Freelancer profile translated to English.
Back to original languageAbout Nicolas
🇫🇷 French Version
Your Expert
Expert inoffensive cybersecurityandpenetration testing(Pentest),GreyMoon Securityhelps you secure your information systems.
Led by Nicolas Duvoisin, our firm helps youidentify and fix your vulnerabilitiesbefore they are exploited by cybercriminals.
Our Expertise
- Security audits for **Web, Mobile, and API**.
-Internal & ExternalPenetration Testing.
- Social Engineering and Red Team exercises on demand
Scope of Intervention
Based in **Clermont-Ferrand**, I prioritize proximity with local stakeholders, but I also operate throughout France (on-site or remotely) for your critical infrastructures.
Thanks to secure methods, I also carry out your international audits remotely.
🇬🇧 English Version
Your Expert
Specializing in offensive cybersecurity and penetration testing (Pentest), GreyMoon Security supports companies in securing their information systems.
Led by Nicolas Duvoisin, our firm helps you identify and remediate your vulnerabilities before they can be exploited by cybercriminals.
Our Core Expertise
- Web, Mobile, and API Security Audits
- Internal & External Penetration Testing
- Social Engineering and Custom Red Team Exercises
Operational Scope
Based in Clermont-Ferrand (France), I prioritize working closely with local organizations, but I also operate throughout France (on-site or remotely) to secure your critical infrastructure.
Using highly secure methodologies, I also conduct remote audits for international clients.
French
Native or bilingual
English
Fluent
Can work on-site
Clermont-Ferrand (up to 50km), Lyon (up to 50km), Marseille (up to 50km), Paris (up to 50km), Montpellier (up to 50km)
Experience
- ImmunIT SARLCybersecurity Auditor - PentesterCONSULTING AND AUDITSSeptember 2025 - March 2026 (6 months)Nyon, SwitzerlandPerforming penetration tests (Web, Active Directory, External, Mobile) to help clients identify and fix vulnerabilities in their systems.
- NEVERHACKPentesterCONSULTING AND AUDITSMarch 2024 - August 2025 (1 year and 5 months)35510 Cesson-Sévigné, FrancePenetration tests, Audits, Red teaming, phishing campaigns, and other Cybersecurity consulting activities.
- DGA - Direction générale de l'armementSoftware Security EvaluatorDEFENSE AND MILITARYNovember 2022 - March 2024 (1 year and 4 months)Bruz, FranceEvaluating application security through source code analysis. Direct contact with developers to implement fixes.
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Education
- Master's degree in Security and IT TechnologiesInstitut National des Sciences Appliquées Centre Val de Loire2022Diplôme d'ingénieur, Sécurité et Technologies Informatique
- University Diploma in Technology (DUT), Computer ScienceAix-Marseille Université2019DUT, Informatique
Certifications
- Certified Active Directory Pentesting Expert (CAPE)Hack The Box2025