• How LINE OpenChat Server Handles x100 Extream Traffic Spikes, LINE&Yahoo Japan tech-verse 2022
• LINE OpenSource Sprint 2023 - Armeria MVP

I'm LINE OpenChat backend engineer and open source contributor(my hobby) on LINE/armeria, spring-framework, spring-batch, reactor-core..

Also participated in 2 start-up as founding member for 3 years.

• LINE/armeria (15+ new feature)
  • Add AsyncLoader to load and update value periodically #5590
  • Add CompositeHttpHeaders that wraps HttpHeaders without expensive copy operations #5340
  • Add StreamMessage(reactive-streams, async) <-> InputStream, OutputStream(sync) converter #4703
  • Add SurroundingPublisher that can add head or tail item on Publisher(reactive-streams) #4727
  • Set RequestContext.isTimedOut(true) on DNS, session, write timeout #5156
• spring-framework
  • Support sending large STOMP messages as fragmented frames on WebSocketStompClient #31970
  • Fix DefaultDataBuffer#getNativeBuffer() to set correct limit #32009
  • WebClient and RestClient's defaultRequest(..) is not invoked early enough #32053
  • ImportSelector#getExclusionFilter does not exclude matching candidates with import selector #27080
• spring-batch
  • Fix FlowBuilder.next().end() infinite loop #4475
  • Support full regular expression on PatterMatcher.match() #4492
  • Fix SystemCommandTasklet to propagate error when exit status is failed #4566
• reactor-core
  • Add AutoCloseable shourtcut on Flux#using, Mono#using #3704
  • Throw wrapped TimeoutException on Mono.block* and Flux.block* #3733
  • expandDeep uses unbounded queue which results in OutOfMemoryException #3411
• netty
  • Make ScheduledEventExecutor task scheduler pluggable #13552
• resilience4j
  • Add startedTime configuration on RateLimiter #2100
• apache-pekko
  • Add AutoCloseable shortcut on mapWithResource #1053
• angular
  • fix(core): Fix decimal pipe floating point formatting bug #53730
• OpenSource Mentoring leader at GDG songdo
  • Help 70+ developers to open first PR on open-source they want (Next.js, react, angular, flutter, spring, k8s, ..)
  • Make 100+ PRs together, 30+ PRs are merged now :)

• Large/Burst traffic handling and distributed system architecture
• Open Source Contribution
• Documentation, visualization, communication
• Band (🎷Saxophone player)

• [email protected]
  • ☕ I like coffee chat! feel free to mail me when you want 🙂
• About me blog
• Linked.in
• organizer