Freelancer profile translated to English.
Back to original languageAbout Guillaume
Cyberdefense engineer by training, I now offer my skills in design, build, and run.
After several years of experience within a French Cloud Provider and then at ANSSI, I design and implement robust, secure, and resilient systems. I work on resilience, security, and scalability challenges.
A key point for me is to focus as much on human relationships as on technical skills to achieve the set objective.
Feel free to contact me to discuss your project 📧
French
Native or bilingual
English
Fluent
Can work on-site
Rennes (up to 30km), Vannes (up to 30km)
Experience
- ANSSISecurity Engineer | SRE (Site Reliability Engineer)TECHMay 2024 - April 2026 (1 year and 11 months)Rennes, FranceI worked within the ANSSI Detection division. Our role was to develop SIEM tools and collect a large volume of logs for the division.
- Design and implementation of a Linux and Kubernetes-based edge deployment platform, meeting high security and maintainability requirements (K3s, ArgoCD, Cilium, Bootc, and Fedora)
- Preparation and follow-up of an intrusion test by an external provider. Penetration test successful, no critical vulnerabilities detected
- Automation of deployment services (Ansible, GitLab-CI IaC)
- Implementation of DAGs for collecting and processing business data (Python, Apache Airflow)
- Participation in recruitment processes (technical architecture tests)
- Clever CloudJunior SRE (Site Reliability Engineer)TECHJanuary 2023 - May 2024 (1 year and 4 months)Nantes, FranceI worked within the traffic team, responsible for the development and operation of a fleet of our Sozu load balancer.
- Maintenance and real-time upgrade of the load balancer without service interruption (Ansible, Exherbo Linux, Sozu), over 100 instances
- Automation of deployment and testing services (Ansible, IaC, Sozu)
- Packaging of Rust applications (Exherbo Linux)
- Implementation of an ETL pipeline to extract and transform access logs (Vector, VRL)
- Implementation of automation performance regression tests (Python, Github Actions)
- Providing level 2/3 technical support to clients
- Urssaf Caisse NationaleCybersecurity Architect ApprenticePUBLIC SECTORAugust 2020 - January 2023 (2 years and 5 months)Nantes, FranceI worked within the security architects team. I performed tests and implemented automated security testing tools on internal Java projects.
- Implementation of a "shift left" approach by integrating security tests into CI/CD pipelines
- Testing and implementation of static code analysis and packaging (OWASP Dependency-Track, OWASP Cyclone DX)
- Configuration of secret detection in CI git repositories (Gitlab-CI)
- Configuration of container security compliance tests (Trivy)
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Education
- Cyberdefense EngineerENSIBS2023
- DUT in Computer ScienceIUT2020
Certifications
- Cloud Concepts 101 - Deployments EssentialsClever Cloud2025