Senior IT System Engineer / IT Operations (m/w/d)

In this key position, you will be responsible for the stability and scalability of our business-critical infrastructure. We operate a large e-commerce platform where downtime is not an option. As a Senior 3rd Level IT Specialist, you will take ownership of our entire setup—from the physical hardware in our data centre and highly available clusters to modern container architectures. You will design secure, high-performance systems and combine traditional enterprise infrastructure with cutting-edge cloud-native technologies and AI-supported processes.

You will serve as the final escalation point for complex technical challenges. Platform Operations & Infrastructure Data Centre & Virtualisation: Independently operate and maintain our physical server infrastructure in the data centre. Design and administer our virtualisation environments based on Microsoft Windows Hyper-V, including standalone hosts and failover clusters. Backup & Disaster Recovery: Take responsibility for data security and rapid recovery scenarios, including RTO and RPO, using Veeam Backup & Replication. 3rd Level Support & Administration: Perform in-depth troubleshooting and administer our core Microsoft infrastructure, particularly Microsoft 365 and Exchange Online.

Monitoring & Alerting: Proactively monitor the system landscape using Datadog, Wotan, and Pingdom. Define SLA reporting and alerting workflows via webhooks, email, and SMS. Infrastructure Documentation: Maintain accurate and up-to-date network and system documentation in NetBox. Platform Performance & Security Engineering Traffic Management & Web Security: Ensure the 24/7 availability of our e-commerce platform. Manage load balancing using HApee Enterprise (HAProxy) and take responsibility for security and performance optimisation through our Akamai Web Application Firewall (WAF).

Database & Web Infrastructure: Operate and optimise highly available Microsoft SQL Server clusters and manage IIS and Nginx web servers to reliably handle traffic peaks in our online shop. Container Orchestration & DevOps: Scale our modern container environments using Kubernetes, Docker, and Podman to support agile deployment processes. Network & Security: Manage the network infrastructure, including VLANs and Ubiquiti UniFi, as well as internal IT security through Sophos firewalls.

Automation & AI: Develop complex automation solutions using PowerShell and Bash. Use AI tools such as Claude Code to improve efficiency and support AI workloads, for example Nvidia Spark. Several years of professional experience in 3rd level support or system administration within a business-critical environment, ideally in e-commerce or web hosting Hands-on experience operating data centre hardware, combined with deep expertise in virtualisation, particularly Hyper-V clusters, and database high availability using SQL Server clusters Strong knowledge of traffic management, load balancing with HAProxy or HApee Enterprise, and edge security and CDN solutions, particularly Akamai WAF In-depth knowledge of web server administration, including Nginx and IIS Hands-on experience with container orchestration using Kubernetes and modern DevOps tools such as Docker and Podman Strong knowledge of network segmentation using VLANs, firewalls such as Sophos, and backup strategies using Veeam Excellent scripting skills in PowerShell and Bash for process automation Experience with enterprise monitoring solutions such as Datadog, Pingdom, and Wotan Strong analytical skills, resilience in critical system situations, and a pronounced hands-on mentality Very good written and spoken German skills, at least C1 level Work-life balance: Flexible start times and 28 vacation days, increasing with years of service, plus optional company pension scheme Personal development budget: Negotiable based on individual needs Additional benefits: €50 tax-free non-cash benefit per month Workplace equipment: Height-adjustable desks, ergonomic office chairs, and two monitors at every workstation Team events: Large summer party, team lunches, and additional team events