Sam Harwell
Senior Software Engineer, .NET at Microsoft
Houston, Texas, United States
Summary
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Top expert inCross-Platform Development and Programming Languages
Sam Harwell is a Senior Software Engineer, .NET with 16 years of experience, based in Houston and working at Microsoft since 2017. He specializes in performance-sensitive backend .NET work—reducing allocations, tuning GC and CPU hotspots, and fixing threading/synchronization issues across high-profile projects like PerfView, Razor, and dotnet/runtime. Sam pairs compiler and tooling expertise (Roslyn, ILSpy, CsWin32) with low-level interop experience—adding safe-handle abstractions in TensorFlow.NET—and a knack for practical code generation improvements. He also brings strong DevOps and test-automation chops, having modernized build, CI and coverage workflows for MSBuild, project-system and other large repos. Educated in electrical engineering with graduate study at UT Austin, he combines systems-level rigor with a pragmatic focus on developer productivity.
17 years of coding experience
4 years of employment as a software developer
The University of Texas at Austin
Stackoverflow
98,855reputation
10.7mreached
1,534answers
56questions
grammar
top-1%
debugging
top-5%
dictionary
top-5%
console-application
top-5%
dynamic
top-5%
task-parallel-library
top-5%
Github Skills (193)
nuget10
parserator10
junit510
parser10
github10
multithreading10
abstract-syntax-tree10
testing10
net-standard-210
commandline-interface10
command-line-interface10
test-framework10
standardized10
instrumentation10
asp-net-core10
Programming languages (16)
Github contributions (5)
tunnelvisionlabs/antlr4ts
Oct 2016 - Jan 2021
Optimized TypeScript target for ANTLR 4
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 releases, 1 review, 717 commits in 4 years 3 months
Contributions summary:Sam primarily contributed to the core functionality and structure of the `antlr4ts` project, a TypeScript target for the ANTLR 4 parser generator. Their commits focused on enhancing data structures, particularly for hash sets. They extracted constants, refactored classes like `Array2DHashSet`, and implemented new interfaces such as `IntStream`. Furthermore, they expanded the functionality to support string values.
antlr-4optimizedantlr4antlrtypescript
DotNetAnalyzers/StyleCopAnalyzers
Nov 2014 - Dec 2022
An implementation of StyleCop rules using the .NET Compiler Platform
Role in this project:Back-end Developer
Back-end DeveloperContributions:65 releases, 307 reviews, 3086 commits in 8 years 2 months
Contributions summary:Sam contributed to the StyleCopAnalyzers project, specifically focusing on implementing and refining code analysis rules. Their work involved adding test cases for various code constructs, including array initializers, using declaration statements, and record types, and ensuring that these new code patterns were correctly handled by the analysis rules. The user also worked on improving the performance and accuracy of existing rules related to spacing, access modifiers, and parameter validation by implementing code fixes and refactoring some core logic, as well as enhancing the project's testing and code generation infrastructure, including supporting nullable reference types and ref returns.
roslyndotnetroslyn-analyzercompilercsharp
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