Joel Sikström
Stockholm, Stockholm County, Sweden
Summary
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RockstarJoel Sikström is a software engineer at Oracle focused on low-latency, highly concurrent systems as a developer on the HotSpot GC team for OpenJDK. He holds an MSc in Computer and Information Engineering from Uppsala University with top grades and completed a master’s thesis exploring free-list based dynamic storage allocators to reduce intra-page fragmentation in ZGC. With practical experience teaching core programming courses and earlier media-oriented work on per-shot video encoding at SVT, he combines strong systems research instincts with production-grade engineering. Early hands-on customer-facing roles in retail honed his reliability and operational discipline, which he now applies to high-performance JVM internals.
2 years of coding experience
Github Skills (5)
openjdk10
jvm10
java10
zgc7
garbage-collector6
Programming languages (1)
Github contributions (5)
jsikstro/jdk
Jul 2024 - Jun 2026
JDK main-line development https://openjdk.org/projects/jdk
Contributions:462 pushes, 191 branches in 1 year 11 months
jsikstro/valhalla
Dec 2025 - Jun 2026
https://openjdk.org/projects/valhalla
Contributions:26 pushes, 11 branches in 6 months
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