IT System Administrator Windows (m/f/d)

At Quantum Systems, we are redefining the future of unmanned systems with intelligent, autonomous solutions that enable better decisions in critical environments. Our mission is to combine cutting-edge technology, AI, and robust engineering to create next-generation intelligence solutions. As part of our IT team, you will play a key role in ensuring the security, stability, and resilience of our global IT infrastructure. What is your Day to Day Mission: Hardening and secure operation of Windows 11 endpoints (security baselines, GPOs, security policies), including endpoints used as Ground Control Stations Administration and rollout of Rohde & Schwarz Trusted Disk (BSI-approved full-disk encryption for VS-NfD classified information) Implementation and compliance with requirements governing the handling of information classified as VS-NfD Operation and maintenance of Symantec Endpoint Security (Broadcom): policies, updates, and incident handling Vulnerability management, patch management, and compliance assessments Documentation of hardening measures and contribution to security concepts What you bring to the team: Strong hands-on experience in Windows 11 administration and hardening (security baselines, BitLocker/alternatives, Credential Guard) Experience with Rohde & Schwarz Trusted Disk or comparable encryption solutions Experience with Symantec Endpoint Security or comparable EDR/AV products Knowledge of ACLs, GPOs, Intel TET, and PowerShell Experience hardening common distributions (Debian/Ubuntu, RHEL/SUSE) Experience working with CIS Benchmarks and/or BSI requirements; ideally with automation using Ansible and Bash scripting Good knowledge of networking concepts (TCP/IP, DNS, VLANs, firewalling) Proficiency in using Wireshark for network traffic analysis and troubleshooting Knowledge of the requirements for handling information classified as VS-NfD (ideally experience working in environments with corresponding security classifications; willingness to undergo a security clearance procedure in accordance with the German Security Clearance Act (SÜG)) Understanding of vulnerability and patch management processes Structured, documentation-oriented approach to work; proficiency in written and spoken German and English Strong communication skills, particularly when working with software developers Certifications such as CompTIA Security+, LPIC, or Microsoft SC-/MD-series certifications Experience working in regulated environments (BSI, ISO 27001) Why Quantum-Systems: We believe in the power of combined efforts: straightforward tech expertise paired with a customer-centric focus. We are industry pioneers who are ambitious, bold, and visionary. We push limits, think outside-the-box and strive for technological excellence to shape the future of aerial data. We promise to be your runway for individual and professional growth. Our benefits: Company pension scheme: We support you so that you can…