Linux System Administrator - Defense Products

United Internet AG

Job

In this role, you will optimize Linux-based proxy and defense infrastructures, analyze DDoS attacks, and implement innovative mitigation strategies in an agile DevOps environment.

Job summary

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Job technologies

Your role in the team

  • Your daily work is the precise response to the ongoing threat landscape: you balance the highly available operation of our scrubbing platforms with the continuous development 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: They utilize cutting-edge technologies such as AI for log analysis and pattern detection to stay one step ahead of attackers and to implement new mitigation ideas within 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 duty (one week per month). This is not just a duty, but the phase in which you act as the primary defender, intervening directly to prevent major outages.

Our expectations of you

Qualifications

  • 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 see complex platforms as fortresses that do not tolerate any vulnerabilities.
  • 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 like Ansible, Puppet, or Python as standard tools.
  • Language proficiency: In our international environment, you communicate fluently in English; German skills are a valuable advantage.

Experience

  • Experience & Seniority: You have 3-5 years of solid professional experience in managing large infrastructure platforms.

What we offer

  • Hybrid work model.
  • Flexible working hours through trust-based working time.
  • At some locations, there is a subsidized canteen and various free beverages.
  • Modern office spaces with excellent transportation links.
  • Various employee discounts for activities and products.
  • Employee events such as summer and winter parties, as well as workshops.
  • Numerous opportunities for further training and development.
  • Various health offerings, such as sports and wellness courses.

Benefits

Topics you will work on

Job locations

Map of the job locations
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  • Location Karlsruhe
    Baden-Württemberg, Germany
  • Location Berlin
    Germany

About your employer

As the leading provider of communication solutions in Germany, we offer our users a safe and reliable way to communicate with our strong brands: 1&1, GMX, WEB.DE, and mail.com—despite handling 500 million incoming emails every day!

Company type
Established Company
Work model
Onsite, Hybrid, Full Remote
Industry
Internet, IT, Telecommunication

Employer reviews

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Linux System Administrator - Defense Products

United Internet AG