Job
- Level
- Experienced
- Location
- Berlin, Karlsruhe
- Working Model
- Hybrid, Onsite
- Job Field
- IT, Network, Security
- Employment Type
- Full Time
- Contract Type
- Permanent employment
Job Summary
In this role, you will manage Linux-based defense systems against DDoS attacks, operate complex proxy infrastructures, and develop automation solutions to neutralize cyber threats in real-time.
Job Technologies
Your role in the team
- 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).
- As a 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.
- 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: Administration and troubleshooting of 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.
- Innovation & Data-Driven Defense: We leverage modern AI tools for log analysis and pattern detection.
- You will bring creative ideas to the table, utilizing the ELK Stack and ClickHouse to manage high-volume telemetry, identify attack signatures, and devise advanced mitigation strategies.
- Lifecycle & Pipeline Management: Develop and optimize CI/CD pipelines in an agile DevOps environment.
- 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.
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Our expectations of you
Education
- Because this role manages critical national and corporate infrastructure, the barrier to entry involves both technical mastery and a high degree of professional trust.
Qualifications
- 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.
- Practical knowledge of BGP, Flowspec, and Anycast routing.
- A passion for eliminating repetitive tasks through Ansible, Puppet, and Python.
- Strong passion for automation using tools like Ansible, Puppet, and Python to eliminate repetitive manual tasks.
- Strong analytical skills to evaluate DDoS attacks, implement effective countermeasures, and continuously develop our defense platforms.
- Like us, you are a strong advocate for Open Source, especially Linux.
Experience
- Therefore, we require 3 to 5 years of platform operating experience at scale.
- Nachweisliche Erfahrung in der Konfiguration von Nginx als Reverse Proxy oder Web Application Firewall (WAF).
- 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.
- Initial experience with technologies such as Docker, Kubernetes, ClickHouse, or the ELK Stack is beneficial.
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What we offer
- Hybrid working model.
- Flexible working hours through trust-based working hours.
- 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.
- Various health offerings, such as sports and wellness courses.
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Topics You Will Work On
Job Locations
About Your Employer
Berufliche Schulen Potsdam der ASG - Anerkannten Schulgesellschaft mbH
The Vocational Schools Potsdam of ASG offer a practice-oriented training for educators that closely integrates academic theory with professional practice. A competent team of instructors and regular collaborations with practice partners support the preparation for pedagogical roles in child and youth welfare.
Description
- Company Type
- Established Company
- Working Model
- Hybrid, Onsite
- Industry
- Education System
Linux System Administrator Defense Products
- Location
- Berlin, Karlsruhe
- Working Model
- Hybrid, Onsite
- Diversity
- Open for all genders
- English Only
- English only required
