Junho Choi
Director, Systems Engineering at Coupang Pay
Seoul, South Korea
Summary
🤩
Rockstar🎓
Top SchoolJunho Choi is a seasoned systems engineering leader and CDN protocol expert with 20+ years building global content delivery, streaming, and mobile acceleration platforms. He has led technical teams from startup founder/CTO roles to director-level leadership at Coupang Pay, combining product ownership with hands-on systems and network engineering. At Cloudflare he implemented and tuned QUIC and HTTP/3 features—contributing congestion control algorithms and deployments in the widely used quiche project—and has authored related IETF work. His background spans FreeBSD ports contribution, low-level transport protocol design (Neumob Protocol), and large-scale CDN operations across APAC and the US. Known for squeezing performance from the stack, he pairs pragmatic system design with measurable production improvements and a knack for cross-team technical integration. Based in Seoul, he thrives on turning protocol research and open-source contributions into resilient, global high-performance services.
12 years of coding experience
24 years of employment as a software developer
MS Computer Science, MS Computer Science at Seoul National University
Korean, English, Japanese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (5)
http10
protocols10
rust10
quic10
network-programming10
Programming languages (17)
Github contributions (5)
cloudflare/quiche
Apr 2019 - Oct 2022
🥧 Savoury implementation of the QUIC transport protocol and HTTP/3
Role in this project:
Back-end Developer
Back-end DeveloperContributions:258 reviews, 172 commits, 194 PRs in 3 years 6 months
Contributions summary:Junho primarily contributed to example programs within the `quiche` repository, focusing on enhancing the functionality and build process of the QUIC transport protocol implementation. Their commits addressed build errors on macOS, improved IP address binding in client examples, and added support for Android and iOS targets. They also added request headers to the HTTP/3 client example.
quichttp3protocolrustnetwork-programming
freebsd-kr/www
Feb 2021 - Mar 2025
Site contents of www.kr.freebsd.org
Contributions:2 PRs, 45 pushes, 2 branches in 4 years 2 months
contentsfreebsdhugo
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