IT Administrator for a High-Security ICT System (all genders)

We are seeking an experienced IT Administrator (m/f/d) to operate a high-security information and communication system. The role includes responsibility for a secure, stable, and fully auditable IT infrastructure. Core duties involve managing isolated network zones, administering on-premise server services, and implementing advanced security requirements., IT Security & Network Architecture

• Operation and protection of an ICT system with strict separation of network domains ("red-black separation").
• Design, implementation, and monitoring of security-relevant network measures, such as firewalls, VLANs, gateways, filtering mechanisms, and data-diode-based transmission paths.
• Execution of security monitoring, log analysis, system hardening, and regular audits to ensure compliance.
• Management of user and access control concepts, including implementation of least-privilege and zero-trust principles.

Server & System Administration

• Operation and maintenance of local server environments (physical and virtual).
• Administration and monitoring of central services such as:

• NAS systems (storage, backups, snapshots, quotas)
• Internal Git and GitLab instances
• Authentication and directory services
• Internal communication and collaboration systems

• Planning and execution of updates, patches, security checks, and system optimizations.
• Automation of recurring tasks using scripting languages (e.g., Bash, Python, PowerShell).

Operations, Documentation & Support

• Ensuring smooth 24/7 operation of infrastructure components (including participation in an on-call rotation).
• Creation and maintenance of technical documentation, operating manuals, and security concepts.
• Close collaboration with security engineering, development, and management teams.
• Providing user support in a strictly regulated IT environment.

• 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
• Red-black separation concepts / domain separation
• Linux and/or Windows server administration
• Virtualization technologies (e.g., VMware, KVM, Proxmox)
• Storage systems (NAS/SAN)
• Git/GitLab operation, CI/CD services, and internal DevOps workflows

• Experience with monitoring tools (e.g., Prometheus, Grafana, ELK stack) is an advantage.
• Familiarity with security standards (BSI guidelines, hardening guides, audit requirements).

Personal Skills

• High reliability, sense of responsibility, and strong security awareness.
• Structured, documentation-focused working style.
• Strong team spirit and communication skills in interdisciplinary project teams.
• Willingness to work within complex, security-critical environments.

• A collaborative and innovative environment in Vienna, a global hub for quantum research and space technology.
• The chance to contribute to and to shape a rapidly growing company
• The opportunity to jointly develop projects and products at the thrilling junction between quantum and space technology
• Flexible work arrangements in a hybrid model combining remote and onsite collaboration
• The opportunity to make a lasting impact on the future of quantum technologies
• Balanced work-life integration for our employees
• Attractive workplace with excellent infrastructure at Wienerberg
• Great Italian espresso
• Humorous and friendly work atmosphere

The minimum gross salary for this position is € 3.499,78 per month (based on full-time employment) in accordance with the collective agreement. However, there is a willingness to offer a higher salary depending on experience and qualifications.

Quantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees!

At Quantum Technology Laboratories GmbH (qtlabs), we are at the forefront of innovation in optical and quantum-based communication technologies. Our team develops cutting-edge quantum key distribution (QKD) systems and optoelectronic solutions for space and terrestrial applications. Based in Vienna, our center of excellence drives technological advancements that secures communication around the world. Quantum Technology Laboratories GmbH is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees!