Native Development

C/C++ (♥), Python, Rust, Java or Kotlin - let’s go! My favourite rendering APIs? Vulkan, OpenGL (with GLSL). Librarys? Vulkan SDK, libcurl, GLUT, SDL2 and Dear ImGui. And did you know that I’m the maintainer of Open-Smartwatch?

Web Development

PHP, HTML, CSS, JS and TS - you name it! Libraries and Frameworks? Python Flask or FastAPI (♥) (with Poetry), Angular, Cordova and Electron. Things I know? Well, NodeJS/NPM and NVM.

Development operations

DevOps? Of course! Gitlab CI, GitHub Actions, Docker and Kubernetes: Starting with just some code-format-checks up to tested, scaled, auto-deployed and prodution-ready apps - even this site is part of a CI pipeline!

Systems administration

Linux is my world! I also enjoy working with a lot of other server-related software: Virtualisation (KVM, Docker, Kubernetes), storage (ZFS, NFS), services (Nextcloud, Jellyfin, BookStack and many more) or management (Netdata, Ansible) are only some of my loved tools!

Software engineering

I love to design systems: Starting by just the internal class diagrams of a server instance up to the whole API backend with distributed MicroServices.

Webdesign

You need a website or want to modify an existing one? Wordpress, Joomla and now Hugo - I worked with all of them.

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From my blog

Random encounters with fascinating software and sporadic posts about the world (of tech). Some DIY projects included - refer to their package leaflet for risks and side effects.

Repair reMarkable Cloud & Updates

on July 11, 2026 10:53

What is going on?

Hi! Something lovely today.

Starting this year I picked up my reMarkable 2 e-ink tablet again and wanted to use it. I already observed before, if the device was turned of for “a while”, it would need two attempts to start: First would get stuck in the bootscreen, the second then load to the normal PIN-entry. It did bother me a little, but as the software was working otherwise fine… I did not address it.

Mellanox QSFP/SFP28 PCIe Brackets

on January 9, 2026 12:19

Just a very quick post, as I invested some time into a proper, parameterized FreeCAD model for the PCIe brackets of Mellanox network cards. I recently installed two of these cards into some server and only had the short brackets available, which are, of course, not fitting into a standard PC case. As I could not find any ready-to-print models online for all the variations I needed, I have created my own. You can download this model from here or from Thingiverse.

Ceiling Light: B.K. Licht and Home Assistant - 2025 Upgrade

on November 23, 2025 12:47

Huh? What?

…so, this post is a follow-up to the original Ceiling Light: B.K. Licht and Home Assistant blog post from 2023.

So, over the years of use, I noticed a minor issue with the original wiring: Whenever the light is turned off, the transistors controlling the individual color channels are unable to fully turn off the outputs. This leads to a small current flowing through the LEDs, which in turn causes them to glow faintly red, even when turned off.