About

Technical Expertise & Experience

Nicolas Duvoisin

Nicolas Duvoisin

Gr3yM00n
Founder & Pentester

After several years of intensive experience in penetration testing within specialized consulting firms, I chose to go independent in order to practice my profession with greater freedom and impact. As a computer engineer specialized in cybersecurity, driven by a strong technical passion and holding recognized certifications, I am fully committed to raising my clients' security posture against today's threats.

Choosing a freelance expert means opting for efficiency, proximity, and cost control. Without heavy structures or intermediaries, you pay directly for technical expertise rather than overhead costs. I act as your single point of contact, from needs assessment to final report delivery, ensuring optimal responsiveness, tailored follow-up, and services that are often more competitive than those of a traditional consultancy.

Background & Activities

Pentester

3+ years of experience in offensive cybersecurity.

Bug Bounty

Bug hunting and vulnerability reporting on public and private programs.

Missions

Over a hundred penetration tests performed.

CTF Player

Regular participation in Capture The Flag competitions.

Ready to secure your infrastructure?

Don't wait for an incident to act. Let's discuss your needs and define the scope of your audit together.