CareerPlan

Senior IT-Systemadministrator (m/w/d)

Köln, NORDRHEIN_WESTFALENFull-time2026-10-08

Core

Strategic development and management of a highly available, hybrid IT landscape including Windows, Linux, and cloud infrastructures.

Role type

Senior System Administrator (Hybrid Infrastructure)

Builds

Modern, hybrid IT infrastructure including Windows/Linux servers, virtual environments, Active Directory, Microsoft 365, and network systems.

Domain

IT Infrastructure / Cloud / Enterprise Systems

Required skills

Windows Server administration, Active Directory, Microsoft 365, Enterprise Virtualization (VMware, Hyper-V), Network Infrastructure (TCP/IP, Routing, Switching, VPN), IT Security, PowerShell automation, Backup & Disaster Recovery.

Preferred skills

Strategic system architecture development, Cloud transformation, Project management, External vendor management.

Technologies

Windows Server, Linux, Active Directory, Microsoft 365, VMware, Hyper-V, PowerShell, Next-Gen Firewalls, TCP/IP, Routing, Switching, VPN.

Responsibilities

Administration, monitoring, and optimization of hybrid IT infrastructure; Configuration and maintenance of Windows/Linux servers and virtual environments; Management of Active Directory, Microsoft 365, and security policies; Ensuring system availability, data security, backup, and disaster recovery; 2nd & 3rd-level support for complex incidents; Execution of IT infrastructure projects and cloud migrations; Network infrastructure management and security concept development.

Seniority

Senior, hands-on IC