Senior IT Infrastructure Engineer (m/f/d) (IT-Systemadministrator/in)

Your Responsibilities

- Infrastructure Architecture & Operations: Design, implement, and maintain on-premise IT infrastructure (compute, storage, networking). Perform capacity planning and develop/execute backup and disaster recovery strategies. Maintain comprehensive infrastructure documentation.
- Physical Data Center & Cloud Infrastructure: Manage and monitor on-premise IT facilities (servers, cooling, power) and hardware. Design and provision storage and compute/GPU infrastructure for high-performance workloads (ML/AI).
- Enterprise Networking: Design and implement WAN/LAN/WiFi network topology with proper segmentation and security controls (firewalls, IDS/IPS). Configure and manage enterprise networking equipment (switches, routers, load balancers).
- System Administration & Support: Deploy and manage Linux server infrastructure. Configure and deploy employee workstations (Linux, macOS, Windows) and manage IT equipment procurement. Provide technical troubleshooting and support. Manage user accounts with SSO.
- Vendor Management: Establish and manage relationships with technology vendors, negotiate contracts, and coordinate with service providers (ISPs, colocation).

Essential Skills

- Proven track record in building or transforming infrastructure.
- Deep expertise in enterprise networking (WAN/LAN, VLANs, routing, switching, firewalls, VPNs).
- Strong hands-on experience with server hardware assembly, configuration, and maintenance.
- Expert knowledge of storage (RAID, SAN/NAS) and backup/recovery solutions.
- Experience with Linux server administration and troubleshooting.
- Solid understanding of data center operations (power, cooling, security).
- Hands-on experience provisioning and managing GPU infrastructure.
- Scripting skills (Python, Bash) for automation.
- Experience with Infrastructure-as-Code (Terraform, Ansible).
- Strong problem-solving and troubleshooting skills for complex hardware and network issues.
- Excellent documentation and communication skills.
- Self-motivated and able to work independently in a fast-paced environment.