Linux system administrator

About Datacenter Luxembourg We are Datacenter Luxembourg, a Luxembourg-based provider of colocation, cloud, connectivity and cyber protection services. We believe in giving our customers secure, resilient infrastructure they can rely on, and that’s where you come in

About the role
You will join the System Administration team and take part in the daily operation of our production infrastructure. This is a hands-on role. You will work with Proxmox and Ceph and help operate a production cluster running around 1000 virtual machines that power our services. A big part of the job is keeping systems stable: monitoring, troubleshooting, upgrades, maintenance windows, and fixing issues before they become incidents. You won’t be “thrown in alone”, but you are expected to take ownership of what you touch, document what you change, and improve things over time. A 24/7 rotating on-call is part of the job.

Key responsibilities
• Help operate and maintain Proxmox production clusters.
• Help troubleshoot and maintain Ceph storage (health, capacity, recovery).
• Maintain and troubleshoot Linux virtual machines and the services running on them.
• Handle incidents and participate in the on-call rotation (24/7).
• Use SaltStack for configuration management and operational tasks.
• Support infrastructure changes, upgrades, and expansions.
• Document systems, procedures, and changes. What do we need from you?
• Solid Linux fundamentals; Linux is your daily operating system.
• Basic experience or strong interest in virtualization (Proxmox is a plus).
• Interest in storage systems; experience with Ceph is a plus.
• Comfortable working with many services and systems (not just a few servers).
• Basic scripting skills (bash, python, or similar) and an automation mindset.
• Familiar with configuration management concepts (SaltStack preferred, or similar tools).
• Able to troubleshoot methodically and communicate clearly.
• Comfortable working in production environments where uptime matters.
• Comfortable using AI coding tools (e.g., Codex) as part of daily work. What would make you stand out?
• Hands-on experience with Proxmox in production (even small clusters / labs count).
• Hands-on experience with Ceph (even small clusters / labs count).
• Experience with SaltStack (states, pillars, grains, orchestration) or similar tools.
• Understanding of monitoring/alerting and incident handling.
• Experience with networking basics (VLANs, routing, firewalls).
• Strong documentation habits and clean operational work. Why Datacenter Luxembourg? Datacenter Luxembourg offers a unique environment where engineers can truly shape technology, from architecture and automation to security and performance. Here, your ideas matter. We encourage experimentation, support personal growth, and invest in helping every team member become an expert in their craft. A new way to apply: Join Datacenter Luxembourg’s success story Join Datacenter Luxembourg and you won’t just be keeping colocation, cloud, connectivity and cyber protection services running, you’ll be connecting people, forging relationships, and making a real difference in our story. So, if you’re prepared to embark on an engaging journey and play a pivotal role in Datacenter Luxembourg’s saga, here’s an unconventional route to apply. We invite you to record a brief video with your smartphone. Share why you’re drawn to this role or pose any questions or doubts you might have. It’s about keeping the conversation open and engaging Please remember to attach your CV in PDF format too. Instead of a conventional motivational letter, we’d like you to employ an AI of your choice. This not only mirrors our technology-focused approach, but it also allows you to showcase your adaptability to new tools. It’s less about the letter, more about your interaction with AI that we’re keen on. Meet your team leader I'm Antoine Cavelier, Head of IT Infrastructure & Operations. I believe good system administration starts with curiosity and a willingness to understand how things really work. I like being close to the technology, getting hands-on with Linux systems, understanding what happens behind the scenes, and finding ways to make infrastructure more reliable, secure, and efficient. For me, running systems is not just about keeping services online. It is about understanding their architecture, anticipating problems, automating repetitive tasks, and continuously improving the way things are built and operated. Whether it is troubleshooting a production issue, designing an infrastructure improvement, writing a script, or investigating an unexpected behaviour, I enjoy getting to the root of a problem rather than just treating its symptoms. I value autonomy, technical curiosity, and a pragmatic approach to engineering. I like people who take ownership, think things through, share knowledge, and are not afraid to challenge existing solutions when there is a better way. At the same time, I believe that good infrastructure is a team effort, built on clear communication, documentation, and trust. Technology never stands still, and neither should we. I enjoy learning, experimenting with new tools and approaches, and finding the right balance between innovation and the stability that production environments demand. If you enjoy Linux, infrastructure, automation, solving complex technical problems, and having the freedom to turn ideas into real solutions, then you might feel right at home working alongside me.