L Pereira
Cheesemaker at Self
Seattle, Washington, Brazil
Summary
🤩
Rockstar🎓
Top SchoolL Pereira is a seasoned software engineer with 22 years of experience building high-performance backend systems and contributing to influential open-source projects. Based in Seattle and originally from Brazil, he has driven performance and portability improvements across projects like lwan (high-performance HTTP server), the .NET runtime, and SerenityOS. He has deep expertise in low-level optimization, build/test tooling, and cross-environment integration—evident from work such as RapidJSON adoption to speed host startup and auto-corking for pipelined responses. A frequent contributor to benchmarks and platform projects (TechEmpower, Crosswalk, SerenityOS), he blends systems-level thinking with pragmatic refactors that improve maintainability. His career spans senior engineering roles at Microsoft, Intel, Fastly and a brief stint at Google, showing consistent impact in large-scale engineering organizations. Outside code, an unexpected thread in his profile is a passion for cheesemaking, reflecting a hands-on, craft-oriented mindset.
22 years of coding experience
15 years of employment as a software developer
Bachelor of Engineering (B.E.) Computer Engineering, Bachelor of Engineering (B.E.) Computer Engineering at Pontifícia Universidade Católica de CampinasMechatronics Technician, Mechatronics Technician at SENAI Campinas - Roberto Mange
English, Portuguese
Github Skills (45)
json10
crosswalk10
benchmark10
c-language10
apidoc10
net10
linux10
dotnet10
benchmarking10
c1110
osdev10
c1710
asp-net10
kernel10
lua10
Programming languages (22)
Github contributions (5)
lpereira/lwan
Jan 2012 - Jan 2023
Experimental, scalable, high performance HTTP server
Role in this project:
Back-end Developer & Performance Engineer
Back-end Developer & Performance EngineerContributions:6 releases, 21 reviews, 3291 commits in 11 years 1 month
Contributions summary:L primarily focused on optimizing the HTTP server's performance and improving code efficiency. Their contributions included refactoring code to reduce cache pressure for MIME type lookups and further reducing the size of the parse_headers() function. In addition, they introduced auto-corking for pipelined responses to improve performance and addressed a regression in fuzz tests, improving the software's stability and efficiency. Furthermore, they optimized the hash table's efficiency.
golanghttp-performancescalableweb-serverlwan
lpereira/hardinfo
Jul 2003 - Dec 2021
System profiler and benchmark tool for Linux systems
Role in this project:Back-end Developer
Back-end DeveloperContributions:4 reviews, 858 commits, 359 PRs in 18 years 7 months
Contributions summary:L primarily contributed to code cleanups within the HardInfo system profiler and benchmark tool for Linux systems. These cleanups involved refactoring and improvements to existing code, specifically within the shell, report, and various module files, including those for memory, processors, and general functionality. The user also added features, such as adding support for reading information from the computer's memory, as well as a new benchmark and its display.
benchmarklinuxsystem-informationc
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.