Hyangtackย Lee
Software Engineer at LINE Plus Corp
South Korea
Summary
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Top SchoolHyangtack Lee is a senior software engineer and tech lead with over a decade of backend experience, specializing in Java/Kotlin, asynchronous networking (Netty), reactive streams, and large-scale multimedia delivery and storage systems. He has driven migrations from Ruby on Rails to Kotlin/Spring Boot and Armeria, led global product launches, and served as both engineering manager and hands-on contributor. Notably, he contributed core features and connection-limiting internals to the popular Armeria microservice framework and implemented authentication/security for CentralDogma, reflecting deep expertise in open-source distributed systems. Comfortable across messaging, cache, and RDBMS ecosystems, he blends low-level C/C++ and systems work with modern JVM-based architectures. Based in South Korea, he pairs production-hardened operational experience with a track record of redesigning legacy platforms for scale and global reach.
11 years of coding experience
15 years of employment as a software developer
Master's degree, Computer Engineering, Master's degree, Computer Engineering at Ajou University
Github Skills (24)
netty10
back-end-development10
apidoc10
user-authentication10
authentication10
java10
security10
javas10
api10
configuration-management9
http9
spring-boot9
server9
concurrency9
server-side9
Programming languages (4)
Github contributions (5)
line/centraldogma
Sep 2017 - Jun 2019
Highly-available version-controlled service configuration repository based on Git, ZooKeeper and HTTP/2
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 releases, 70 commits, 79 PRs in 1 year 9 months
Contributions summary:Hyangtack primarily focused on implementing authentication and security features within the CentralDogma web service. They integrated Apache Shiro for authentication and authorization, adding dependencies and implementing the necessary services for session management and access control. Further contributions included adding API authentication, ensuring privileged API access was restricted to logged-in users and preventing access to internal projects, demonstrating a focus on securing the application. They also worked on improving the web UI.
vcsconfigurationconfiguration-serverversion-controlzookeeper
line/armeria
May 2017 - Jan 2022
Your go-to microservice framework for any situation, from the creator of Netty et al. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard.
Role in this project:Back-end Developer
Back-end DeveloperContributions:2 releases, 45 reviews, 111 commits in 4 years 9 months
Contributions summary:Hyangtack's commits focus on implementing and refactoring core features of the Armeria framework, specifically related to connection limiting and request processing. Their work includes removing unused configuration properties, adding a new handler to control the number of concurrent connections, and modifying server configuration settings. They demonstrate a deep understanding of the underlying architecture by making changes to core internal components such as the `ConnectionLimitingHandler` and `ServerConfig` classes.
rpcmicro-frameworkretrofitprotobuftype-of
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