Julien Desfossez
Staff Software Engineer at NorthSec
Montreal, Quebec, Canada
Summary
👤
Senior🎓
Top SchoolJulien Desfossez is a Staff Software Engineer with 15 years of deep expertise in kernel and system performance, currently building GPU cloud control-plane software at LambdaLabs. He previously led kernel and performance engineering at DigitalOcean, driving KVM/hypervisor optimizations, core-scheduling kernel patch contributions, fleet-wide performance analysis, and authoring the open-source vmtop tool. Julien’s background spans Linux kernel and user-space tracing (LTTng, perf, ftrace, systemtap), eBPF-based diagnostics, and automated hardware/software testing frameworks, blending research-grade rigor with production-scale delivery. He also volunteers as Co-VP of Infrastructure for NorthSec, where he designs and operates large-scale CTF networks and occasionally authors kernel/BPF challenges. Based in Montreal with graduate-level training in computer engineering and ongoing PhD work, he combines low-level systems mastery with practical cloud infrastructure leadership.
15 years of coding experience
12 years of employment as a software developer
Ph. D., Computing, Ph. D., Computing at École Polytechnique de MontréalBachelor of Science (BSc), Computer Science, Bachelor of Science (BSc), Computer Science at Université de SherbrookeDUT, Génie des télécommunications et des réseaux, DUT, Génie des télécommunications et des réseaux at Université d'Artois
Stackoverflow
11reputation
365reached
2answers
0questions
Github Skills (95)
kvm10
ipmi10
stress-testing10
vms10
network-tools10
qemu10
reusability10
libvirt10
benchmarking10
vdi10
esxi10
monitoring9
vultr9
digitalocean9
rapid9
Programming languages (6)
Github contributions (5)
jdesfossez/lttng-modules-dev
Mar 2015 - Oct 2018
Contributions:60 pushes, 7 branches in 3 years 7 months
jdesfossez/lttng-tools-dev
Apr 2015 - Jan 2018
Contributions:237 pushes, 14 branches, 4 comments in 2 years 9 months
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