ContainerHive is a lean CLI tool that simplifies managing container base and library images at scale.

Instead of scattered Dockerfiles and manual build scripts, you define images declaratively in YAML – with dependency resolution, multi-platform builds, built-in testing, and SBOM generation powered by BuildKit.

It runs as a single static binary both locally and in CI/CD environments like GitLab CI or GitHub Actions – no external runtime dependencies required.

The project evolved from a proof of concept and is the production-grade successor to the Python-based poc-container-image-manager.

The mkdocs-kroki-plugin is a MkDocs plugin that enables the seamless integration of Kroki diagrams into mkdocs documentation.

Kroki supports a variety of diagram types (e.g. PlantUML, Mermaid, Graphviz, BlockDiag) and renders them dynamically as images directly in the MkDocs documentation.

With this plugin, you can embed diagram source code directly in Markdown and have it automatically converted into high-quality images during the build process.

I contacted the maintainer here in November 2025 and have been jointly responsible for the project ever since. Primarily responsible for further development and maintenance.

SchemaNest is a lightweight, team-friendly registry system for JSON schemas. It provides a central location for versioning, managing, and searching schemas—either via the accessible web interface or a CLI tool for integration into CI/CD pipelines.

Authentication, fine-grained API keys, and support for PostgreSQL and SQLite are built right in.

The frontend is based on Next.js, and the backend is written in Go, for max performance and easy maintenance.

mkdocs-decision-records is a plugin for MkDocs that simplifies the management of architecture and decision documents. It enables structured and transparent documentation of architectural decisions directly within MkDocs documentation.

The automatic recognition and integration of decision documents and customizable templates ensure consistent and comprehensible documentation. The plugin can be seamlessly integrated into existing MkDocs setups and supports development teams in efficiently documenting their decision-making process.

This way, mkdocs-decision-records helps to improve the developer experience and optimize documentation practices.

gitlab-ci-verify is a command line tool to verify and validate GitLab CI Yaml files to ensure they are valid and follow best practices.

It is written in Go and can be used standalone or with the pre-commit framework. Integration with shellcheck is done via embedding the static binary and calling it using a memory mapped executable.

The structure is built extendable and to be as easy to set up as possible.

UniLaunch, my first open source desktop application, was created in Avalonia and C#.

This cross-platform app offers customised autostart options based on time and other criteria.

All this out of the pain of always having to start programmes manually at certain times or depending on the situation. The goal here is to reduce the manual effort.

This is a toolkit to create interactive and shiny terminal UIs using plain bash builtins.

I built the tool to run anywhere the bash can run. The tested target platforms includes Git Bash for Windows, MacOS and Linux-based systems.

Thanks to the toolkit I can build cross plattform scripts with a shiny interface with ease. During the creation of this tool I learned a lot about bash internals that I never had to use before. It is a bit of a challenge to test due to slight differences on the target platforms but also gives quite an interesting challenge with an awesome reward.

This Docker image is specifically designed to provide a secure base for PHP applications. The goal is to provide a single image that contains both nginx and PHP FPM.

It is very pragmatic and offers a number of helpers for typical installation tasks like installing dependencies with Composer or setting up an index rewrite. These features simplify PHP application development and make developers' work easier.

The build is automated via GitHub Actions with each push to the repository.

There is already some tooling available to create reproducible artifacts in the serverless and terraform area. However, the situation with ZIP archives is rather poor.

Out of this need, a drop-in solution for zip was developed to create reproducible ZIP files.

The project is implemented as a GO CLI application. Individual functionalities can also be extended modularly with a plug-in system. This makes the tool very performant, easy to maintain and, thanks to Go, executable on all common platforms.

Another plugin for the Intellij platform was developed out of the need to be able to edit MJML with WebStorm and to cover also extended use cases. There are plugins for VS Code and Atom, but I don't really like to use either of them. Not really like to use one of the two tools.

Within a week, the plugin cracked the 1k download mark! I got a lot of positive feedback by mail and use it myself (almost) daily.

For this plugin, I could use my already gained experience from plugin development. To make the preview work, it was necessary to reach back into the Node.js bag of tricks.

This plugin was created out of the necessity to encrypt and decrypt Secrets always cumbersome via the Vault CLI.

To solve this problem, I have built a small plugin for IntelliJ. This plugin offers the context action to decrypt secrets in YAML files and copy them to the clipboard. This is a very fast and uncomplicated way to get hold of secrets.

