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Job Description
Your mission
You'll be the cornerstone of our technical infrastructure — the person who keeps everything running, secure, and ready to scale. As our On-Premises DevOps Engineer, you'll bridge development and operations, automating workflows, hardening our systems, and ensuring the reliability our production environment depends on. From network security to CI/CD pipelines, you'll own the full infrastructure stack and play a critical role in building the factory of tomorrow.
What you'll do
Design, implement, and maintain our network infrastructure, including firewall configuration and segmentation
Run and evolve our virtualization and containerization platforms (Proxmox, Docker, Docker Swarm)
Build and maintain CI/CD pipelines that deliver software reliably to production
Apply Infrastructure as Code practices so our environment is reproducible, auditable, and recoverable
Administer Linux servers — security, performance, availability, and the unglamorous work that keeps them healthy
Configure reverse proxies, manage NAS systems, and own the storage and traffic layers
Implement logging, monitoring, and alerting so we know about problems before our colleagues do
Provide infrastructure support across all tiers — you're the person teams come to when something breaks
Collaborate with developers to make systems more reliable, observable, and easier to operate
Document the stack so it's not all in one person's head
Your profile
Strong Linux server administration (Ubuntu in our case), including security hardening
Real network experience: Fortinet firewalls, TCP/IP, VLANs, switching (we use AOS-CX)
Virtualization and containers: Proxmox, Docker, Docker Swarm
Infrastructure as Code with Ansible and/or Terraform
CI/CD pipeline experience, especially GitLab CI/CD and Github Actions
Comfortable with reverse proxy configuration (Nginx, Traefik)
Monitoring and observability across the stack (Zabbix, Grafana, Prometheus, Elastic Stack)
The temperament for on-prem work — methodical, security-minded, and calm when production hardware is involved
Nice to have:
NAS administration, particularly TrueNAS
Experience supporting production or manufacturing environments
Background bridging IT and OT (operational technology) in a hardware-adjacent setting
Why us?
At Zellerfeld, you will find a multidisciplinary team of engineers, SW and HW specialists, entrepreneurs, designers, and students with a common passion. We embrace contrarian thinking, humility, pushing limits, and improving ourselves. We utilize a flat hierarchy, and we want your voice to be heard. We also care about bonding because we want to be a tight-knit community, so be prepared to spend quality time with everyone, including the CEO!
As a company specializing in both hardware and software, we value close collaboration within our team. Therefore, we are seeking candidates who can join us at our office in Hamburg.