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Gregory L.GL

Gregory L.

Cybersecurity & AI Security Consultant — LLM Audit

€950/day
Paris, FR
15+ years

Average response time: A few days

Freelancer profile translated to English.
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About Gregory

Expert in cybersecurity and artificial intelligence, I specialize in securing LLM systems and agentic architectures — a domain where traditional security tools are no longer sufficient.
With a dual background in Mathematics and Cybersecurity, I combine formal rigor with a concrete adversarial approach: active red-teaming (Hack The Box, YesWeHack), applied research in LLM security, and institutional anchoring within the ANSSI network as a Cyber Helper.

My work focuses on the security architecture of LLM pipelines. I am developing a proprietary framework that formalizes the security invariants of language model-based systems.

I work with companies deploying AI agents or integrating LLMs into their critical processes, to map their real risks and build an adapted security posture.
  • English

    Conversational

  • French

    Native or bilingual

Can work on-site
Paris (up to 15km)

Experience

  • ActaData
    Consultant
    SOFTWARE PUBLISHING
    April 2024 - November 2024 (7 months)
    Paris, France
    I designed and delivered professional training programs for ActaData focused on data governance, compliance, and cybersecurity. In parallel, I developed an auditable security architecture for large language models (LLMs), based on security invariants and a strict separation between intent, policy, and execution, formalized in a dedicated research paper on LLM security.
    LLM Security Secure AI Architecture AI Governance AI Security Audit Cybersecurity
  • Malakoff Humanis
    Data Engineer / Lead Data Engineer
    TECH
    April 2017 - September 2024 (7 years and 5 months)
    Paris, France
    • Architecture and migration of Cloudera Data Lake to AWS (+40% performance)
    • Secure ML Pipelines: MLOps, CI/CD, Docker containerization
    • Deployment of predictive models via SageMaker with REST API
    • Optimization of processing flows (60% reduction in execution time)
  • Aday
    Data Scientist
    DIGITAL AND IT
    December 2011 - March 2017 (5 years and 3 months)
    Paris, France
    Aday — Media Aggregator
    • AI processing of video/audio streams: advertisement detection, content filtering
    • Complete BI solutions: dashboards, reporting, KPIs
    • 4th / 1,600 participants (Kaggle)

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Education

  • Master Cybersecurity
    Open Classroom / UTT
    2026
  • Master Mathematics: AI Classification
    Paris Saclay / UVSQ
    2017
    High Honors

Skill set

Categories