The plugin also offers a context action for encrypting passwords in YAML so that you don't have to leave the IDE.

Since I sometimes use different configurations for the Vault password file or similar in different projects. And to keep all possibilities open for the user of the plugin, it can be configured on project level how Ansible-Vault is called.

In October 2025, I transferred the plugin to 4ch1m, who will now be responsible for its further development.

This useful tool is designed to help developers avoid having to manually comply with Semantic Versioning specifications when tagging with Git. It is a small but powerful application that saves a lot of time and effort in this regard.

It was programmed in Go, an efficient and powerful programming language.

The build process is done automatically via GitHub Actions on every push to the repository, which speeds up the development process and increases the quality of the code.

This is a pre-configured container for single-page applications to ensure smooth application operation. It is already contains everything needed to successfully deploy the application, including the required dependencies and configurations.

The project is very user-friendly and easy to use, as it is designed for quick and easy deployment of single-page applications. It helps developers focus on the actual development of their application instead of spending time configuring infrastructure and environments.

The image is built in an automated way using GitHub actions.

In close cooperation with Raphael Bittner, the new festive homepage for the 150th anniversary of the FFW Wildenau was created.

Here, a completely separate page was deliberately implemented as a single pager. The goal was an informative and clear page with a mobile-first approach.

The website was implemented as a single page application with Vue. It also supports operation as a progressive web app. This enables the use of the homepage or the download to the cell phone, thus making it possible for interested parties to use the site accordingly, offline and thus as a digital info sheet.

DrunkenRoyal is a fun drinking game for smartphone or tablet and of course for any party, except children's birthday parties. In which the players complete various challenges, they get to the finish line. But on the way there are some surprises waiting and of course a lot of alcohol.

The game was funded via Kickstarter by Christian Stockinger and released on Android and for iPhone and iPad.

The app was developed here by Christian Stockinger on a Unity basis.

My task in the context of the overall project was primarily the creation of the API for loading the challenges as well as the communication of the app with the backend and its offline functionality. I programmed this primarily in Kotlin, using GraphQL as the API, which turned out to be the most efficient for use with the app. Parts of the app had to be implemented in Java due to complications with Spring Boot. The API was deployed automatically with Jenkins.

Additionally, I took on the role of a tester for the Android app with continuous feedback in the development process to ensure an excellent user experience.

With this library, it becomes super easy for developers to respond to GitLab webhooks. This means that they will be notified immediately when certain events take place on GitLab, for example when someone creates a new project or when a code review is performed.

It also ensures that all data sent with the webhook is fully validated. This is necessary to ensure that only the data that actually comes from the GitLab server and has not been manipulated by a malicious attacker is processed.

All this makes it easier for developers to respond to GitLab webhooks and make their applications faster and more secure.

Simple CSV parser for parsing CSV files. The specification of columns to be mapped is done via annotations. These are read via reflection and cached per class. This achieves a performance almost like without reflection.

The parser supports the classic semicolon as a separator and any other separator. In addition to a classic API, a stream-based API is also included. The instances are created using the builder pattern.

In close cooperation with the responsible persons of the voluntary fire department Wildenau, I develop the website continuously and always add new requirements and adjustments to the homepage. The administrators of the FFW Wildenau have a compact administration interface at their disposal. This allows a completely customizable user experience.

Especially in relation to this, it is important that the responsible persons are already challenged with their voluntary work. Therefore, they should be able to easily and quickly enter new content such as contributions and deployments without a lot of bells and whistles. At the same time, the homepage represents the fire department's presence in the digital world.

I took over administration and maintenance, as well as hosting of homepage and mail server and help with technical questions. Additionally, I take care of the administration of the domain and the email accounts.

The design is relatively conservative and based on the wishes of the FFW Wildenau. No major changes have been incorporated here since 2021.

For KerzenWinni a one-pager with contact form, appointment calendar and guestbook was created in close consultation with the owner.

In addition, I take over hosting and maintenance of homepage and server. Special emphasis was put on a fast loading time for the homepage, here the content above the fold is loaded immediately, while only after scrolling visible elements of the page are integrated via separate asynchronous server requests. The gallery only loads the required images when they are requested. This enables fast loading times on mobile devices and saves data volume. This is particularly important because more than 89% of website calls are made via mobile devices.