Linux System Administrator (Luxembourg)

CTG IT Solutions is currently looking for a Linux System Administrator within the European Institutions in Luxembourg.

Your RESPONSABILITIES:

Operational Support & Troubleshooting

• Provide Level 2–3 support for Linux OS configuration, file systems, processes, log analysis, and system troubleshooting.
• Diagnose and resolve issues related to hosted applications, platforms, reverse proxies, and server environments (Intranet/Internet).
• Ensure proper execution of backup, storage, and security-related operational tasks.

System Administration & Infrastructure Management

• Manage provisioning of Linux servers and VMs.
• Maintain a reliable, standardized, and compliant operating environment.
• Perform patch management, OS lifecycle operations, and migration activities.
• Administer and support the OpenShift container platform.
• Use GitLab for version control and CI/CD pipeline integration.
• Participate in high availability (HA) and disaster recovery (DR) design and implementation.
• Administer and support Red Hat Satellite and manage Satellite-based environments.
• Administer and support Reverse Proxy platforms for on-premises and Cloud (AWS).

Automation scripting

• Develop and maintain automation using Red Hat Ansible Platform to improve reliability, repeatability, and operational efficiency.
• Contribute to service design with a focus on automation and “shift-left” practices.

Documentation & Process

• Maintain accurate and up-to-date technical documentation and operational procedures.
• Ensure compliance with ITIL processes (incident, change, problem management).
• Perform activity reporting and manage operational priorities.
• Organize knowledge-sharing workshops within the team.
• ServiceNow for ticketing and workflow management.

Linux Platforms & Services

• Proxies (Squid), reverse proxies (Nginx), and nftables firewalls configuration.
• Manage SSL/TLS certificates and Linux security configurations.
• Java- and Spring Boot–based webservers and Artemis MQ.
• Handle client/agent support such as metricbeat, filebeats, and NetBackup.

Datacenters infrastructure and Cloud

• Support authentication systems including SAML/OIDC, ADFS, and Azure Entra ID.
• Networking IPv4, Virtualization (Nutanix), databases (Oracle, PostgreSQL), and storage (SAN, NAS, S3).
• Containerisation: Kubernetes, Docker, and Podman.

Your Profile:

Education & Certifications

• Minimum 3 years of proven hands-on experience managing Unix/Linux systems, ideally within a large-scale or critical production environment.
• Bachelor's degree in Computer Science, Information Technology, or equivalent experience.
• Relevant certifications (RHCSA, RHCE, Kubernetes, Ansible, ITIL, etc.) are a plus.
• Very good knowledge of English and French.

Key Competencies

• Strong expertise with Red Hat Enterprise Linux (RHEL) 8/9.
• Experience with Java/Nginx application servers.

Additional knowledge:

• Nutanix virtualization.
• Oracle, PostgreSQL.
• Kubernetes / OpenShift / Docker / Podman.
• Nginx reverse proxy.
• GitLab and CI/CD pipelines.
• PAM/SAM solutions.
• Backup & storage solutions (SAN, NAS, S3).
• Advanced network knowledge (IPv4, DNS, Firewall, Routing, DMZ).
• Java/Springboot hosting architectures.
• Messaging systems such as Artemis MQ.

Our Offer:

• An attractive salary package with or without a company car
• 5 additional vacation days each year
• A dedicated training program with personal development plans
• Extra-legal advantages (IT material, banks, ...)
• Regular events with the CTG team : learning lunchs, team buildings, fun events, Xmas, Marathons, ...

If you like multicultural teams and want to join a company with open communication, then apply right now !

Please note that a criminal record will be asked for this position.