System Administrator (Linux)

Instaffo GmbH
Heidelberg, Germany
1 day ago
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Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Experience level
Experienced
Experience required
3 years minimum
Compensation
€51,000.0 - €63,000.0
Working hours
Regular working hours
Languages
English, German
Job source

Tech stack

Proxmox Bash Shell Ubuntu (Operating System) CentOS Data Centers Dynamic Host Configuration Protocol Debian Linux Linux DevOps Document Management Systems Domain Name System (DNS) Monitoring of Systems
+30 more
Virtual Private Networks (VPN) WildFly (JBoss AS) Kernel-Based Virtual Machine Lightweight Directory Access Protocols (LDAP) Linux Distribution Linux Servers Networking Basics Network File Systems Performance Tuning Red Hat Enterprise Linux Ansible Squid (Proxy Server) TCP/IP Virtualization Technology Software Vulnerability Management Backup and Restore Zabbix Ceph (Software) Scripting Load Balancing CheckMK System Availability Firewalls (Computer Science) Git Containerization Infrastructure Automation Frameworks Patch Management Software Version Control Docker Vmware

Job description

  • 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., You will collaborate with our network, development, DevOps, and security teams on various infrastructure projects within a collaborative and growth-oriented culture.

Requirements

Please note that this position requires work authorization for Germany. The language requirements for this position are: German - Fluent (C1), English - Fluent (C1). The estimated salary range from XING does not necessarily correspond to the salary range of this job offer.

We are seeking a Linux Administrator to design, implement, and maintain our Linux-based server infrastructure. This role is ideal for a hands-on professional who can work independently to drive automation and reliability improvements across our environment., * 3+ years of experience in administering Linux systems in production environments

  • Strong expertise in major Linux distribution families
  • Familiarity with data center, server, virtualization, storage, and backup systems
  • Solid understanding of networking fundamentals (TCP/IP, DNS, Firewall, VPN)
  • Experience with configuration management tools and version control systems (Git)

About the company

Wifirst ist ein führendes europäisches Telekommunikationsunternehmen, das seit 2002

Pionierarbeit im Bereich Business-WLAN-Lösungen leistet. Als mittelständischer, widerstandsfähiger Telekommunikationskonzern bietet Wifirst intelligente Konnektivitätslösungen, die auf die Bedürfnisse von Unternehmen zugeschnitten sind und sich auf Kostenoptimierung, Leistungsverbesserung, verbesserte Kundenerfahrung sowie verstärkte CSR-Verpflichtungen konzentrieren. Das Unternehmen verwaltet eine beeindruckende Infrastruktur von über 350.000 WLAN-Zugangspunkten, die rund um die Uhr überwacht werden und zum Beispiel mehr als 1 Million Zimmer in Hotels, Studentenwohnheimen und Touristenunterkünften verbinden. Monatlich verbinden sich über 4 Millionen Geräte mit dem Netzwerk und 15.000 Einzelhandelsverkaufsstellen mit einer Fläche von mehr als 25 Millionen Quadratmetern. Mit über 350 engagierten Mitarbeitenden hat sich Wifirst als wichtiger Akteur im Bereich der Konnektivität etabliert.

Mit zwei Unternehmensakquisitonen in den Jahren 2024 (HOTSPLOTS) und 2025 (The Cloud Networks) ist Wifirst auch in den deutschen Markt eingetreten und hat sich neue Perspektiven für eine schnelle europaweite Expansion eröffnet., Instaffo GmbH

Internet and IT

51-200 employees

Heidelberg, Germany

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