Bei IONOS arbeitest Du bei dem führenden europäischen Anbieter von Cloud-Infrastruktur, Cloud-Services und Hosting-Dienstleistungen partnerschaftlich mit unterschiedlichen Teams zusammen. Uns zeichnen offene Arbeitsstrukturen, Duz-Kultur und flache Hierarchien mit unvergleichlichem Team-Spirit aus. 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). You will join a distributed, international Defense Platform Services team of approximately 8–9 experts. The day-to-day operations of the Defense Platform Services team directly correlate to the financial stability of the United Internet Group. 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. Innovation & Data-Driven Defense: You will evaluate and integrate new technologies—including Docker and Kubernetes—to ensure our defense architecture remains lean, efficient, and ahead of evolving industry threats.

We are looking for an administrator with a "security gene"—a specialized, proactive interest in DDoS mitigation and cyber defense that goes beyond standard system maintenance.

Expert-level proficiency in managing complex, distributed Linux environments.

Proven experience configuring Nginx as a reverse proxy or Web Application Firewall (WAF).

A passion for eliminating repetitive tasks through Ansible, Puppet, and Python.

Several years of experience in the administration of complex, distributed Linux systems.

Proven experience in configuring and operating Nginx as a reverse proxy or web application firewall.

Hands-on experience with the deployment of BGP, Flowspec, and Anycast routing on Linux systems and network routers.

Strong passion for automation using tools like Ansible, Puppet, and Python to eliminate repetitive manual tasks.

Like us, you are a strong advocate for Open Source, especially Linux.

Benefits

Hybrid working model.

Subsidized canteen and various free drinks at select locations.

Modern office space with excellent public transport connections.

Various employee discounts for activities and products.

Employee events such as summer and winter parties, as well as workshops.

Numerous training and development opportunities.

IONOS hat mehr als sechs Millionen Kundinnen und Kunden und ist mit einer weltweit verfügbaren Plattform in 18 Märkten in Europa und Nordamerika aktiv. Mit seinen Web Presence & Productivity-Angeboten agiert das Unternehmen als “One-Stop-Shop" für alle Digitalisierungs-Bedürfnisse - von Domains und Webhosting über klassische Website-Builder und Do-It-Yourself-Lösungen, von E-Commerce bis zu Online-Marketing-Tools. Darüber hinaus bietet IONOS Cloud-Lösungen für Firmen, die im Zuge der Weiterentwicklung ihres Geschäfts in die Cloud wechseln möchten.

Geschlecht, Nationalität, ethnischer und sozialer Herkunft, Religion, Behinderung, Alter sowie sexueller Orientierung und Identität, körperlichen Merkmalen, Familienstand oder einem anderen sachfremden Kriterium nach geltendem Recht.

IT System Administrator / IT System Admin (m/w/d)

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