Senior IT Systems Administrator (Infrastructure)

Quick Facts

• Role: Senior IT Systems Administrator (Infrastructure)
• Focus: Central IT infrastructure (servers, apps & databases, networking & security, storage & virtualization, backup & recovery)
• Work model: Full-time; part-time possible; up to 11 days mobile work per month after probation

Description

You will plan, administer, and continuously improve central IT infrastructure and platform services, ensuring stable operations through monitoring, performance optimization, system hardening, and security measures. You will handle second-level support, analyze and resolve complex incidents, and implement changes, migrations, rollouts, and automated deployments. The role includes on-call participation to keep critical IT systems running.

Responsibilities

• Plan, administer, and further develop central IT infrastructure, server systems, and platform services
• Provide technical responsibility across at least two areas: servers/applications/databases, networking/network security, storage/virtualization, backup/recovery
• Ensure IT operations via monitoring, performance optimization, system hardening, and security controls
• Analyze and fix complex system malfunctions and handle second-level support requests
• Plan and implement changes, migrations, rollouts, and automated deployment procedures
• Administer and optimize virtualization, container, network, and data backup environments
• Create technical documentation and coordinate with business teams; manage external IT service providers
• Participate in IT on-call duty (rufbereitschaft)

Requirements

• IT-focused degree, training as a specialist for system integration, or comparable IT education/experience
• Minimum 4 years of professional experience with complex IT infrastructures
• In-depth knowledge in at least two focus areas
• Strong knowledge of Linux server and Windows client environments
• Experience with Windows/Linux servers (Ubuntu) and automated provisioning
• Experience with virtualization (VMware, Proxmox)
• Experience with container technologies (Docker, Kubernetes) and automation
• Experience with MS SQL Server, MySQL, PostgreSQL, including backup, recovery, and performance analysis
• Secure handling of network services (VLAN, DNS, DHCP, VPN, firewalls, LDAP, RADIUS)
• Experience with infrastructure and monitoring tools (e.g., Apache, Nginx, Solr, Icinga, Graylog, Jira/Assets), GitLab, and scripting (PowerShell, SQL)
• Knowledge of information security, data protection, and change management
• Analytical mindset, initiative, responsibility, reliability, and teamwork

Benefits

• Permanent role (unbefristet), full-time with part-time options
• Salary according to TV-L Berlin, pay grade E11 (54,300–67,700 EUR), plus annual special payment
• 30 vacation days and a 38.5-hour work week
• Flexible working hours and up to 11 days of mobile work per month after probation
• KV-Card with 50 EUR monthly non-cash benefit, health promotion, company fitness rooms, secured bicycle parking, and free public parking