Yasumasa Suenaga
Technical Lead at NTT DATA
Japan
Summary
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RockstarYasumasa Suenaga is a Technical Lead with 12 years of experience specializing in OpenJDK development, build/test automation, and JVM diagnostics. As an OpenJDK reviewer and IcedTea committer, he has a proven track record fixing core JDK bugs and enhancing test coverage in one of the most prominent Java projects. He led and architected HeapStats at the NTT OSS Center—an award-winning JVM tooling project that won a Duke's Choice Award and earned him speaking slots at JavaOne and Java Day Tokyo. At NTT DATA he combines hands-on engineering with team leadership to deliver robust backend systems and CI/test automation. His GitHub and Docker presence reflect continuous open-source involvement and practical tooling for JVM observability. Colleagues describe him as a pragmatic engineer who turns deep platform knowledge into reliable developer-facing tools.
12 years of coding experience
13 years of employment as a software developer
Japanese
Github Skills (8)
javas10
jvmti10
debug10
c-language10
jvm10
cprogramming-language10
java10
testing10
Programming languages (14)
Github contributions (5)
openjdk/jdk
Sep 2020 - Jan 2025
JDK main-line development https://openjdk.org/projects/jdk
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:190 reviews, 103 PRs, 548 comments in 4 years 5 months
Contributions summary:Yasumasa primarily contributed to the OpenJDK project by fixing bugs related to build warnings and incorrect functionality in the codebase. Their contributions involved modifications to core files and test files, demonstrating a focus on addressing identified issues and ensuring code correctness. The user also worked on improving tests by adding missing tests for various Java APIs.
openjdkjavajvmjdk
HeapStats/SamplePlugin
Sep 2015 - Nov 2019
Contributions:1 PR, 3 pushes, 5 branches in 4 years 2 months
plugin
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