John Call
Principal Software Architect at Microsoft
Seattle, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolJohn Call is a Principal Software Architect at Microsoft with nine years of professional experience building high-performance cloud and backend systems from Seattle. He combines deep .NET runtime expertise with practical architecture leadership, contributing performance optimizations to core repos like dotnet/runtime (notably improving String.Join for IList<string> and SortedDictionary copy operations). A former research intern at Epic with an MS from University of Wisconsin–Madison and a BS from University of Minnesota, he blends academic rigor with production-scale engineering. He focuses on making foundational libraries faster and clearer, evidenced by both performance tuning and improved code documentation. Colleagues rely on him to translate low-level improvements into measurable system gains across Azure-related projects.
9 years of coding experience
2 years of employment as a software developer
Bachelor of Science (B.S.) Computer Science, Bachelor of Science (B.S.) Computer Science at University of MinnesotaMaster of Science (MS) Computer Science, Master of Science (MS) Computer Science at University of Wisconsin-Madison
Github Skills (12)
algorithm10
net10
asp-net10
data-structures10
algorithms10
dotnet10
csharp10
performance-optimization10
data-structure10
dotnet-core10
dotnet-new9
unit-testing9
Programming languages (13)
Github contributions (5)
dotnet/runtime
Nov 2020 - Oct 2021
.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:18 reviews, 6 commits, 8 PRs in 11 months
Contributions summary:John contributed to optimizing the `String.Join` method within the .NET runtime, specifically focusing on performance improvements for `IList<string>`. They also made enhancements to `SortedDictionary` copy operations, optimizing its performance. Furthermore, the user added parameter descriptions to the codebase, improving code clarity and maintainability. These changes indicate a focus on improving the efficiency and usability of core .NET libraries.
dotnetruntimelinuxcsharpxamarin
johnthcall/azure-docs
Nov 2016 - Jul 2024
Contributions:5 pushes, 1 branch in 7 years 9 months
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