Software architect and hands-on engineer in Brooklyn. I turn hard software problems into working systems, in distributed and real-time systems, identity and security. For most of my career I've created and maintained open-source software that other developers build on.
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| Railyard and Roundhouse | Created. Open-source plugins for Claude Code and Codex. Railyard delivers agent-written code through other models' review and verifies it where it runs; Roundhouse keeps the agents' machines set up. railyard.express |
| Humanizer | Maintainer. Dates, numbers and enums as readable text for .NET. I rebuilt its localization with AI coding agents, taking the upcoming Humanizer 4 from 49 to 87 languages in one package. |
| dotnet-artisan | Created. Skills that help coding agents write modern .NET, for Claude Code, Codex and GitHub Copilot CLI. |
| Lexicon | Created. A color vocabulary for code: eleven semantic categories across ten coordinated themes, starting with C# in Visual Studio. Site |
| Ooh Bubbles | Created. Real-time soap-bubble physics in the browser, with thin-film optics: a Rust and WebAssembly engine on WebGPU, in a TypeScript app. In active development, with the source private for now. |
| NuGet Package Explorer | Maintainer. Look inside any NuGet package, on the desktop or in the browser at nuget.info, linked from every package page on NuGet.org. About 10,000 monthly active users across web and desktop. |
| Zeroconf | Created. Bonjour and mDNS service discovery for .NET, with native iOS and Mac Catalyst targets. It ships inside Visual Studio. |
| Sign CLI | Created as SignService in 2016 to release Rx.NET and maintained it throughout, then turned it into Sign CLI on Microsoft's NuGet team as its top contributor. Code signing for Authenticode, NuGet, VSIX and ClickOnce. |
| MSBuild.Sdk.Extras | Created. More platforms from one SDK-style project. |
| Rx.NET | Former maintainer. Reactive Extensions for .NET. |
| Refit | Former maintainer. REST APIs as typed interfaces. |
| xUnit.net Visual Studio adapter | Former maintainer, as part of the xUnit.net core team. |
| Bouncy Castle (portable .NET version) | Former maintainer. The Bouncy Castle cryptography library as a portable .NET library. |
| Deterministic builds | A guide to reproducible .NET builds. |
| xUnit.net device runners | Created. Unit tests on phones and tablets, retired along with UWP and Xamarin. |
First-named inventor, U.S. Patent 12,111,957, Software Provenance Validation · Former Executive Director of the .NET Foundation · Microsoft MVP 2014–2020 and Regional Director 2018–2020