Ciro Spaciari
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolCiro Spaciari is a software engineer with nine years of experience building high-performance web applications and optimizing large online services, now based in San Francisco. He has led teams and shipped production systems that handle tens of millions of transactions annually, with a strong background in backend architectures, performance tuning, and cross-stack development from .NET to Python and Node. As a core contributor to Bun, he improved HTTP/HTTPS clients, proxy support, and WebSocket stability for a widely watched JavaScript runtime, and expanded Python framework benchmarks at TechEmpower to stress-test modern ASGI/WSGI setups. Comfortable both leading teams and diving into low-level server behavior, he combines pragmatic product focus with a knack for squeezing milliseconds out of critical paths. Colleagues describe him as a developer who brings entrepreneurial initiative—he’s founded a consultancy and repeatedly turned small projects into production-grade systems.
9 years of coding experience
14 years of employment as a software developer
UTFPR - Universidade Tecnologica Federal do Paraná
Portuguese, English
Stackoverflow
630reputation
55kreached
33answers
0questions
Github Skills (36)
application-framework10
javascript10
benchmark10
performance-monitor10
tls1210
python10
app-framework10
http10
benchmarking10
wsgi10
tls1310
networking10
mtls10
performance-analysis10
asgi10
Programming languages (15)
Github contributions (5)
oven-sh/bun
Oct 2022 - Jan 2023
Incredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one
Role in this project:
Back-end Developer
Back-end DeveloperContributions:647 reviews, 14 commits, 495 PRs in 2 months
Contributions summary:Ciro's commits primarily focused on enhancing the Bun JavaScript runtime. They worked on adding and improving HTTP proxy support by implementing features like HTTPS_PROXY and HTTP_PROXY and adding code to handle redirects. Furthermore, the user contributed to improvements to the file system, including implementing `fs.watch` on Windows and implementing methods on the DNS resolver. They also worked on fixing potential issues related to WebSocket connections, and implemented and fixed several issues in the core logic of the HTTP/HTTPS client.
runtimeexecutablejavascriptpackage-manageresmodules
TechEmpower/FrameworkBenchmarks
Nov 2022 - Jan 2023
Source for the TechEmpower Framework Benchmarks project
Role in this project:Backend Developer
Backend DeveloperContributions:2 reviews, 10 commits, 10 PRs in 2 months
Contributions summary:Ciro primarily contributed to adding and improving Python web framework benchmarks within the TechEmpower Framework Benchmarks project. They introduced benchmarks for the Socketify.py framework, including both ASGI and WSGI implementations, and integrated support for Falcon, Flask, Django, Emmett, and FastAPI with Socketify. Further, they optimized Socketify.py's performance by implementing object factories. These contributions significantly expanded the benchmark suite, testing a wider range of web frameworks and configurations.
techempowerframeworkbenchmarkperformancebenchmarks
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