Amit Kumar
Development Team Lead, OpenJDK On IBM-Z
Bengaluru, Karnataka, India
Summary
🤩
Rockstar🎓
Top SchoolAmit Kumar is a Development Team Lead and OpenJDK committer with 8 years of experience, specializing in porting and optimizing the HotSpot JVM for IBM s390x (IBM-Z) architectures. He leads the s390x Port project, driving platform-specific JEP ports and runtime improvements—ranging from G1 late barrier expansion to recursive object locking and relocation of constant pool data—to ensure reliable builds and performant runtimes. Known for fixing complex build breaks, reducing test times, and reshaping core register and locking representations, he combines systems-level C++ expertise with pragmatic engineering that benefits the broader OpenJDK mainline. Based in Bengaluru, he pairs his open-source stewardship with a curious mindset—continuously learning advanced C++ concepts and honing problem-solving through competitive programming.
8 years of coding experience
2 years of employment as a software developer
Bachelor of Technology - BTech, Computer Science, 8.38, Bachelor of Technology - BTech, Computer Science, 8.38 at Arya College of Engineering and IT
English, Hindi
Stackoverflow
46reputation
5kreached
3answers
1question
Github Skills (12)
javas10
openjdk10
jvm10
java10
cprogramming-language9
debug9
c-language9
debugging9
build-system8
performance-optimization8
debouncing6
compiler-errors6
Programming languages (3)
Github contributions (5)
openjdk/jdk
Nov 2022 - Mar 2025
JDK main-line development https://openjdk.org/projects/jdk
Role in this project:
Back-end Developer
Back-end DeveloperContributions:271 reviews, 92 PRs, 705 comments in 2 years 4 months
Contributions summary:Amit primarily contributed to the OpenJDK/jdk project, focusing on the s390 architecture. Their work involved fixing bugs, improving code efficiency, and implementing features specific to the s390 platform. The user's contributions included modifying configuration scripts, optimizing build processes, and addressing issues in areas like HotSpot and the template interpreter. They also made code changes related to the Java Native Interface (JNI).
openjdkjavajvmjdk
offamitkumar/Kattis
May 2020 - Jul 2020
Contributions:217 commits, 178 pushes, 1 branch in 2 months
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