Jan De Mooij
Principal Engineer at Mozilla Corporation
Veenendaal, Utrecht, Netherlands
Summary
👤
Senior🎓
Top SchoolJan De Mooij is a Principal Engineer with 17 years of experience, currently leading development on SpiderMonkey, Mozilla’s JavaScript engine, and serving as JIT module owner since 2013 and SpiderMonkey module owner since 2021. He focuses on performance, compilers, virtual machines, browsers, and security, bringing deep C++ expertise alongside Python, Java, and tooling experience with Mercurial. Based in the Netherlands, he combines hands-on optimization and profiling work with module stewardship across Gecko, regularly navigating low-level tradeoffs that shape real-world browser behavior. His background includes an MSc in Software Engineering from the University of Amsterdam and a long-standing commitment to shipping reliable, high-performance VM components.
17 years of coding experience
5 years of employment as a software developer
Bachelor, Computer Science, Bachelor, Computer Science at Utrecht UniversityMSc, Software Engineering, MSc, Software Engineering at University of Amsterdam
Github Skills (106)
mojolicious10
perl10
spidermonkey10
git-clone10
replay10
linux10
gdb10
inbound10
bit10
mozilla10
editor9
browser9
firefox9
vulnerabilities9
forking9
Programming languages (11)
Github contributions (5)
jandem/website
Oct 2015 - Apr 2024
Contributions:46 pushes, 1 branch in 8 years 8 months
jandem/jandem.github.io
Mar 2019 - May 2022
Contributions:15 pushes, 1 branch in 3 years 2 months
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