Lasse Karstensen
Oslo, Norway
Summary
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Rockstar🎓
Top SchoolLasse Karstensen is an experienced IT professional with 15 years building and securing high-performance web infrastructure, steeped in Varnish Cache internals and Linux operations. As former technical lead at Varnish Software and a contributor to major projects like varnish-cache and the TLS proxy Hitch (adding TLS 1.3), he blends systems-level engineering with practical security improvements. He has strengthened open-source security tooling—improving ModSecurity’s robustness—and contributed monitoring and tooling for Munin, showing an eye for observability and maintainability. Based in Oslo with an MSc in Communication Technology from NTNU, he also brings entrepreneurial experience as a recent CEO/co‑founder and enjoys reverse engineering in spare time, reflecting a curiosity for digging into hard technical problems.
15 years of coding experience
5 years of employment as a software developer
Norwegian University of Science and Technology
Stackoverflow
2,971reputation
109kreached
55answers
0questions
caching
top-5%
Github Skills (32)
monitoring10
caching10
reverse-proxy10
waf10
python10
testing10
configuration-management10
proxy10
c1110
apache10
tls1310
c1710
modsecurity10
openssl10
nginx10
Programming languages (14)
Github contributions (5)
varnish/hitch
Nov 2016 - Mar 2018
A scalable TLS proxy by Varnish Software.
Role in this project:
Back-end & Security Engineer
Back-end & Security EngineerContributions:5 commits, 17 PRs, 124 pushes in 1 year 4 months
Contributions summary:Lasse contributed to the security-focused TLS proxy project by implementing TLS 1.3 support and adding related test cases. They modified the configuration parsing logic to include and handle TLS 1.3 protocol options. They also addressed issues related to logging and port variables, improving the overall code quality and developer experience.
scalablesslproxytlstls-proxy
munin-monitoring/contrib
Jan 2012 - Sep 2012
Contributed stuff for munin (plugins, tools, etc...)
Role in this project:Backend Developer
Backend DeveloperContributions:19 commits in 8 months
Contributions summary:Lasse primarily contributed to the `munin-node-from-hell` tool within the `contrib` repository. Their work included adding initial functionality and configuration options, such as controlling response times and plugin behavior. They also fixed typos and integrated updates, demonstrating a focus on improving the functionality and maintainability of the tool for monitoring purposes. Furthermore, they removed outdated Varnish plugins, indicating knowledge of the Munin ecosystem.
muninmunin-pluginspluginsplugin
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