Software engineer from Germany working in C#/.NET and Rust. I build CI/CD pipelines and release automation, desktop applications, and software that talks to hardware.
My day job is software for the digitalization of emergency medical services: build and release pipelines, Windows desktop clients, smart card readers and mobile broadband connectivity. In my own time I work on open-source tools around SSH, smart cards and software licensing.
- CI/CD: GitLab CI on Windows runners with the PowerShell executor, Jenkins, GitHub Actions with composite actions and reusable workflows
- Release automation and packaging: NuGet with pre-release versioning and Central Package Management; tag-driven GitHub releases built from the binaries of the CI run that passed; winget, AUR and NSIS installers
- Desktop applications: Avalonia, WPF and WinForms; reactive MVVM with ReactiveUI and DynamicData; moving legacy applications onto the .NET Generic Host
- Smart cards and secure channels: PC/SC, ISO 7816-4 APDUs and ATR parsing, PACE and Secure Messaging, German eGK
- Native interop: COM interop, Windows Mobile Broadband API (MBN), proprietary serial protocols with binary framing
OpenSSH-GUI · C# · Avalonia
Cross-platform desktop app for managing SSH keys, known_hosts and authorized_keys on Windows, Linux and macOS. Key generation, OpenSSH ⇄ PuTTY conversion, fingerprints without decrypting the private key, remote editing over SSH, and a recursive-descent ssh_config(5) parser exposed as an IConfiguration source. Released through GitHub Actions to GitHub, winget and the AUR.
KnowYourEgk · Rust · egui
Reads the insurance master data (VSD) from a German health insurance card (eGK G2.1), contact or contactless over NFC. Implements PACE (ECDH Generic Mapping, brainpoolP256r1) and AES Secure Messaging following the gematik specifications and ICAO Doc 9303-11, structured as a Rust workspace with a transport abstraction over PC/SC. No network code; the CAN and all session keys are zeroized after use. Releases are cut automatically from the version in Cargo.toml once CI on main is green.
OpenSourceInitiative.LicenseApi · C# · NuGet
.NET client for the Open Source Initiative License API: list, search and filter OSI Approved Licenses® by SPDX ID, name, keyword or steward, including the license text. Multi-targeted and published on NuGet.
- AnyBookStore · C# · ASP.NET Core + Angular: self-hosted personal book library; scan or enter an ISBN, rate it, mark it read, backed by the Open Library catalog
- license-me · Rust · CLI (archived): creates licenses for unlicensed projects on your machine; predecessor of LicenseMe (Avalonia)
| Languages | C#, Rust, PowerShell, Bash, SQL |
| CI/CD | GitLab CI, Jenkins, GitHub Actions |
| Packaging | NuGet, winget, AUR, NSIS |
| .NET | Avalonia, WPF, WinForms, ASP.NET Core, ReactiveUI, DynamicData, Microsoft.Extensions.* (Hosting, DI, Options), DryIoc, Dapper, EF Core, xUnit |
| Rust | egui / eframe, Cargo workspaces |
| Smart cards and security | PC/SC, ISO 7816-4, PACE, Secure Messaging, BouncyCastle, MIFARE Classic |
| Data and APIs | SQLite, REST, SOAP |
| Tools | JetBrains Rider, Jira, Confluence |
- Certified IT specialist for application development (Fachinformatiker für Anwendungsentwicklung)
- Trainer aptitude certificate (AdA-Schein, AEVO), 2026
- Languages: German (native), English (fluent)