Maoni Stephens
Software Engineer at Microsoft
Greater Seattle Area United States
Summary
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RockstarMaoni Stephens is a software engineer with 11 years of hands-on experience focused on low-level runtime and memory systems, currently working at Microsoft in the Greater Seattle area. She has deep expertise in .NET garbage collection and performance tooling, contributing substantive enhancements to high-profile open-source projects like dotnet/runtime and PerfView to improve GC diagnostics, pause analysis, and memory-pressure tracking. Her work spans bug fixes, allocator tuning (LOH/SOH), and enabling diagnostics that help teams understand OOMs and background GC behavior—skills that sit at the intersection of systems programming and observability. Comfortable in core runtime code (coreclr/gc), she brings a pragmatic approach to complex concurrency and memory-limit problems and a track record of shipping impactful, behind-the-scenes performance improvements.
11 years of coding experience
Github Skills (20)
debugging10
debug10
c-language10
performance-monitor10
windows10
net10
memory-management10
dotnet-new10
dotnet10
asp-net10
performance-analysis10
performance-optimization10
dotnet-core10
cprogramming-language10
csharp10
Programming languages (7)
Github contributions (5)
microsoft/perfview
Sep 2016 - Jul 2021
PerfView is a CPU and memory performance-analysis tool
Role in this project:
Back-end Developer & Performance Engineer
Back-end Developer & Performance EngineerContributions:55 reviews, 7 commits, 10 PRs in 4 years 10 months
Contributions summary:Maoni focused on enhancing the performance analysis capabilities of the PerfView tool by adding support for detailed events related to garbage collection (GC) in the .NET runtime. They introduced handling for background GC events and incorporated features for analyzing the pause modes, heap history, and memory pressure related to GC events. These contributions included code modifications to process new event types and expose additional information for performance analysis, as well as bug fixes and the enabling of new analysis capabilities.
cpumemorydotnetperformance-analysiswindows
dotnet/runtime
Jan 2015 - Oct 2022
.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.
Role in this project:Back-end Developer
Back-end DeveloperContributions:884 reviews, 107 commits, 177 PRs in 7 years 9 months
Contributions summary:Maoni primarily focused on improving the garbage collection (GC) subsystem within the .NET runtime. Their contributions included the implementation of new features, such as the ability to track and add more detail to memory allocation, improving the diagnostic information around OOM, tuning BGC using free lists, as well as various code cleanups and bug fixes related to the GC process. They modified code within the coreclr, specifically in the gc and gcpriv, source directories and related headers, and also address issues related to thread suspension and memory limits.
dotnetruntimelinuxcsharpxamarin
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