Freelancer profile translated to English.
Back to original languageAbout Guillaume
Cybersecurity expert and experienced project manager with a background at a major cybersecurity player in France (Orange Cyberdefense), I am capable of auditing and scoping simple and complex missions for all types of clients (VSE/SMEs, mid-cap companies, public services, multinationals), in both national and international contexts.
My expertise, rigor, and ability to simplify complex subjects bring versatility to my profile, which can adapt to the needs of companies.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 30km)
Experience
- Orange CyberdefenseSenior Pentester - Senior Project ManagerCONSULTING AND AUDITSSeptember 2019 - Today (6 years and 9 months)Nanterre, FranceAs a technical expert and Senior Project Manager within the Paris team, I perform the following tasks based on client requests and internal needs:
- Penetration tests (application, external, Active Directory, mobile, Wi-Fi, Cloud) - approx. 190 missions
- Configuration audits (Cloud environments, Windows, Linux systems, application services)
- Lead trainer for companies (beginner and expert levels)
- Full project management (simple and complex environments, in France and internationally)
- Management of cyber audit framework contracts (management, quotes, commercial proposals, resource management)
- Internal supervision and technical referent within the team
- Oteria Cyber SchoolTrainer in Offensive CybersecurityEDUCATION AND E-LEARNINGJanuary 2026 - Today (5 months)Gennevilliers, FranceActing as an expert in offensive cybersecurity, I engage with higher education students (levels BAC+1 to BAC+5) to introduce and train them on various topics, summarized below:
- Active Directory Pentest
Through my teachings, students acquire theoretical and practical foundations to approach these subjects from an offensive perspective. - Nexa Digital SchoolTrainer in Offensive CybersecurityEDUCATION AND E-LEARNINGMarch 2024 - Today (2 years and 3 months)Paris, FranceActing as an expert in offensive cybersecurity, I engage with higher education students (levels BAC+1 to BAC+5) to introduce and train them on various topics, summarized below:
- Introduction to attack techniques
- Introduction to Bug Bounty
- Web and system penetration testing
- Active Directory and Azure Active Directory Security
- Capture The Flag
Through my teachings, students acquire theoretical and practical foundations to approach these subjects from an offensive perspective.
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Education
- Engineering degreeTroyes University of Technology (UTT)2019Diplôme d'ingénieur en "Systèmes, Réseaux & Télécommunications", avec une spécialisation en "Sécurité des Systèmes et des Communications"
- Exchange program in offensive cybersecurityTallinn University of Technology (TTU)2018Programme d'échange en cybersécurité offensive
Certifications
- OSCP - Offensive Security Certified ProfessionalOffensive Security2023
- PASSI - Information System Security Audit ProvidersCerti-Trust2025