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Josselin E.JE

Josselin E.

DevSecOps & Sysadmin Linux Engineer

€390/day
Paris, FR
3-7 years

Average response time: 2 hours

Freelancer profile translated to English.
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About Josselin

DevSecOps & Sysadmin Linux Engineer | Île-de-France
Freelance expert in Linux, Docker/Incus, Rust, AI, and Cybersecurity. 2 years of experience at the Ministry of the Interior: MCO Capitole (N3 incidents, patches, compliance), massive deployment automation, and custom LLM optimization.
Technical Stack: Containerization (Docker/LXC/Incus), CI/CD, Bash/shell, Home Assistant privacy-first.
Available immediately to secure and scale your critical infrastructures with excellence and responsiveness.
  • French

    Native or bilingual

  • English

    Conversational

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

Experience

  • Minitere de l'intérieur
    Information Security Expert
    PUBLIC SECTOR
    September 2023 - October 2024 (1 year and 1 month)
    Paris, France
    Strategic & Governance Missions
    Draft, maintain, and implement the PSSI into operational procedures, charters, and access policies.
    Conduct risk analyses (EBIOS RM) and establish treatment plans.
    Regulatory watch: GDPR, ANSSI (RGS), ISO 2700x; contribute to the SSI strategic plan.

    Technical Operational Missions
    Deploy vulnerability audit solution; manage patch management and hardening (CVSS prioritization).
    SI monitoring with the SIC team: monitoring, alert correlation, dashboards, and on-call duty.
    Supervise SIEM, EDR, IAM, PAM, DLP systems.
    Coordinate incident response, forensic investigations, lessons learned, and DR/BCP management.
    Manage network segmentation (VLAN, DMZ) and perimeter architectures.
    Deploy and administer white label stations across the national territory and overseas departments and territories; train each local team on their use.
    Administer Capitole: manage accounts, rights profiles, authorizations, and group memberships.

    Awareness & Training
    Design and conduct awareness campaigns: e-learning, phishing workshops, social engineering, crisis simulations.
    Write best practice guides, quick reference sheets, and cyber newsletters.
    Cyber onboarding for new arrivals; train business referents on Capitole.

    Project & Consulting Missions
    Security by Design for IT projects: ASA files, risk analyses, market security clauses.
    Security certifications; DevSecOps support; audit management (pentest) and remediation.
  • Ministere de l'interieur
    IT Support Technician – Systems, Networks & Infrastructure Expertise
    PUBLIC SECTOR
    October 2024 - October 2025 (1 year)
    Paris, France
    Support & Incident Resolution
    Handle tickets escalated from lower levels and conduct in-depth diagnostics.
    Analyze, isolate, and resolve complex incidents: system failures, application conflicts, network malfunctions.
    Ensure follow-up of critical incidents until full resolution, respecting SLAs.

    Systems & Networks Administration
    Manage accounts, rights, and group policies via Active Directory.
    Configure and maintain network equipment: VPN, LAN, Wi-Fi, firewall.
    Deploy and maintain servers as well as workstations.
    Configure and manage professional Android phones (MDM enrollment, profiles, security policies).

    Level 2 – Field & Proximity
    Directly assist users with hardware and software troubleshooting.
    Ensure IT asset management: inventory, renewal, equipment traceability.
    Support users in adopting tools and best IT practices.

    Automation & Scripting
    Create automation scripts to optimize recurring tasks (PowerShell, Bash, Python, Rust, NodeJS...).
    Automate deployments, updates, and configuration management.
    Contribute to the industrialization of support processes.

    N3 Expertise & Escalation
    Handle critical infrastructure and security incidents.
    Collaborate with engineering teams and vendors to resolve fundamental issues.
    Participate in infrastructure evolution projects.

    Documentation & Continuous Improvement
    Write and maintain technical procedures and knowledge bases.
    Train and support technicians on new issues.
    Contribute to the improvement of ITSM processes according to the ITIL framework.

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