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Charles Le GallCL

Charles Le Gall

Cybersecurity Expert | DevSecOps | Python Expert

€500/day
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Charles

Hello!

As an expert in cybersecurity, a seasoned Python developer, and a DevSecOps specialist, I am an engineer passionate about the technical challenges businesses face.

I can assist you with cybersecurity missions (penetration testing - pentest, configuration audits, support for security hardening or post-audit/post-incident remediation, etc.) or development – DevSecOps (specific developments, cyber support for development teams, etc.).

I enjoy understanding and designing systems, identifying vulnerabilities, and implementing secure and effective solutions. For me, cybersecurity is not just technical; it's a culture that combines innovation, rigor, and responsibility.

After working as a full-time pentester at Wavestone, I founded my consulting company, CLG Presta, to offer my freelance services. I specialize in web application penetration testing.

Furthermore, I am an expert Python developer, specializing in backend development. I design and develop solutions that balance performance, security, and reliability. I place particular importance on efficient, maintainable, and secure code. I base my solutions on coherent stacks (Web server, API, database, etc.) that I implement and secure.

For me, DevSecOps is a culture rather than a job title; it's about embedding security at every stage of a project and sharing it with all teams. My background has given me a global perspective on cybersecurity while allowing me to integrate into any team, at any level of the stack.

I love learning and also teaching, whether it's on technical subjects or raising team awareness about best practices.

Contact me to move forward together on your needs and projects!
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km), Nantes (up to 50km), Rennes (up to 50km), Caen (up to 50km)

Experience

  • DANONE
    Assistant CISO France
    AGRICULTURE
    January 2026 - July 2026 (6 months)
    Rueil-Malmaison, France
    Mission supporting the CISO to handle numerous cross-functional topics. Main objectives: CMDB analysis and improvement, management of incidents reported by the CERT, implementation of TPRM. Performed numerous Business Impact Analyses. Created input for cybersecurity tool PoCs.
    Risk Analysis Incident Management Data Analysis Audit
  • Fidelilium
    Freelance Consultant
    CONSULTING AND AUDITS
    April 2025 - Today (1 year and 4 months)
    Paris, France
    Client – SCADA HMI Editor: Post-audit support for implementing recommended remediation measures. Global IS audit, identification of areas for improvement, creation of roadmaps for the identified workstreams. Carried out the Active Directory security workstream. Wrote status reports and presented them to decision-makers.
    Security Audit PenTest Web Pentest IS Architecture System Administration
  • EVERLOG
    Backend Developer
    SOFTWARE PUBLISHING
    February 2023 - October 2025 (2 years and 8 months)
    Bordeaux, France
    Development of a Salesforce CRM data retrieval robot. Analysis of network frames (authentication mechanisms, data retrieval), reproduction, and automation. Infrastructure setup (Environment, CI/CD, etc.). Analysis, parsing, and provision of data via API. Development of client wrappers for Enedis APIs. Product security lead, implementation of security mechanisms and best practices.
    Python API CI/CD Web Scraping Data Analysis

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Education

  • Computer Science Engineer
    EPITA
    2021
    Majeure SRS (Systèmes, Réseaux et Sécurité)

Skill set

Categories