Guillaume Assier

DevSecOps | Security Engineer | SRE

2 recommendations

Salary / Daily rate

2 people recommend

Rennes, France

Freelance

Remote only

Skills

CybersecurityDevOpsKubernetesSite reliability engineeringPythonOVHcloudGitGitHubGitLab

Languages

English

Recommended by

Fabien Imbault, PhD

ANSSI - Agence nationale de la sécurité des systèmes d'information

Head of Detection Systems and Analytics

Recommended on 23 january 2026

Emmanuel Bosquet

Clever Cloud

Développeur back-end

Recommended on 17 may 2024

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.

Links

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

Certified by Clever Cloud

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