Ichito Nagata
Staff Software Engineer at Fastly
Tokyo, Japan
Summary
🤩
Rockstar🎓
Top SchoolIchito Nagata is a Staff Software Engineer based in Tokyo with 13 years of experience building high-performance backend systems and protocol-level software. At Fastly he progressed from Senior to Staff Engineer, driving improvements in HTTP server behavior, proxying, and dynamic configuration that optimize real-world traffic handling. He is an active open-source contributor to notable projects such as H2O (HTTP/2/3 server), picohttpparser, and mruby, focusing on robustness, parsing edge cases, and VM correctness. His work shows a pattern of pragmatic fixes paired with thorough testing, from handling subtle HTTP whitespace/parsing issues to VM stack and memory adjustments. Ichito combines deep C-level systems knowledge with production engineering at scale, and often surfaces non-obvious correctness fixes that prevent rare but impactful failures. Trained at the University of Tokyo, he brings academic rigor to operational reliability and protocol engineering.
13 years of coding experience
6 years of employment as a software developer
University of Tokyo
Github Skills (17)
testing10
http10
virtual-machine10
c1110
ruby10
c1710
httpd-server10
http-server10
parse10
mruby10
architecture9
network-programming9
architectures9
hashtable9
performance-optimization8
Programming languages (7)
Github contributions (5)
h2o/h2o
Sep 2016 - Oct 2022
H2O - the optimized HTTP/1, HTTP/2, HTTP/3 server
Role in this project:
Back-end Developer
Back-end DeveloperContributions:99 reviews, 1037 commits, 225 PRs in 6 years 2 months
Contributions summary:Ichito's commits primarily involve improvements and bug fixes to the `H2O` HTTP/2 server, specifically focusing on the configuration and operation of its HTTP/2 and HTTP/1.1 handlers. The user implemented features for the dynamic configuration of error documents with multiple status codes and optimized the handling of HTTP requests, likely improving the server's efficiency. Furthermore, they implemented and improved code handling to enable accurate proxy operations.
h2ohttp-clientfiddlerhttp2optimized
h2o/picohttpparser
Oct 2018 - May 2019
tiny HTTP parser written in C (used in HTTP::Parser::XS et al.)
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 review, 9 commits, 6 PRs in 6 months
Contributions summary:Ichito's contributions focus on refining the picohttpparser library. They addressed issues by removing trailing spaces in header values and accepting multiple whitespaces between tokens for improved robustness. The user also made enhancements related to parsing HTTP responses, including handling missing whitespace after the status code and checking for empty method and path. The commits also included adding related tests.
http-parserhttp-headertinyparser
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