Radek Zikmund
Software Engineer II at Microsoft
Prague, Prague, Czechia
Summary
🤩
Rockstar🎓
Top SchoolRadek Zikmund is a Software Engineer II based in Prague with eight years of experience focused on networking and security in .NET Core, especially TLS/SSL, HTTP and QUIC. At Microsoft he contributes to the .NET runtime and popular projects like msquic, improving cross-platform QUIC behavior and C# interop for secure, high-performance networking. His background spans C++ simulator development and enterprise .NET systems, giving him a pragmatic full-stack systems perspective from low-level protocol details to application-facing APIs. Radek also strengthens quality through test automation and documentation work, ensuring examples and edge cases compile and behave correctly across Windows, Linux and macOS. A Charles University alumnus in Software and Data Engineering, he combines academic rigor with hands-on fixes that reveal a knack for making complex networking stacks robust and portable.
7 years of coding experience
6 years of employment as a software developer
Master's degree, Software and Data Engineering, Master's degree, Software and Data Engineering at Charles University
English, German, Czech
Github Skills (32)
c-language10
tls1210
net10
http10
dotnet10
cross-platform10
tls1310
network-programming10
networking10
netframework10
asp-net10
mtls10
quic10
dotnet-core10
libtls10
Programming languages (13)
Github contributions (5)
dotnet/runtime
Jan 2022 - Jan 2023
.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:715 reviews, 125 commits, 515 PRs in 11 months
Contributions summary:Radek primarily focused on improving the .NET runtime, specifically within the networking and security areas. Their contributions included fixing bugs related to script generation, certificate verification on multiple operating systems, and HTTP/3 stream handling. They also made a significant contribution in test automation, by adding test for various scenarios.
dotnetruntimelinuxcsharpxamarin
dotnet/dotnet-api-docs
Mar 2022 - Jan 2023
.NET API reference documentation (.NET 5+, .NET Core, .NET Framework)
Role in this project:Back-end Developer
Back-end DeveloperContributions:69 reviews, 45 commits, 100 PRs in 10 months
Contributions summary:Radek primarily contributed to the documentation and examples within the .NET API reference documentation repository. They focused on updating code snippets, fixing errors, and ensuring proper code functionality within the examples. Their work included unifying ports in SslStream examples, ensuring proper disposal of TcpClient and WebClient instances, and addressing various compilation issues across multiple example files. They also worked on a variety of bug fixes and code improvements.
apidotnetnet-frameworknet-corenet-5
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