Julie Lee
Principal Engineering Manager at Microsoft
Redmond, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolJulie Lee is a Principal Engineering Manager at Microsoft with a focused expertise in JIT technology for the .NET runtime, bringing five years in senior engineering leadership and over a decade of wireless research and systems experience from Intel. She has driven cross-geo lab builds, 5G and LTE algorithm design, and operator/vendor programs that led to standards contributions and patent filings, demonstrating rare depth across both low-level systems and telecommunications. At Microsoft she contributes to the dotnet/runtime open-source project, optimizing JIT code generation and boolean/arithmetic instruction selection to measurably improve runtime performance. Julie pairs hands-on compiler work with people leadership, coaching teams to ship high-performance runtime features while maintaining correctness through rigorous test development. Based in Redmond, she holds advanced degrees in computer science and combines academic rigor with practical product delivery, often surfacing subtle optimization opportunities that yield outsized system gains.
6 years of coding experience
14 years of employment as a software developer
B.S., Computer Science, B.S., Computer Science at Ewha Womans UniversityM.S., Computer Science, M.S., Computer Science at Portland State University
Github Skills (15)
compiler-optimization10
net10
asp-net10
compiler10
dotnet10
c-language10
cprogramming-language10
jit10
compile10
optimization9
optimisation9
numerical-optimization9
algorithm9
code-optimization9
algorithms9
Programming languages (7)
Github contributions (5)
dotnet/runtime
Nov 2020 - May 2022
.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:223 reviews, 5 commits, 62 PRs in 1 year 6 months
Contributions summary:Julie contributed to optimizing the .NET runtime, specifically focusing on improving code generation and performance. Their work includes arithmetic optimizations, such as GT_NEG simplification, and boolean logic optimizations. The user also introduced and refined test cases to validate the correctness of these optimizations. Furthermore, the user worked on improving the JIT compiler's efficiency through instruction selection and code cleanup.
dotnetiotmobile
JulieLeeMSFT/runtime
Oct 2020 - Jun 2026
.NET is a cross-platform runtime for cloud, IoT, and desktop apps.
Contributions:1 review, 1 PR, 113 pushes in 5 years 9 months
dotnetiot
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