Operate and secure an ICT system with strict separation of network domains ("red-black separation").
Design, implement, and monitor security-relevant network controls such as firewalls, VLANs, gateways, filtering mechanisms, and data-diode-based transmission paths.
Perform security monitoring, log analysis, system hardening, and regular audits to ensure compliance.
Manage user and access control concepts, implementing least-privilege and zero-trust principles.
Operate and maintain local server environments (physical and virtual).
Administer and monitor central services such as: NAS systems (storage, backups, snapshots, quotas), internal Git and GitLab instances, authentication and directory services, and internal communication and collaboration systems.
Plan and execute updates, patches, security checks, and system optimizations.
Automate recurring tasks using scripting languages (e.g., Bash, Python, PowerShell).
Ensure reliable 24/7 operation of infrastructure components (including participation in an on-call rotation).
Create and maintain technical documentation, runbooks, and security concepts.
Provide user support in a strictly regulated IT environment.

Requirements

Completed degree or relevant IT training (e.g., computer science, IT security, system administration) or equivalent professional experience.
Several years of experience administering security-critical IT systems.
In-depth knowledge of network segmentation and secure network architectures.
Experience with red-black separation concepts / domain separation.
Linux and/or Windows server administration.
Virtualization technologies (e.g., VMware, KVM, Proxmox).
Storage systems (NAS/SAN).
Operation of Git/GitLab, CI/CD services, and internal DevOps workflows.
Experience with monitoring tools (e.g., Prometheus, Grafana, ELK stack) is an advantage.
Familiarity with security standards (e.g., BSI guidelines), hardening guides, and audit requirements.

Benefits

Flexible working arrangements in a hybrid model combining remote and on-site collaboration.
The opportunity to make a lasting impact on the future of quantum technologies.
Collaborative and innovative working environment in Vienna.
Balanced work-life integration for our employees.
Attractive workplace with excellent infrastructure.

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

network segmentationsecurity monitoringlog analysissystem hardeninguser and access controlscripting (Bash, Python, PowerShell)Linux server administrationWindows server administrationvirtualization technologiesstorage systems (NAS/SAN)

Soft Skills

user supporttechnical documentationcollaboration