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Denis PetitDP

Denis Petit

Cybersecurity Director | ISO 27001 / 42001 Audits

€800/day
Paris, FR
8-15 years

Average response time: A few days

Freelancer profile translated to English.
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About Denis

Experienced in building cybersecurity services for companies, I advise and implement solutions tailored to your needs, industry, and budget.

I conduct internal audits for the creation of a roadmap for implementing technical or organizational measures, for obtaining ISO or SOC 2 certifications, or simply to understand the security risks in your business.
  • French

    Native or bilingual

  • English

    Native or bilingual

Can work on-site
Paris (up to 50km)

Experience

  • Algolia
    Chief Security Officer
    TECH
    January 2019 - December 2025 (6 years and 11 months)
    Paris, France
    Context: SaaS, scale-up, high growth, international

    Strategy, Governance, and Risk

    • Definition and execution of a comprehensive cybersecurity strategy aligned with business objectives, risk appetite, and regulatory requirements.
    • Establishment and management of a complete security governance framework (policies, standards, decision-making principles, risk acceptance workflows).
    • Management of the company's cyber risk management program: risk register, assessments, mitigation strategies.
    • Definition and monitoring of key indicators (KPI/KRI) and decision-making reporting on risk posture, program progress, and investment needs.

    Security Engineering and Operations

    • Technical reference for architecture and engineering: integration of Security-by-Design and Privacy-by-Design in the SDLC, identity management, and data protection.
    • Supervision of the operational ecosystem, including incident response and crisis management.
    • Integration of security into projects, change management, and engineering workflows.

    Compliance and Audit

    • Leadership of compliance programs (ISO 27001, SOC 2 Type II, BSI C5), including design, certification audits, and continuous monitoring.
    • Translation of regulatory requirements and frameworks into measurable controls.
    • Coordination of security testing and remediation tracking.
    • Maintenance of security documentation and compliance records.

    Leadership, Business Enablement, and Culture

    • Creation, development, and leadership of an international security team, including recruitment, mentoring, and organizational sizing.
    • Cross-functional collaboration to align security with product and business objectives.
    • Development of internal awareness and training programs.
    • Communication: translating security challenges into strategic narratives for management.
    ISO 27001 Team Management SOC2 Cybersecurity Governance Cybersecurity Strategy
  • Groupe Ymagis
    Information Security Manager
    FILM AND AV
    August 2013 - January 2019 (5 years and 5 months)
    Paris, France
    Context: Industry in transition, hyper-growth, international, media industry
    • Role with a strong operational component, combining technical expertise and strategic management of security issues.
    • Management of compliance measures related to media protection, including conducting security audits according to MPAA standards for distribution to major studios (before TPN structuring).
    • Support for the digital transformation of the sector, with responsibility for the Security domain during the shift from a film-based industry to digital infrastructures.
    • Design and security of complex network architectures covering heterogeneous environments (post-production, offices, VR immersive experiences), including the implementation of control and segmentation mechanisms (proxy).
    • Definition and deployment of physical security strategies adapted to sensitive and high-value data centers and sites (laboratories, storage, immersive installations).
    • Integration of regulatory requirements for personal data protection (GDPR), from impact analysis to their implementation in internal and client services.
    • Management of the IT department and its resources during growth from 20 to 100 employees.
    Transition Management Cybersecurity Governance IT Governance Cybersecurity Strategy Cybersecurity Project Management
  • YMAGIS
    Systems and Network Engineer
    FILM AND AV
    January 2009 - January 2013 (4 years)
    Paris, France
    Context: Industry in transition, hyper-growth, international, media industry
    • Development, creation, deployment, and support of a client infrastructure for the deployment of digital cinema across Western Europe (1000 servers).
    • Project management for the deployment of this infrastructure for the MK2 and UGC groups (60 sites).
    • Management of the IT department and its resources during growth from 20 to 100 employees.

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Education

  • University Diploma in Technology in Computer Science and Computer Engineering
    IUT Orsay – University Paris XI
    1995
    D.U.T. Informatique et Génie Informatique

Certifications

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