Linux System Administrator (w/m/d) Defense Products
Primary stack
Job description
About the Position
Linux System Administrator (w/m/d) Defense Products
Revaler Straße 28-31, 10245 Berlin
About IONOS
At IONOS, we don't just manage servers; we shape the digital future for over 6.2 million customers worldwide with our solutions. As Europe's leading hosting provider and pioneer of independent cloud solutions, we are building a next-generation infrastructure: from sovereign cloud architectures and high-performance GPU clusters to integrated AI automation tools.
What drives us: Digital decision-making freedom for Europe and real impact for small and medium-sized enterprises (SMEs) and large corporations. We work in agile teams, rely on transparent structures, and believe that excellence and innovation only arise from genuine teamwork.
Ready for your next step? Join IONOS and grow with us.
We live a culture of open structures and friendly cooperation, characterized by an unwavering team spirit. Our Defense Team operates across locations and agilely: our expert team in Berlin and Karlsruhe is constantly growing. To further strengthen this digital shield, we are looking for a person who is ready to take on responsibility and actively shape the mission of our Defense Platform Services.
In this position, you are not just a classic administrator in the background – you are the guarantor of the availability of millions of customers and form our digital protective shield. The Defense Platform Services team is responsible for the existence of the digital infrastructure of the entire group.
Your mission is "Active Defense." You operate in a high-stakes environment and manage an infrastructure of around 800 components to neutralize threats in real-time. As part of an elite unit of Site Reliability Engineers and Network Engineers, you engage in a dynamic cat-and-mouse game against highly professional attackers. Where others capitulate in the face of massive attack scenarios, you are just getting started – because your work determines the availability of the European web.
Responsibilities
Your daily work is the precise response to the permanent threat situation: You balance the high-availability operation of our scrubbing platforms with the constant evolution of our defense strategies.
- Platform Design: You administer and optimize complex, Linux-based proxy and defense infrastructures at the highest level.
- DDoS Mitigation: You actively analyze attack patterns and implement precise countermeasures before outages can occur.
- Innovation as a Weapon: You use state-of-the-art technologies such as AI for log analysis and pattern detection to stay one step ahead of attackers and implement new mitigation ideas in the team.
- Lifecycle Management: You actively shape the operational architecture in an agile DevOps environment and ensure the continuous evolution of our defense systems.
- Response Phase: You participate in the essential on-call readiness (one week per month). This is not just a duty but the phase in which you intervene directly as the primary defender to prevent massive outages.
Requirements
We are looking for a Linux expert with the "security gene" – a professional who combines deep technical knowledge with the vigilance of a defender. You understand complex platforms as fortresses that do not tolerate any weak points.
- Experience & Seniority: You have 3-5 years of solid professional experience in the platform operation of large infrastructures.
- Technical Stack: You are an expert in Linux (Debian/CentOS) and Nginx (Reverse Proxy/WAF). Ideally, you are proficient in networking concepts such as BGP, Flowspec, and Anycast and use automation tools such as Ansible, Puppet, or Python as standard tools.
- Language Proficiency: In our international environment, you communicate fluently in English; German skills are a valuable advantage.
We Offer
- Hybrid working model.
- Flexible working hours through trust-based working time.
- Subsidized canteen and various free drinks at some locations.
- Modern office spaces with very good transport connections.
- Various employee discounts for activities and products.
- Employee events such as summer and winter parties, as well as workshops.
- Numerous further training and development opportunities.
- Various health offers, such as sports and health courses.
About the Company
At IONOS, we value diversity and welcome all applications – regardless of gender, nationality, ethnic and social origin, religion, disability, age, sexual orientation and identity, physical characteristics, marital status, or any other irrelevant criterion according to applicable law.
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