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

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.

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.

.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)

• Certified IT specialist for application development (Fachinformatiker für Anwendungsentwicklung)
• Trainer aptitude certificate (AdA-Schein, AEVO), 2026
• Languages: German (native), English (fluent)

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