Linux System Administrator (f/m/d) Defense Products
The Linux System Administrator will manage and operate large-scale defense platforms to protect infrastructure against DDoS and cyber threats. The role involves working with Linux-based systems, network routing protocols, and automation tools like Ansible and Python in a hybrid, agile environment.
- Compensation
- Not disclosed
- Location
- Revaler Straße 28-31, 10245 Berlin
- Work setup
- Hybrid
- Seniority
- Not specified
- Employment
- Not specified
- Experience
- 3+ years
- Category
- Devops
- Posted
Skills
Must have
- 3 to 5 years of platform operating experience at scale
- Expert-level proficiency in managing complex, distributed Linux environments
- Proven experience configuring Nginx as a reverse proxy or Web Application Firewall (WAF)
- Practical knowledge of BGP, Flowspec, and Anycast routing
- Passion for eliminating repetitive tasks through Ansible, Puppet, and Python
- Strong analytical skills to evaluate DDoS attacks and implement countermeasures
Nice to have
- Initial experience with Docker, Kubernetes, ClickHouse, or the ELK Stack
Full description
About IONOS
At IONOS, we don't just manage servers – we shape the digital future for more than 6.2 million customers worldwide with our solutions. As Europe's leading hosting provider and a pioneer in independent cloud solutions, we are building next-generation infrastructure – from sovereign cloud architectures and high-performance GPU clusters to integrated AI automation tools.
What drives us is digital sovereignty for Europe and real impact for small and medium-sized businesses (SMBs) as well as large enterprises. We work in agile teams, rely on transparent structures, and believe that excellence and innovation only emerge through true team spirit.
Ready for your next step? Become part of IONOS and grow with us.
Join our highly motivated team of experts dedicated to combating cybersecurity threats. As a System Administrator, you will plan and operate our cutting-edge defense platforms alongside site reliability engineers and network engineers. These platforms are crucial for protecting our hosting products and infrastructure, encompassing classic DDoS mitigation, modern Web Application Firewalls (WAF), Zero Trust strategies, and our Content Delivery Network (CDN). We foster a culture that highly values creative ideas, agile working methods, initiative, and participation.
As an Specialist in our Defense squad, you act as a vital shield against daily DDoS and sophisticated cyber attacks. You are the first line of defense, dedicated to neutralizing threats through technical mastery and proactive mitigation.
We are hiring for this role in Karlsruhe and/or Berlin. You will join a distributed, international Defense Platform Services team of approximately 8–9 experts. You will work within specialized squads for Operations, SRE, and NRE to provide comprehensive protection for the group’s infrastructure across Germany and beyond.
Tasks
The day-to-day operations of the Defense Platform Services team directly correlate to the financial stability of the United Internet Group. When our defenders succeed, the group’s digital economy remains fluid; your success is measured by the silence of a neutralized threat.
- Active Defense & DDoS Mitigation: Administer and troubleshoot scrubbing platforms and a complex, large-scale proxy infrastructure. You will engage in the "cat and mouse game" of fighting attacks in real-time—identifying, washing, and neutralizing malicious traffic to protect core cloud and fiber services.
- Architectural Density & Operational Excellence: You will manage the lifecycle of 800+ Linux-based components within a highly available infrastructure. To maintain 24/7 group-wide protection, this role requires a mandatory on-call service rotation of one week per month, ensuring immediate response to high-priority network threats.