
Guillaume Assier
DevSecOps | Security Engineer | SRE
2 recommendations
Salary / Daily rate
2 people recommend
Rennes, France
Freelance
Remote only
Skills
Languages
About me
Intro
Site Reliability Engineer with 4+ years securing and scaling critical infrastructure for France's national cybersecurity agency and cloud platforms. Expert in Kubernetes, CI/CD automation, and zero-downtime deployments across 100+ instances. I deliver robust, security-first solutions combining DevOps excellence with deep cybersecurity expertise to keep your systems resilient and compliant.
Work experience
Site Reliability Engineer & Security engineer
ANSSI - Agence nationale de la sécurité des systèmes d'information
May 2024 - Present
2 years 6 months
Rennes, France
I worked in the detection division of ANSSI. Our role was to develop SIEM tooling and collect a huge volume of logs for the division * Designing and implementing an edge-based deployment platform based on Linux and Kubernetes, meeting high security and maintainability requirements (K3s, ArgoCD, Cilium, Bootc, and Fedora) * Preparation and monitoring of a pentest by an external service provider. Pentest successful, no critical vulnerabilities found * Automating of deployment services (Ansible, GitLab-CI IaC) * Implementing DAGs for business data collection and processing (Python, Apache Airflow) * Participation in recruitment processes (Technical architecture tests)
Junior Site Reliability Engineer
Clever Cloud
Jan 2023 - May 2024
1 year 5 months
Nantes, France
I worked in the traffic team witch in charge of develop and operate a fleet of our load balancer sozu. * Performing load balancer maintenance and upgrading in realtime without downtime (Ansible, Exherbo Linux, Sozu) More than 100 instances * Automating of deployment services and testing (Ansible, IaC, Sozu) * Packaging of rust applications (Exherbo Linux) * Implementing an ETL pipeline to extract and transform access logs (Vector, VRL) * Implementing automation performance regression tests (Python, Github Actions) * Providing Level 2/3 technical assistance to customers
Security Architect Apprentice
Urssaf Caisse nationale
Aug 2020 - Jan 2023
2 years 6 months
Nantes, France
I worked in the security architect team. I conducted tests and implemented automated security testing tools on internal Java projects. * Implement a shift left approach by embedding security tests inside CI/CD pipelines * Test and implement static code and packaging analysis (OWASP Dependency-Track, OWASP Cyclone DX) * Setup secrets detection in git repositories CI (Gitlab-CI) * Setup containers security compliance tests (Trivy)
Education
IUT Dijon-Auxerre-Nevers
DUT informatique, Computing development
Grade: Graduated
Activities and societies: Computer science studies specialize in development. Java, C, C++, C#, PHP, Javascript, Typescript
ENSIBS
Engineer's degree, Cyber/Electronic Operations and Warfare
Activities and societies: Public school attached to the @université-bretagne-sud. CyberDefense program. Learn to defend an organization against cyber threats. Technical and human skills to be able to manage a cybersecurity crisis.
Licenses & certifications
Cloud Concepts 101 - Deployments Essentials Badge
Issued: Jan 2026