Are you passionate about managing infrastructure at a scale that few in Europe can offer? At

IONOS , Europe’s #1 hosting provider, we are looking for a

Specialist System Administrator with a leadership profile to join our critical infrastructure team. This is not a routine maintenance position. You will join at a pivotal moment to work with the technical operations of

Stretch

(our next-generation web hosting platform) and ensure the operational continuity of an ecosystem encompassing over 500 servers across 28 data centers. The Challenge: Your Mission

Your primary objective will be to stabilize and grow the infrastructure following the migration of major platforms (such as Telekom) into the IONOS ecosystem. You will be a key player in mitigating operational risks and ensuring hosting services continue to run seamlessly while we rebuild and expand the team in Spain. Key Responsibilities:

Platform Management

Build, maintain, and optimize large-scale Linux platforms and

Ceph storage clusters. Continuity & Support:

Provide Level 3 support, working closely with Level 2 teams and participating in on-call rotations (approx. 1 week every 6) after an initial adaptation period. Knowledge Transfer:

Collaborate with colleagues in Cologne (Germany) to absorb institutional knowledge of legacy systems and document critical processes. Continuous Improvement:

Identify performance bottlenecks and propose/implement proactive improvements to the existing architecture. Your Profile

We are looking for 3 passionates about

Open Source ,



who remain calm under pressure and enjoy solving complex technical puzzles. Experience:

Minimum of 3 years in Linux systems administration, with at least 1-2 years in team leadership or technical management roles. Automation & Configuration:

Strong command of configuration management tools ( Puppet, Saltstack ) and orchestration tools ( Ansible, Terraform ). Scripting:

Advanced proficiency in

BASH and Python . Cloud & Virtualization:

Hands-on experience with

OpenStack . Observability:

Proficiency with monitoring tools such as

Prometheus and Grafana . Desired Requirements

Networking knowledge (TCP/IP v4/v6, load balancing with HAProxy, routing). Experience with SQL databases (MySQL, PostgreSQL). Familiarity with containers ( Docker, Podman, Kubernetes ) and CI/CD pipelines. Experience with

ZFS file systems. General Scale:

You will work on one of the largest and most advanced hosting platforms in Europe. The volume of data and traffic you will handle is rarely found in other companies. Real Impact:

Your work will directly impact the stability of thousands of web services and the success of critical corporate-level migrations. Learning Culture:

We value curiosity. You will have access to continuous training, tech talks, and an environment that fosters professional growth. Stability and Future:

You will be part of a long-term growth strategy in Spain, enjoying the benefits of belonging to a solid, industry-leading group. Are you ready for the challenge? Apply now and help shape the technical future of IONOS.

📌 Specialist System Administrator Lead Administrator: Linux, Storage & Automation. (Madrid)
🏢 Ionos
📍 Madrid