Jan Klemkow
Kernel Developer at OpenBSD
Munich, Bavaria, Germany
Summary
👤
Senior🎓
Top SchoolJan Klemkow is a kernel and Unix-focused developer with 14 years of hands-on experience optimizing network stacks and drivers, currently improving OpenBSD performance at genua in Munich. He blends a pragmatic Unix philosophy with low-level systems engineering, shipping features like checksum offloading and TCP segmentation offloading for OpenBSD's kernel. A long-time OpenBSD contributor and organizer of local hackathons, he operates at the intersection of professional contract work and community-driven open source. His background ranges from DNS/DNSSEC and static code analysis to research on one-way gateway protocols, showing a consistent focus on secure, reliable networked systems. Colleagues describe him as a quiet, methodical engineer who prefers small, durable solutions over flashy rewrites.
14 years of coding experience
5 years of employment as a software developer
Master of Engineering - MEng, Technical Computer Science, Master of Engineering - MEng, Technical Computer Science at Hochschule Wismar
Github Skills (10)
kernel10
ip10
driver10
c-programming10
kernel-mode10
openbsd10
tcp10
networking9
ipv68
ipv48
Programming languages (6)
Github contributions (5)
openbsd/src
Jan 2023 - Jan 2023
Read-only git conversion of OpenBSD's official CVS src repository. Pull requests not accepted - send diffs to the tech@ mailing list.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 commit in 1 day
Contributions summary:Jan primarily contributed to low-level systems programming tasks within the OpenBSD source code repository. Their work focused on improving network driver functionality, including implementing checksum offloading for both IPv4 and IPv6, and adding support for TCP segmentation offloading. They also addressed several bugs and performed code refactoring, demonstrating a focus on optimizing network performance and code quality within the kernel.
openbsd
younix/shmff
Mar 2016 - Oct 2019
Contributions:40 commits, 2 PRs, 31 pushes in 3 years 7 months
memoryshared-memory
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