Tatsuhiro Tsujikawa
Software Engineer at LY Corporation
Japan
Summary
🤩
Rockstar🎓
Top School
Top expert inCross-Platform Media and Privacy Tools Development
Tatsuhiro Tsujikawa is a seasoned software engineer with 20 years of experience specializing in systems programming using C/C++ and Go, currently building container-based automation for hundreds of Kubernetes clusters. He is a lead developer on widely used open-source projects implementing HTTP/2, QUIC and HTTP/3 (nghttp2, ngtcp2, nghttp3), demonstrating deep protocol and transport-layer expertise. His contributions span security-sensitive libraries like OpenSSL and curl as well as tooling such as aria2 and a WebSocket library, reflecting strong attention to correctness and interoperability. A former researcher in web crawling and log analysis, he brings both applied R&D experience and production-grade engineering to networking and distributed systems. Based in Japan, he combines low-level protocol craftsmanship with practical cloud/container infrastructure delivery.
20 years of coding experience
23 years of employment as a software developer
Master, Computer science, Master, Computer science at Graduate School of Osaka university
Stackoverflow
404reputation
498kreached
9answers
0questions
Github Skills (47)
unit-testing10
ssl10
tls1210
http10
websocket10
c1110
decode10
tls1310
implement10
decoding10
security10
c1710
mtls10
websockets-client10
network-protocol10
Programming languages (15)
Github contributions (5)
ngtcp2/ngtcp2
Nov 2016 - Jan 2023
ngtcp2 project is an effort to implement IETF QUIC protocol
Role in this project:
Back-end Developer
Back-end DeveloperContributions:28 releases, 47 reviews, 3449 commits in 6 years 3 months
Contributions summary:Tatsuhiro primarily contributed to the ngtcp2 project, focusing on the implementation and enhancement of the QUIC protocol. Their work involved addressing transport parameter errors, handling connection closure mechanisms, and incorporating features like version negotiation and improved packet handling. They refactored code related to the handling of stream data, and updated the project's documentation. The user demonstrated a solid understanding of networking protocols, C programming, and the internal workings of QUIC.
quiceffortprotocolnetworkingudp
aria2/aria2
Feb 2006 - Aug 2022
aria2 is a lightweight multi-protocol & multi-source, cross platform download utility operated in command-line. It supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink.
Role in this project:Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:23 releases, 5085 commits, 245 PRs in 16 years 9 months
Contributions summary:Tatsuhiro primarily focused on implementing and improving the BitTorrent functionality within the aria2 project. Their commits centered around introducing new APIs for retrieving BitTorrent metadata, enhancing the handling of HTTP responses, and refining the handling of potential errors in the protocol. Notably, the user addressed a potential security vulnerability by improving the way the server handled a 30X HTTP response.
downloadrpcmulti-sourcemulti-protocolsftp
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