Eungjun Yi
Server Developer at Toss Bank
Seoul, South Korea
Summary
🤩
Rockstar🎓
Top SchoolEungjun Yi is a seasoned server and web developer with 14+ years building developer-facing web applications and infrastructure at NAVER, Viva Republica, and Toss Bank. He brings deep expertise in Git internals, HTTP (including translating "HTTP: The Definitive Guide" into Korean) and Linux tooling, and has taught and presented on these topics at industry conferences. His hands-on work spans backend Java/PHP/Node.js services, front-end JavaScript, and DevOps improvements—evidenced by contributions to high-profile open-source projects like urllib3 and Mattermost where he improved HTTP retry behavior, SSO integrations, and Docker/Compose reliability. Colleagues know him for practical libraries (e.g., JS Git reader/writer and SVN checkout helpers) that bridge developer workflows and for simplifying complex systems into teachable practices.
14 years of coding experience
12 years of employment as a software developer
Bachelor of Science (BS) Electronic Engineering, Bachelor of Science (BS) Electronic Engineering at Ajou University
Japanese, English, Korean
Github Skills (31)
javascript10
docker10
postgresql10
python10
retrying10
http10
bash10
docker-compose10
httpc10
dockers10
mattermost10
http-client10
go10
retry-policy10
urllib10
Programming languages (13)
Github contributions (5)
mattermost/mattermost-docker
Nov 2015 - Nov 2016
Dockerfile for mattermost in production
Role in this project:
DevOps Engineer
DevOps EngineerContributions:73 commits, 15 PRs, 107 pushes in 1 year
Contributions summary:Eungjun primarily focused on configuring and maintaining the Docker environment for Mattermost. Their contributions involved creating and modifying Docker entrypoints, database setup scripts, and build processes. Key changes included addressing issues with configuration persistence, database connection management, and ensuring the application waited for the database to be ready. They also worked on unifying Docker Compose configurations and refining the Nginx setup.
dockerfilein-productiondockermattermostproduction
urllib3/urllib3
Jul 2016 - Sep 2016
urllib3 is a user-friendly HTTP client library for Python
Role in this project:Back-end Developer
Back-end DeveloperContributions:6 commits, 1 PR, 27 comments in 1 month
Contributions summary:Eungjun primarily contributed to the `urllib3` library by enhancing its HTTP client functionality, specifically around handling Retry-After headers for redirection and retries. They added support for respecting Retry-After headers in the AppEngineManager and implemented logic to handle redirect delays, including tests. The user also added a new test case to cover the scenario where the Retry-After header contains a past date.
thread-safehttp-librarypythonpoolinghttp-client
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