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Gwendal StephanoGS

Gwendal Stephano

Cybersecurity Consultant | Pentester | DevSecOps

€420/day
10 projects
Bordeaux, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Gwendal

Cybersecurity consultant, I guide you in securing your data and that of your clients, from the study phase of your needs to the implementation of technical solutions.

With experience in bug bounty and red teaming, I offer my experience and expertise in system and network penetration testing & heavy or web application pentesting, as well as audits concerning the implementation of current security best practices in your information system (RGPD compliance, EBIOS RM, ANSSI recommendations...).

I also develop and integrate IT solutions by intervening during the study, consulting, technical realization and MCO/MCS phases.

Finally, I provide long-term support to my clients in the IT management of their infrastructure through an outsourced SOC platform in France.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Bordeaux (up to 50km), Mont-de-Marsan (up to 50km), Périgueux (up to 50km), Saintes (up to 50km), Paris (up to 50km)

Experience

  • Anonymisé
    Cybersecurity Consultant | Pentester
    MEDICAL
    June 2025 - June 2025
    Two-day pentest on a mobile application in the health and mutual insurance sector.
    Found several critical vulnerabilities (CVSS score over 9.0) and produced a complete report including PoC and remediation procedures.
  • Anonymisé
    Cybersecurity Consultant
    CONSULTING AND AUDITS
    February 2025 - February 2025
    Bordeaux, France
    Open-source intelligence investigation.
    Production of an OSINT tracker file and review of a report with the requester.
    OSINT Ethical Hacking
  • Anonymisé
    Cybersecurity Consultant
    E-COMMERCE
    December 2024 - December 2024
    Bordeaux, France
    Disinfection, reinstallation, and data restoration for two WordPress blogs infected with viruses, rendering the sites unusable.
    Cybersecurity

Reviews

5.0

Out of 7 ratings

AmirA

Amir

Consultant SAAS multi-tenant - ABT DIGITAL

Reviewed on 12/6/2025

I have been working with Gwendal for over two years on various projects. Always professional, reliable, and clear in his communication. He does the job seriously and maintains a good client relationship over time. I recommend him without hesitation.
A

Angélique

Recherches Familiales

Reviewed on 12/2/2024

Great collaboration with Gwendal. Responsive, very professional, communicative, and educational. I would gladly work with him again. Many thanks.

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Education

  • Cybersecurity Expert
    Ynov Campus Bordeaux
    2025
    Titre RNCP Niv.7 - RNCP37832 | Formation labellisée SecNumedu (ANSSI)
  • Professional Bachelor's Degree in RIMS, Networks and Telecommunications
    IUT de Saint-Malo
    2023
    Licence professionnelle RIMS, Réseaux et Télécoms | Label SecNumedu (ANSSI)

Certifications

  • TOEIC - 915/990pts
    ETS
    2023
    English

Skill set

Categories