Hao Sun
Senior Software Engineer at NVIDIA
Shanghai, Shanghai, China
Summary
🤩
Rockstar🎓
Top SchoolHao Sun is a Senior Software Engineer and OpenJDK committer with 10 years of systems and compiler-focused experience, currently working on AArch64 backend implementation and optimization at NVIDIA. He co-authored the PHP JIT AArch64 backend and has driven PAC/BTI enablement and numerous high-impact patches in the OpenJDK mainline, demonstrating deep expertise in low-level code generation and platform-specific optimization. His background includes performance engineering for 5G/ADS at Huawei, automated bug detection and taint/fuzzing research at Alibaba (resulting in 20+ CVEs), and a PhD in Computer Science from Nanjing University. Hao’s contributions include resolving AArch64 build failures, stabilizing JVM optimizations, and improving assembler and exception-handler subsystems—work that reflects both meticulous debugging and large-scale codebase stewardship. Based in Shanghai, he blends academic rigor with production-grade systems engineering and a knack for surfacing subtle, architecture-specific defects before they reach users.
10 years of coding experience
7 years of employment as a software developer
Doctor of Philosophy - PhD, Computer Science, Doctor of Philosophy - PhD, Computer Science at Nanjing University
Github Skills (9)
javas10
arm10
openjdk10
jvm10
java10
compiler-optimization9
assembler8
cprogramming-language7
c-language7
Programming languages (6)
Github contributions (5)
openjdk/jdk
Nov 2020 - Mar 2025
JDK main-line development https://openjdk.org/projects/jdk
Role in this project:
Back-end Developer
Back-end DeveloperContributions:141 reviews, 39 PRs, 229 comments in 4 years 4 months
Contributions summary:Hao primarily focused on fixing build issues and optimizing the OpenJDK codebase. Their contributions included resolving AArch64 build failures, addressing issues with minimal builds, and correcting code that was causing optimization instability. They also worked on improving exception handler table dumps and revising assembler instructions. This work demonstrates their expertise in system-level programming and compiler optimization within the Java Virtual Machine.
openjdkjavajvmjdk
shqking/jdk
Nov 2020 - Feb 2025
JDK main-line development
Contributions:97 pushes, 88 branches in 4 years 4 months
javajvmjdk
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