Jesper Wilhelmsson
Software Development Manager at Oracle
Uppsala, Sweden
Summary
🤩
Rockstar🎓
Top SchoolJesper Wilhelmsson is a Software Development Manager at Oracle with over 15 years of hands-on software engineering experience and a career-long focus on problem solving that began with his first computer in 1984. He combines JVM back-end expertise—contributing to OpenJDK’s core hotspots and architecture-specific optimizations—with growing leadership responsibilities steering teams and projects. A skilled communicator and educator, he has taught at university level and regularly writes documentation, forum answers and even lyrics, turning technical complexity into clear explanations. Based in Uppsala, Sweden, he holds an M.Sc. from Uppsala University and leads the OpenJDK Developers' Guide as JDK GateKeeper and project lead. Outside of software he prototypes practical inventions with frequent 3D printing, reflecting a practical, maker-oriented approach to problem solving.
15 years of coding experience
De la GardiegymnasietM.Sc., M.Sc. at Uppsala University
Swedish, English
Github Skills (9)
arm10
compiler10
assembly10
c-language10
jvm10
cprogramming-language10
performance-optimization9
javas4
java4
Programming languages (4)
Github contributions (5)
openjdk/jdk
Feb 2020 - Mar 2025
JDK main-line development https://openjdk.org/projects/jdk
Role in this project:
Back-end Developer
Back-end DeveloperContributions:12 reviews, 131 PRs, 297 comments in 5 years 2 months
Contributions summary:Jesper's commits primarily involve changes to `src/hotspot/share/code/relocInfo.hpp`, `src/hotspot/cpu/x86/vm_version_x86.cpp`, and `src/hotspot/share/jvmci/jvmciCodeInstaller.cpp` files within the openjdk/jdk repository. These modifications suggest involvement in areas such as processor version detection, implementing compiler optimizations, and modifying the code's structure and code patching, which are key aspects of JVM back-end development. The changes also suggest some involvement in supporting architecture specifics.
openjdkjavajvmjdk
openjdk/guide
May 2020 - Jan 2023
OpenJDK Developers' Guide https://openjdk.org/guide
Contributions:258 reviews, 64 commits, 97 PRs in 2 years 9 months
openjdkjavadevelopers-guide
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