the code structure and security by adding Java annotations. Further contributions were made to improve the handling of serial gateways, and the incorporation of new features for IP secure connections.
add-onsopenhabaddonjavaons
openhab/openhabian
Jun 2019 - Mar 2021
openHABian - empowering the smart home, for Raspberry Pi and Debian systems
Role in this project:DevOps & System Engineer
DevOps & System EngineerContributions:8 reviews, 47 commits, 75 PRs in 1 year 8 months
Contributions summary:Holger primarily contributed to the build process and infrastructure management of the openHABian project. They modified build scripts to accommodate different hardware platforms (Raspberry Pi and Pine64), including image mounting and resizing. The user also updated package installation routines, corrected dependencies, and enhanced the image compression process. The user also focused on system service management and configuration.
raspberry-piopenhabraspbianraspberryhome-automation
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