(Senior) DevOps Engineer - Infrastructure & Security (m/f/d)

You don't just want to operate infrastructure, you want to be responsible for it? With us, the entire stack is yours – from the Proxmox cluster in our own data center to firewalls and VPNs, to AWS and the deployment pipelines.

Testsieger is one of Germany's largest comparison portals: 4.2 million products, test reports, customer reviews, and an integrated price comparison that guides millions of users to the right purchase. A 20-person team with direct communication channels and no corporate overhead.

You will take on the role of technical owner for our infrastructure – with a team at your side, and an engineering team that counts on you.

Responsibilities

• You are responsible for operating our Linux server landscape: On-premise cluster (Proxmox, ZFS) and AWS
• You operate and harden network and security: Firewalls, VPN, access control, certificates, hardening – including the network connection to our largest partner
• You automate with Ansible and keep infrastructure versioned, reproducible, and documented
• You manage our container platform (Docker, Nomad, Traefik) and CI/CD pipelines (GitHub Actions) so that the teams can ship safely and quickly
• You administer MySQL in production: Backups, performance, recovery
• You expand monitoring, logging, and alerting (Grafana, New Relic) and investigate incidents to their root cause
• You act as a sparring partner for Engineering, Data, and Product – and explain why things are built the way they are built

Qualifications

• Several years of experience in operating Linux server environments (Debian/Ubuntu) – you know how to move systems from A to B without assistance
• In-depth network knowledge: TCP/IP, routing, DNS, load balancing, firewall and VPN administration
• Demonstrable practical experience in infrastructure security: Hardening, access control, security best practices
• Ansible in production, container orchestration (Nomad, Kubernetes or comparable), CI/CD pipelines
• Experience with AWS or a comparable public cloud
• MySQL administration in production
• Bash and Python – for tooling, not just for one-liners
• Monitoring, logging, and troubleshooting are a craft for you, not an extra effort
• Bonus: Terraform, RabbitMQ, Redis, Zero-Trust concepts
• Good English skills, both written and spoken – our engineering team works internationally

Benefits

• Full technical responsibility for a real hybrid stack (on-premise + cloud) – you make the decisions, not an architecture board
• Attractive salary, on-call duty is compensated and distributed
• Ownership culture with short communication paths: You speak directly with management
• Modern stack: Proxmox, AWS, Ansible, Nomad, Docker, MySQL, Python, GitHub Actions, Next.js ecosystem
• Hybrid work with a base in Osnabrück

If you understand infrastructure as your product and are eager to develop it further with clear responsibility – get in touch. We look forward to hearing from you.