System Engineer - Virtualization (f/m/d)

at subsidary GMX, WEB.DE & mail.com in Karlsruhe or Munich
Full-time | Permanent | Professionals
Reference ID: M-323

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About us

With our strong brands GMX, WEB.DE and mail.com and over 42 million active users, we are the leading email and communications platform in Germany, Austria and Switzerland. From this strong market position, services and apps are developed that simplify users' digital lives - from office tools and cloud solutions to personal ID management.

Your Tasks

Are you passionate about virtualization, Linux systems, and automation? As a Systems Engineer, you’ll help shape a highly available HCI platform that powers one of Europe’s largest email services, serving over 42 million users across WEB.DE, GMX, and mail.com. This platform delivers cloud-like virtualization "on-prem" with GitOps-style management, elastic workloads, and transparent "VM to Kubernetes" interoperability through KubeVirt. Your work enables application teams to run workloads securely, efficiently, and with predictable performance across data centers, while laying the foundation for future Kubernetes-native platform services.

Are you ready to take ownership of virtualization architecture for a platform serving millions? Do you thrive on performance challenges and building scalable clusters?

You will:

• Design, implement, and operate a Harvester- and Kubernetes-based virtualization platform.
• Integrate distributed storage and manage compute resources across clusters.
• Automate provisioning, lifecycle, troubleshooting, and monitoring using Ansible, GitOps pipelines, and APIs.
• Conduct migrations, performance tuning, benchmarking, and incident response across virtualization estates.
• Collaborate with platform, networking, and storage teams to ensure robust end-to-end infrastructure services.

We Appreciate

Do you have hands-on experience with virtualization and Kubernetes-based infrastructure? Are you skilled in Linux and automation tooling?

We believe the following will help you succeed:

• Strong understanding of virtualization technologies (Harvester, KubeVirt, QEMU/KVM, Proxmox, VMware, or similar).
• Experience with Kubernetes ecosystems, ideally including Helm, CNI, CSI, CRDs, and GitOps workflows.
• Knowledge of distributed storage systems, especially Longhorn (or Ceph).
• Proficiency with Linux systems, debugging, monitoring, and performance tuning.
• Automation experience using Bash, Ansible, Python, Puppet, and infrastructure-as-code principles.

What else we would like to tell you

???? Lived corporate culture: Flat hierarchies, a culture of respect and appreciation, signatories of the Diversity Charter, open communication, and no dress code.

???? Wide range of further training: Internal and external training opportunities, LinkedIn Learning, language courses, talent development programs, conferences, and mentoring.

???? TEC-Campus: Free choice between Linux, Mac, or Windows, slack days, conferences, lecture series, courses, open-source projects, community meetups, and user groups.

❤️ Active health care: Wellpass, free internal sports and fitness classes, health days, family & care support services, discounts at fitness centers, mental health first responder, fresh fruit and drinks for free.

???? Mobility: Subsidy for job bike leasing, job ticket, and relocation service if you live outside Germany.

???? Flexible working models: Home office options, flexible working hours, and 30 days of vacation with the option for additional unpaid leave.

???? Financial benefits: Corporate benefits, company pension scheme, capital-forming benefits, occupational disability insurance, and various partner discounts.

???? Events: Summer and winter parties, sports tournaments, and team events.

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