Jay Feldblum
Software Engineer at Facebook
San Jose, California, United States
Summary
🤩
Rockstar🎓
Top SchoolJay Feldblum is a seasoned software engineer with 12 years of experience building and modernizing high-performance C++ systems, currently based in San Jose and working at Facebook since 2015. He specializes in backend engineering for networking, transport, and infrastructure projects—contributing to prominent open-source repositories such as mvfst (QUIC), folly, and fbthrift—where he focuses on performance, reliability, and migration to modern C++ practices. His work spans core protocol implementations, distributed systems, and build/CI improvements, often chipping away at technical debt to boost maintainability and compilation performance. Prior to Facebook he combined technical leadership and product-facing responsibilities as Associate Director of Technology and Business, giving him a pragmatic perspective on shipping production-grade software. Colleagues would note his attention to subtle code-quality improvements (e.g., reducing compilation overhead via template and iteration refactors) that yield outsized maintenance and runtime wins.
12 years of coding experience
8 years of employment as a software developer
Johns Hopkins University
Github Skills (82)
dependency-management10
mobile-development10
package-management10
testing10
http10
proxy10
cmake10
data-management10
refactor10
ubuntu10
c1710
code-migration10
network-protocol10
build-automation10
refactoring10
Programming languages (13)
Github contributions (5)
facebook/folly
Mar 2014 - Jan 2023
An open-source C++ library developed and used at Facebook.
Role in this project:
Back-end Developer & Library Maintainer
Back-end Developer & Library MaintainerContributions:53 reviews, 1673 commits, 85 PRs in 9 years
Contributions summary:Jay focused on improving the `folly/folly` C++ library, implementing new features, performing performance optimizations, and addressing compilation issues. Their contributions included private inheritance for the `fbstring` and `Range` formatters, the addition of the `to_integral` utility, and code refactoring to improve efficiency. They also fixed several build failures, resolved deprecation warnings, and improved the overall code quality and maintainability of the library.
facebookcppc-library
facebook/fbthrift
Jul 2014 - Jan 2023
Facebook's branch of Apache Thrift, including a new C++ server.
Role in this project:Back-end Developer
Back-end DeveloperContributions:7 reviews, 1041 commits, 12 PRs in 8 years 7 months
Contributions summary:Jay's commits primarily focus on the modification and improvement of Thrift code. The contributions include cutting extra parentheses in cpp2 struct generated `operator==`, implementing a string overload of `json_quote_ascii`, addressing inconsistencies in test code, and improving efficiency in the processing of code. The changes span a range of files within the project, indicating a broad understanding of the codebase.
cppapache-thriftc-plus-plusapachefacebook
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