John Wostenberg
Software Engineer at Crane Worldwide Logistics
Milwaukee, Wisconsin, United States
Summary
🤩
Rockstar🎓
Top SchoolJohn Wostenberg is a pragmatic software engineer with 13 years of experience who blends a deep passion for F# and functional programming with practical production work in C# and .NET ecosystems. He has contributed directly to the official F# compiler and prominent OSS projects like fable and NAudio, improving pattern matching diagnostics, cross-targeting builds, and file/path handling—work that impacts many F# users. Comfortable across backend, tooling, and CI/CD automation, he’s led migrations, designed APIs, and introduced build and DB tooling (FAKE, SqlHydra) while mentoring teams in F#. With a double major in Computer Science and Theatre Arts, he brings a collaborative, creative perspective to engineering and an ongoing appetite to explore languages such as Rust, Elixir, and Haskell.
13 years of coding experience
6 years of employment as a software developer
Bachelor of Arts - BA, Computer Science, Bachelor of Arts - BA, Computer Science at Benedictine College
Stackoverflow
3,574reputation
208kreached
82answers
57questions
Github Skills (35)
unit-testing10
filesystem10
msbuild10
compiler-development10
text-manipulation10
pattern-matching10
file-operations10
enums10
netframework10
netstandard10
compiler-compiler10
fileio10
dotnet-core10
compiler10
netcore10
Programming languages (13)
Github contributions (5)
dotnet/fsharp
Mar 2018 - Dec 2025
The F# compiler, F# core library, F# language service, and F# tooling integration for Visual Studio
Role in this project:
Back-end Developer
Back-end DeveloperContributions:24 reviews, 20 PRs, 128 comments in 7 years 11 months
Contributions summary:John primarily focused on improving the F# compiler, particularly in the area of pattern matching. They addressed incomplete enum match warnings by refining the counterexample generation process. This work involved modifying the compilation pipeline to provide more informative diagnostics and generate more accurate counterexamples. Additional commits included whitespace adjustments, and the implementation of the `match!` syntax.
compilercore-libraryvisual-studiofsharpnetcore
fsharp/fsharp
Mar 2018 - Jul 2018
Please file issues or pull requests here: https://github.com/dotnet/fsharp
Role in this project:Back-end Developer
Back-end DeveloperContributions:14 commits in 4 months
Contributions summary:John primarily contributed to the F# compiler, focusing on enhancements to the pattern matching functionality, specifically concerning enums. They implemented compiler warnings for incomplete enum matches, and improved the accuracy of the error messages, including the display of field names in incomplete pattern match scenarios. Additionally, the user made adjustments to code whitespace and included a new feature involving the `match!` syntax within the F# compiler's code base.
dotnetfsharp
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