Billy O'neal
Principal Software Development Engineer at Microsoft
Redmond, Washington, United States
Summary
🤩
Rockstar
Top expert inModern C++ Development and Cross-Platform Computing
Billy O'Neal is a Principal Software Development Engineer at Microsoft with 15 years of experience building and hardening C++ infrastructure and developer tooling. He has deep expertise in standard library and package management internals, contributing to high-profile projects like MSVC's STL, libc++ and the microsoft/vcpkg ecosystem while improving CI/CD, build pipelines, and tooling reliability. Billy blends systems-level C++ fixes with DevOps work—parallelizing clang-format enforcement, provisioning Azure VMSS images, and streamlining artifact builds—to make large codebases more maintainable and reproducible. His open-source contributions also include robust networking and HTTP client improvements (IXWebSocket, cpprestsdk), showing attention to security, correctness, and edge-case behavior. Based in Redmond, he pairs pragmatic engineering with a preference for behind-the-scenes infrastructure improvements that quietly raise team velocity.
14 years of coding experience
Github Skills (32)
asynchronous10
cpp-library10
debug10
c-language10
ssl10
tls1210
testing10
memory-management10
http10
build-system10
websocket10
cmake10
clang-format10
tls1310
cicd10
Programming languages (22)
Github contributions (5)
microsoft/vcpkg
Apr 2018 - Jan 2023
C++ Library Manager for Windows, Linux, and MacOS
Role in this project:
Back-end Developer
Back-end DeveloperContributions:43 releases, 3229 reviews, 383 commits in 4 years 10 months
Contributions summary:Billy's commits indicate a focus on C++ library management within the `microsoft/vcpkg` repository. The user removed calls to non-existent members of `std::fpos`, a change related to code correctness, and modified various functions to employ `remove_if` instead of `partition` for performance improvements. Further contributions involved updating dependencies such as `cpprestsdk` and `libjpeg`, allowing the user to interact with build systems, and modifying cmake settings. The user also added support for environment variables in the downloads folder configuration.
c-plus-plussetuptoolspackage-managermacoscplusplus
microsoft/cpprestsdk
Aug 2018 - Jan 2021
The C++ REST SDK is a Microsoft project for cloud-based client-server communication in native code using a modern asynchronous C++ API design. This project aims to help C++ developers connect to and interact with services.
Role in this project:Back-end Developer
Back-end DeveloperContributions:9 releases, 4 reviews, 106 commits in 2 years 6 months
Contributions summary:Billy primarily focused on refactoring and improving the C++ REST SDK, specifically within the HTTP client implementation. A significant contribution involved removing unused functionalities from `_http_client_communicator`. The user also added test cases for handling SSL certificate validation and other related scenarios, demonstrating a focus on improving the robustness and security of the HTTP client. Furthermore, the user worked on refactoring code to unify and improve date formatting and parsing.
client-serverserver-client-communicationasyncmicrosoftcpp-library
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