Taejin Koo
소프트웨어 엔지니어 at Viva Republica (Toss)
Yongin-si, South Korea
Summary
🤩
Rockstar🎓
Top SchoolTaejin Koo is a seasoned software engineer with 12 years of experience in designing and operating high-throughput, distributed systems, currently leading the Server Platform Team at Viva Republica (Toss). He spent eight years at NAVER as a core contributor and maintainer of the pinpoint APM project, building stream-based virtual channels, agent lifecycle and clustering, and a gRPC-based communication layer capable of handling millions of requests per second. His expertise spans Java, Spring, NIO, multithreading, Thrift/gRPC, HBase and connection pool instrumentation, and includes deep performance and memory tuning for production-scale services. Taejin combines hands-on engineering with platform leadership, driving reliable observability and plugin ecosystems for large-scale systems. An understated strength is his focus on maintainability and compliance—evident from targeted licensing, formatting, and CI improvements in prominent open-source repos.
12 years of coding experience
13 years of employment as a software developer
Computer Teacher Education, Computer Teacher Education at 한양대학교
Github Skills (6)
javas10
codebase10
maintenance10
licensing10
java10
thrift9
Programming languages (3)
Github contributions (5)
pinpoint-apm/pinpoint
Apr 2014 - Dec 2022
APM, (Application Performance Management) tool for large-scale distributed systems.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:56 releases, 23 reviews, 1230 commits in 8 years 9 months
Contributions summary:Taejin primarily worked on bug fixes and improvements related to the codebase's licensing and codebase. The commits reveal a focus on ensuring proper formatting and adherence to licensing standards. These changes involved modifications to Java files within the collector and related code in the rpc and thrift. The user also updated the project version.
performance-managementmanagement-toolmonitoringapplication-performance-managementlarge-scale
koo-taejin/pinpoint-plugin-sample
Dec 2015 - Jul 2020
Pinpoint(https://github.com/naver/pinpoint) profiler plugin sample
Contributions:5 pushes, 8 branches in 4 years 7 months
naverpinpointplugin
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