System Administrator (Linux) (m/w/d)

About THE CLOUD Networks

THE CLOUD Networks (TCN) is one of Europe’s largest providers of public, private and virtual WiFi networks and has been setting the standard for over 14 years. As a proud member of the Wifirst Group, ‘Wanting the best’ serves as the guiding principle for The Cloud – a company that now operates worldwide and instils an inspiring vision in all its employees. Together, we aim to give our best, deliver the best and be the best – in every respect: in the quality, technological standards and design of our products; in our social and societal responsibility; in how we interact with one another internally; in our collaboration with our business partners; in the support we provide to our customers; and in our business success. Today, The Cloud is used by almost 10 million people, with more than 70 million sessions per month across over 45,000 WiFi hotspots in more than 30 countries.

About the Role

We are seeking for a Linux Administrator to design, implement, and maintain our Linux-based server infrastructure. This role is ideal for a hands-on system who can work independently, drive automation and reliability improvements across our environment.

Key Responsibilities

• Install, configure, and maintain Linux servers (RHEL/CentOS, Rocky Linux, Ubuntu, Debian, or similar) in on-premises environments
• Deploy and administer virtualisation platforms including XCP-ng, Proxmox, KVM, and VMware
• Manage and maintain physical hardware in data center environments
• Monitor system performance, troubleshoot issues, and ensure high availability and uptime of critical services
• Design and implement automation using tools such as Ansible, Chef, or Bash/Python scripting
• Administer and maintain infrastructure services (Wildfly, Free-Radius, DNS, DHCP, Kea, Squid, NFS, LDAP etc.)
• Implement and enforce security best practices, including hardening, patch management, and vulnerability remediation
• Configured and managed SAN storage systems (HPE MSA, Ceph), including volume provisioning, performance tuning, and capacity planning to support production workloads.
• Manage backup and disaster recovery processes
• Set up and maintain monitoring/logging systems (CheckMK, Zabbix, GrayLog, Rsyslog, andGrafana)
• Support containerization and orchestration platforms (Docker and Kubernetes)
• Implementing Load Balancing mechanics for critical services
• Provided Level 2 and Level 3 technical support
• Document system configurations, procedures, and troubleshooting guides.

Required Qualifications:

• 3+ years of experience in administering of Linux systems in production environments
• Strong expertise in major Linux distribution family
• Familiarity with data center, server, virtualization, storage, and backup systems.
• Experience with configuration management tools
• Solid understanding of networking fundamentals (TCP/IP, DNS, Firewall, VPN)
• Experience with version control systems (Git)
• Strong troubleshooting and problem-solving skills
• Collaborate with network, development, DevOps, and security teams on infrastructure projects
• Excellent written and verbal communication skills
• Good German and/or English skills

Preferred Qualifications:

• Bachelor’s degree in Computer Science, IT, or related field (or equivalent experience)
• Relevant certifications (RHCE, RHCSA, LFCS, or equivalent)
• Experience with containerization/orchestration (Docker, Kubernetes)
• Experience with Infrastructure-as-Code (Terraform)

What We Offer:

• Competitive salary and other company benefits
• Professional development and certification reimbursement
• Collaborative and growth-oriented team culture
• Flexible/remote work options
• Flexible working hours to support work-life balance
• Good transport access with: S-Bahn, U-Banh, Tram, Bus, Highways (A94)
• Free drinks
• Company events