Andrew Ayers
Principal Software Development Engineer at Microsoft
Newport, Oregon, United States
Summary
🤩
Rockstar🎓
Top SchoolAndrew Ayers is a Principal Software Development Engineer and compiler architect with 11+ years at Microsoft building and optimizing JIT and AOT toolchains for .NET, including visible contributions to core projects like CoreRT, LLILC and the dotnet/runtime. He specializes in inlining, profile-guided and whole-program optimizations, binary analysis, and practical codegen improvements that measurably improve runtime performance and stability. His work spans deep backend fixes—sign-extension and intrinsic support, aggressive inlining, retyping expressions in the JIT—to higher-level linker and layout strategies developed over decades of compiler engineering. A PhD-trained engineer with roots in HP’s optimizer and a founder who reverse-engineered mainframe binaries, he blends academic rigor with hands-on systems pragmatism. Based in Newport, Oregon, he is a consistent open-source contributor focused on making production runtimes faster and more robust.
11 years of coding experience
21 years of employment as a software developer
PhD, Electrical Engineering / Computer Science, PhD, Electrical Engineering / Computer Science at Massachusetts Institute of TechnologyBSEE, Electrical Engineering, BSEE, Electrical Engineering at University of Colorado Boulder
Stackoverflow
912reputation
33kreached
17answers
0questions
Github Skills (28)
c-language10
llvm10
code-generation10
performance-optimization10
compile10
dotnet-core10
performance-tuning10
netcore10
cprogramming-language10
csharp10
jit10
flow-control9
control-flow9
reverse-engineering9
run-time8
Programming languages (6)
Github contributions (5)
dotnet/llilc
Feb 2015 - Mar 2022
This repo contains LLILC, an LLVM based compiler for .NET Core. It includes a set of cross-platform .NET code generation tools that enables compilation of MSIL byte code to LLVM supported platforms.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:199 commits, 133 PRs, 69 pushes in 7 years 2 months
Contributions summary:Andrew primarily contributed to the LLILC compiler for .NET Core by addressing code generation issues. Their work involved fixing sign extensions in integer conversions, updating build paths, and implementing core functionalities for method-related operations. They also implemented support for the `abs` and `sqrt` intrinsics. Additionally, they resolved issues with load operations and fixed memory leaks.
bytecodecode-generationcompilerdotnetllvm
dotnet/runtime
Apr 2015 - Jan 2023
.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.
Role in this project:Back-end Developer
Back-end DeveloperContributions:2491 reviews, 945 commits, 1543 PRs in 7 years 10 months
Contributions summary:Andrew contributed to the .NET runtime repository by modifying and improving JIT compiler code. Their work involved refactoring, performance optimization, and extending the JIT's capabilities for various cases including OSR methods, profile incorporation, and handling specific edge cases related to memory and variable handling. The user's contributions were primarily focused on enhancing code generation and control flow analysis within the JIT compiler, aimed at improving performance and addressing potential issues. They also implemented and tested new functionalities to support and refine existing features.
dotnetiotmobile
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