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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Ingénieur Système LINUX/ Sécurité - **Company:** NUMEN SERVICES - **Location:** Chambray-lès-Tours, France (Remote available) - **Experience:** Experienced - **Salary:** €47,000.0 - €48,500.0 - **Contract:** Permanent contract - **Skills:** Proxmox, Apache HTTP Server, Ubuntu (Operating System), Databases, Continuous Integration, Debian Linux, Linux, HAProxy, Web Servers, Virtual Private Networks (VPN), Kernel-Based Virtual Machine, PostgreSQL, Linux System Administration, OpenStack, Public Key Infrastructure, Red Hat Enterprise Linux, Ansible, Prometheus, Information Technology Security Auditing, Virtual Router Redundancy Protocols, Openstack Neutron, Saltstack, Grafana, Containerization, Selinux, Cinder (Software), Docker - **Published:** July 22, 2026 - **Apply:** https://fr.indeed.com/viewjob?jk=35b68784e077f3dc ## About the Role Formation & expérience * Bac+4 / Bac+5 en informatique, systèmes & réseaux ou équivalent * 3 à 5 ans d'expérience minimum sur un poste d'ingénieur système Linux en production * Expérience avérée en administration Linux (Debian/Ubuntu et/ou RHEL/Rocky Linux) * Pratique concrète de l'automatisation (SaltStack, Ansible ou équivalent) * Expérience en environnements virtualisés Proxmox / KVM et/ou cloud privé OpenStack ## Description Virtualisation & Cloud privé * Concevoir et maintenir les clusters Proxmox VE en haute disponibilité * Gérer le stockage distribué CEPH (RBD, CephFS, réplication, snapshots) * Déployer et opérer les composants OpenStack (Nova, Neutron, Cinder, Keystone, Glance) * Dimensionner la capacité et garantir les SLA de disponibilité Automatisation & Infrastructure as Code * Développer et maintenir les formules SaltStack (states, pillars, grains, reactor, orchestration) * Automatiser le déploiement et la configuration des serveurs, services et middlewares * Contribuer à la mise en place d'un pipeline CI/CD pour la gestion de l'infrastructure Conteneurisation & services exposés * Déployer et opérer des workloads Docker et Docker Compose en production * Administrer les serveurs web Apache (vhosts, modules, TLS) * Configurer et maintenir HAProxy et les Load Balancers (keepalived / VRRP) Supervision & observabilité * Déployer et piloter la stack Prometheus / Grafana (exporters, alertmanager, dashboards) * Définir les indicateurs clés et les seuils d'alerte opérationnels * Analyser les métriques de performance et anticiper les incidents Base de données PostgreSQL * Administrer les instances PostgreSQL (installation, tuning, haute disponibilité, réplication) * Assurer les sauvegardes, les restaurations et la conformité des accès Sécurité des systèmes * Appliquer les politiques de durcissement OS Linux (CIS Benchmarks, SELinux / AppArmor) * Gérer les règles firewall, VPN et PKI interne * Conduire des audits de sécurité réguliers et participer aux incidents (détection, remédiation) * Contribuer à la mise en conformité NIS2 / ISO 27001 ## Related Videos - [Docker network without Docker](https://www.wearedevelopers.com/videos/1418-docker-network-without-docker) - [Bringing digital education to refugee and host communities in remote regions of Africa](https://www.wearedevelopers.com/videos/644-bringing-digital-education-to-refugee-and-host-communities-in-remote-regions-of-africa) - [Enhancing Workload Security in Kubernetes](https://www.wearedevelopers.com/videos/356-enhancing-workload-security-in-kubernetes) - [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered) - [Docker exec without Docker](https://www.wearedevelopers.com/videos/1094-docker-exec-without-docker) - [Docker build without Docker](https://www.wearedevelopers.com/videos/100114-docker-build-without-docker) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers) - [Average Salary in France](https://www.wearedevelopers.com/magazine/269-average-salary-in-france) - [Best Companies to Work For in Paris: Top 25 Companies in 2023 ](https://www.wearedevelopers.com/magazine/190-best-companies-to-work-for-in-paris-top-25-companies-in-2023) - [Best Companies to Work For in France: Top 25 Companies in 2023 ](https://www.wearedevelopers.com/magazine/189-best-companies-to-work-for-in-france-top-25-companies-in-2023)