Julien Voisin
Security Consultant at Casaba Security
France
Summary
🤩
RockstarJulien Voisin is a security consultant with 15 years of hands-on experience hardening software and fixing vulnerabilities across diverse open-source ecosystems. Based in France and currently at Casaba Security, he brings deep C and systems expertise evidenced by contributions to projects like radare2, hardened_malloc and OSS-Fuzz, where he strengthened memory safety and fuzzing coverage. Julien blends backend engineering and security work—from improving FFmpeg integration and session hardening in web apps to adding YARA-based signature scanning and refining malware detection rules. He routinely moves between low-level debugging (memory leaks, off-by-ones) and pragmatic application fixes (cookie hardening, accessibility), showing a rare full-stack security mindset. Colleagues benefit from his forensic approach to bugs and his habit of turning noisy warnings and false positives into actionable, maintainable code improvements.
14 years of coding experience
French, English, German, Sign languages
Github Skills (98)
penetration-testing10
wordpress-themes10
python10
web-application-security10
testing10
c1110
aiff10
security10
c1710
vim10
ui-theme10
malware10
audit-logging10
code-auditing10
webextension10
Programming languages (38)
Github contributions (5)
airsonic/airsonic
Mar 2019 - Aug 2021
:satellite: :cloud: :notes:Airsonic, a Free and Open Source community driven media server (fork of Subsonic and Libresonic)
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:219 commits, 311 PRs, 125 pushes in 2 years 5 months
Contributions summary:Julien primarily contributed to front-end development by removing outdated JavaScript libraries like MomentJS and pngfix, and updating MediaElement.js. They also fixed JavaScript errors and implemented UI improvements. The contributions demonstrate a focus on modernizing the codebase and improving the user experience by replacing legacy components with contemporary alternatives and ensuring UI stability.
notesaudio-streamingsatelliteairsonicdlna
OpenMW/openmw
Oct 2018 - Jan 2023
OpenMW is an open-source open-world RPG game engine that supports playing Morrowind. Main repo and issue tracker can be found here: https://gitlab.com/OpenMW/openmw/
Role in this project:Back-end Developer
Back-end DeveloperContributions:5 reviews, 237 commits, 33 comments in 4 years 3 months
Contributions summary:Julien primarily contributed to the ESM reader, fixing bugs in the ESM and BSA file parsing related to handling incorrect or missing data within the Morrowind game engine. Their work involved addressing off-by-one errors, implementing validation for BSA parsing, and resolving crash issues related to the loading of specific record types. The user also improved the codebase by adding validation and fixing warnings, demonstrating a focus on code quality.
gametrackerrpgrpg-gamec-plus-plus
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.