Jean Lejeune
CEO & Founder - Cybersecurity Contractor at ParanoiHack SàRL
Geneva Metropolitan Area Switzerland
Summary
👤
Senior🎓
Top SchoolJean Lejeune is a Geneva-based cybersecurity entrepreneur and application security specialist with nine years of hands-on experience from pentesting to building AppSec programs. As CEO and founder of ParanoiHack and co-founder of CxTuneMaster, he helps organizations embed SSDLC practices, deploy SAST/DAST, and measure security with actionable KRIs/KPIs. Previously Head of Application Security at Lombard Odier, he led governance, security champion programs, and internal secure coding initiatives for large-scale financial apps. He combines deep offensive skills (pentesting, reverse engineering, social engineering) with product-minded engineering—having built internal security tooling, ERPs and phishing platforms—and teaches system hacking and Python. Fluent in translating technical risk into practical processes, he favors early-stage AppSec integration that prevents defects rather than chasing vulnerabilities later.
10 years of coding experience
3 years of employment as a software developer
EpitechEntrepreneurship, Entrepreneurship at HEC ParisMaster of Science (MSc) - Computer security, Master of Science (MSc) - Computer security at University of Kent
English, French
Github Skills (38)
scanner10
content-delivery-network9
security-scanner9
security9
wordpress9
docker-container9
cybersecurity7
docker-compose7
security-testing7
reverse-engineering7
pypi7
irc7
privilege6
golang6
docker6
Programming languages (6)
Github contributions (5)
Nitr4x/whichCDN
Feb 2017 - May 2017
WhichCDN allows to detect if a given website is protected by a Content Delivery Network
Contributions:19 commits, 20 PRs, 16 pushes in 2 months
content-delivery-network
Nitr4x/p0wn-box
Apr 2017 - Oct 2018
Contributions:35 commits, 36 PRs, 37 pushes in 1 year 5 months
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