I'm a Junior backend engineer and open source contributor(my hobby) on JUnit5, apache/seata, naver/fixture-monkey, and more. Currently a committer for apache/seata, and selected as a GSoC'25 contributor for a Kotlin & Gradle project.
Enjoy collaborating on projects, sharing knowledge, and continuously learning new technologies to improve my skills.

Recently, I’ve been particularly interested in Test code.
Test code is not just for validation-it also helps other developers understand how to use my code and serves as a guide for efficient refactoring, making it crucial for maintaining high-quality software.

I'm also exploring distributed transactions, especially their implementation and challenges in microservices architectures. It's a complex but fascinating area, and I’ve been sharing my thoughts in recent blog posts.

• JUnit5
  • Introduce feature flag for auto-closing AutoCloseable in Jupiter's ExtensionContext.Store #4452
  • Provide mechanism for managing resources across engines and executions #4281
  • Implement Parallel Method Execution in JUnit-Vintage engine #4242
  • Support parallelization in Junit-Vintage-engine #4135
  • Implement include and exclude filtering when calling registerAutoDetectedExtensions #4120
  • Add include matching on ClassNamePatternFilterUtils #4115
• spring-boot
  • Add Fail fast mechanism when both management base path and endpoint mapping are set to / #45251
  • Ensure DefaultErrorAttributes adds JSON serialization safe errors #43330
• apache-seata
  • Add ChannelEventListener support to prevent memory leaks #7337
  • Enforce account initialization and disable default credentials #7261
  • Use shared EventLoop for TM and RM clients to reduce thread overhead and improve performance #7179
  • Implement scheduled handling for end status transaction #7133
• apache-baremaps
  • Displaying boundaries and borders #948
  • Displaying building numbers #945
• naver/fixture-monkey
  • Implement Random Selection of Register Operations When Not Using selectName #1108
  • Implement a Matcher interface to manage ArbitraryBuilders with a single variable #1062
  • Add register and select ArbitraryBuilder by name #1036
• LG/fosslight
  • Refactor existing tox test to pytest #225
  • Change SCANOSS Invocation Method from Command Line to Library Function #178
  • Add simple_mode parameter to CoverItem constructor #108

• Spring 관점에서 보는 Seata의 내부 통신
• Apache Seata란?
• 내가 JUnit5에 글로벌 Extension 필터링 기능을 추가한 이야기
• 내가 JUnit5에 병렬화를 도입한 이야기 - 메서드 단위
• 내가 JUnit5에 병렬화를 도입한 이야기 - 클래스 단위

• Open Source Contribution
• Development Discussions
• Watching Soccer

• yongjunh@apache.org
• Let's have a virtual coffee ☕
• Resume
• Tech blog
• Linked.in