Astradi GmbH

Application/System Administrator (m/f/d)

Stellenbeschreibung:

We are looking for a Senior Application/System Administrator (m/f/d) who takes responsibility for the secure operation and continuous development of our infrastructure. This is a hands‑on role that requires a proactive, solution‑oriented mindset and strong technical expertise.

Due to project requirements, applicants must hold German or EU citizenship.

This position requires on-site presence.

Your Responsibilities

  • Operation and administration of servers, storage systems, databases, and virtual machines
  • Support and maintenance of a Public Key Infrastructure (PKI) across Linux and Windows environments
  • Ensuring stability, performance, and security of the IT infrastructure
  • Identifying and implementing process optimizations, especially through automation
  • Supporting security‑related measures and ensuring the stability and performance of the PKI environment
  • Troubleshooting and resolving issues across Windows and Linux systems
  • Handling incidents and service requests in line with ITSM standards
  • Participation in a 24/7 on‑call rotation to ensure system availability

Your Profile

  • Several years of proven experience in administering Linux (RedHat/RHEL) and Windows server environments
  • Good knowledge of VMware ESXi and VMware vCenter administration
  • Excellent skills in application administration and operations
  • Strong understanding of complex application landscapes
  • deep understanding of how applications interact and depend on each other
  • ability to quickly grasp technical relationships and end‑to‑end flows
  • experience with multi‑tier architectures (frontend, backend, middleware, databases)
  • confident debugging of complex error scenarios, especially in integration‑heavy environments
  • Good knowledge of databases, preferably PostgreSQL and Oracle
  • Experience in managing Public Key Infrastructure (PKI)
  • Proficiency with web servers and middleware such as Apache HTTP Server, Apache Tomcat, and JBoss
  • Experience with monitoring tools, ideally CheckMK
  • Knowledge in IT process automation (e.g., scripting, configuration management tools)
  • Solid understanding of networking and security concepts (routing, firewalls, segmentation)
  • Analytical, structured, and independent working style
  • Strong team spirit and willingness to participate in a 24/7 on‑call rotation
  • Motivation for continuous learning and professional development
  • Network & Security: Routing, software firewalls, NetApp
  • Web & Middleware: Apache HTTP Server, Apache Tomcat, JBoss

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Stelleninformationen

  • Veröffentlichungsdatum:

    21 Mär 2026
  • Standort:

    München
  • Typ:

    Vollzeit
  • Arbeitsmodell:

    Vor Ort
  • Kategorie:

  • Erfahrung:

    2+ years
  • Arbeitsverhältnis:

    Angestellt

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