Freelancer profile translated to English.
Back to original languageAbout Denis
Cybersecurity consultant / Senior Pentester – +7 years of experience | Available evenings & weekends
I help companies assess their security level, detect vulnerabilities, and reduce cyber risk through penetration tests and technical and organizational security audits.
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+100 missions completedfor clients in critical sectors (banking, energy, insurance, transport, ...).
Objective: transform security flaws into concrete, prioritized, and immediately actionable steps.
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My expertise covers:
🔍Mapping of exposed assets- OSINT, reconnaissance, attack surface
💻Penetration tests- Web, Mobile, API, Web Services (OWASP Top 10)
🏴☠️Internal Pentest with Red Team, Purple Team approach- Active Directory, internal networks, backup infrastructures
🏗️Security architecture & organizational audit- cloud, on-prem, governance, CISO interviews
⚙️Configuration review & hardening- Windows, Linux, network equipment, security best practices
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Offensive, realistic, and solution-oriented approach, with clear deliverables, prioritized recommendations, and a directly applicable action plan.
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Available on staggered hours(evenings / weekends), for one-off missions or to support your internal teams.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- PWC FranceCybersecurity Manager - PentesterCONSULTING AND AUDITSMarch 2023 - Today (3 years and 3 months)**Supervision of over 100 penetration testing projects**, including mentoring and supporting a team of four junior pentesters, from execution to deliverable submission.Support to the operational security teamin managing cybersecurity incidents.**Review and improvement of server and workstation logging policies**, to optimize the SOC's detection capabilities by leveraging the MITRE ATT&CK framework.Automation of key tasksin repetitive vulnerability management and operational security, aiming for time and efficiency gains.
- WAVESTONECybersecurity AuditorCONSULTING AND AUDITSJanuary 2019 - Today (7 years and 5 months)Courbevoie, FranceAssessing client exposure on the InternetMapping of publicly accessible assets to identify sensitive information or vulnerable services that could impact information system security.Penetration testing on critical web applicationsPerforming black-box and gray-box tests to assess application security. Identifying vulnerabilities that could compromise data confidentiality, integrity, or availability."Red Team" oriented penetration testsSimulation of internal attacks aimed at replicating the behavior of a malicious employee. Objectives achieved:- Access to executives' email- Demonstration of the ability to propagate ransomware- Extraction of customer databases- Compromise of fund transfer management services- A technical debriefing with the client's SOC allowed for an evaluation of post-exploitation detection capabilities.Organizational and architectural auditsConducted based on interviews (business and technical) and documentary analysis, to assess the security maturity of information systems.
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Education
- Engineering in Information Systems, Networks, Network SecurityESIEE PARIS2018Ingénieur en Système d'Information, Réseaux, sécurité des réseaux
- University Exchange, Computer and Network SecurityUniversity of Montreal - Polytechnique Montreal2016Echange universitaire, Sécurité Informatique et des Réseaux
Certifications
- CRTO (Certified Red Team Operator)Zero-Point Security2025
- PT0-002 - CompTIA PenTest+CompTIA2024