Mathieu Deous
Senior Security Engineer - Pentest Team at Datadog
Paris, Ile-de-France
Summary
🤩
Rockstar🎓
Top SchoolMathieu Deous is a Senior Security Engineer leading pentest efforts at Datadog with 15 years of hands-on experience in offensive security, application security, and incident response. Self-taught and deeply technical, he has progressed from freelance Python development to leading EU offensive security teams and now heads the Pentest team at a major observability vendor. He contributes to notable open-source security tools—improving CVE-Search, w3af, and modernizing a popular PHP malware finder by adding Python3 compatibility and rewriting tooling in Go—demonstrating both development and DevOps fluency. Mathieu combines practical red-team skills with backend engineering, database scripting, and tooling R&D for secure hosting and automation. Based in Paris, he favors continuous learning and building reusable security tooling, and explicitly prefers to focus on current work rather than new opportunities. His profile reflects a blend of strategic leadership and hands-on craftsmanship that delivers measurable security improvements.
15 years of coding experience
15 years of employment as a software developer
Self-educated
French, English
Stackoverflow
17,761reputation
2.6mreached
100answers
8questions
unix
top-5%
redirect
top-1%
javascript
top-5%
authentication
top-5%
virtualenv
top-1%
jinja2
top-1%
Github Skills (59)
api-rest10
python10
apidoc10
api-design10
restful-api10
jinja210
php10
api10
malware10
sql10
virtualenv10
database-management10
rest-api10
cp10
cve10
Programming languages (14)
Github contributions (5)
jvoisin/php-malware-finder
Jul 2016 - Jan 2023
Detect potentially malicious PHP files
Role in this project:
Full-stack Developer & DevOps Engineer
Full-stack Developer & DevOps EngineerContributions:11 reviews, 17 commits, 16 PRs in 6 years 7 months
Contributions summary:Mathieu primarily contributed to the project by updating and maintaining the PHP malware finder's codebase and infrastructure. They enhanced the project's compatibility by making the script Python3 compatible, refactoring code, and improving its output. Furthermore, they updated the whitelists for popular CMS like Wordpress, Drupal, Symfony and PhpMyAdmin. They also rewrote the shell script in Go and made the application go-installable.
yarasecurityphpmaliciousantivirus
cve-search/cve-search
Feb 2015 - Jun 2016
cve-search - a tool to perform local searches for known vulnerabilities
Role in this project:Back-end Developer
Back-end DeveloperContributions:20 commits, 2 PRs, 6 comments in 1 year 3 months
Contributions summary:Mathieu primarily contributed to the backend logic and database interactions of the CVE-Search project. Their commits focused on improving the database update process, including fixes for subprocess handling and removing unexpected arguments in database operations. They also made changes to various database management scripts, particularly those related to updating and managing data from sources like CAPEC and CWE, by removing unnecessary code. Furthermore, the user addressed issues with the handling and display of dates within the web interface.
searchescve-scanningvulnerabilitiescve-searchcve
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