IT Administrator (m/f/d) – Windows & Linux Security / Hardening

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 Hardening of Linux systems in accordance with recognized standards (e.g., CIS Benchmarks) 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) Knowledge of SELinux/AppArmor, SSH hardening, firewalls (nftables/iptables), and permissions and service management 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 already make provisions for later. Flexible working hours: With trust-based working hours, you are not only responsible for your working hours, but also for your work-life balance. Mobile Work: If things get a little busy in the office, you have the option to work remotely one flexible day per week to create the right balance. Stay active: With EGYM Wellpass, you get access to thousands of fitness and sports facilities — and of course, we subsidize the membership. Bike-Leasing: We support you in staying environmentally mobile and healthy. Corporate Benefits: Your opportunity for attractive offers and discounts from well-known suppliers and brands, e.g. Adidas, Apple, Expedia. Employee events: We not only want to grow together, but also celebrate our successes together. Lunch-Card: Be powerful with delicious energy, daily lunch budget is sponsored. Company Shuttle: Enjoy our convenient shuttle service that picks you up from Laim in Munich and brings you to our location, with return trips at the end of the workday. About us: Quantum Systems specialises in the development, design, and production of small Unmanned Aerial Systems (sUAS). The company’s range of electric vertical take-off and landing (eVTOL) sUAS are built to maximize range and versatility and to provide operators with a seamless user experience. By integrating cutting-edge software capabilities, like edge computing and real-time AI-powered data processing, Quantum Systems is building next-generation UAS for clients in defence, security, public sectors. Our commitment: We are an open-minded company that not only values diversity, but actively promotes it. Regardless of gender, age, ethnic origin, religion, sexual orientation or disability, we firmly believe that the diversity of our employees is an essential part of our success. At our company, every voice is heard and every perspective is valued. We believe that our differences enrich us and help us to find creative solutions and generate innovative ideas. We pride ourselves on creating an inclusive work environment where all employees can reach their full potential.