(Senior) System Engineer - Platform & Security (m/f/d)

Join; United States; Remote; USD 120,000 - 180,000; Full time

Benefits offered by this job

Ownership of hybrid stack

Attractive salary

Direct access to CEO

Remote from Portugal

Modern tech stack

Job summary

Testsieger is seeking an Infrastructure Engineer to own the full Linux server landscape across on‑prem and AWS. You will harden networks, manage security, and automate with Ansible while maintaining container platforms and CI/CD pipelines.

You will collaborate with Engineering, Data, and Product, driving incidents to root cause and aligning with the company’s ownership culture. Join a modern stack including Proxmox, AWS, Ansible, Nomad, Docker, MySQL, Python, GitHub Actions, and Next.js.

Qualifications

• Several years of experience administering Linux server environments (Debian/Ubuntu).
• Strong networking skills: TCP/IP, DNS, load balancing, VPNs.
• Proven security hardening practices; access control and best practices.
• Experience with Ansible in production; container orchestration (Nomad/Kubernetes).
• Experience with AWS or similar cloud platforms.
• MySQL administration in production environments.
• Scripting with Bash and Python for tooling.
• Monitoring, logging and incident troubleshooting as core skills.
• Nice-to-have: Terraform, RabbitMQ, Redis, Zero Trust concepts.
• Fluent English; German a plus.

Responsibilities

• Own operation of Linux server landscape (on-prem and AWS).
• Harden networks, manage firewalls, VPNs, and certificates.
• Automate infrastructure with Ansible, maintain reproducible configurations.
• Maintain container stack (Docker, Nomad, Traefik) and CI/CD (GitHub Actions).
• Administer MySQL in production including backups and performance tuning.
• Extend monitoring and logging with Grafana and New Relic, drive root-cause analysis.
• Collaborate with Engineering/Data/Product and explain architectural choices.

Skills

Linux administration

Networking

Security hardening

Ansible

Nomad

Kubernetes

CI/CD pipelines

AWS

MySQL

Bash

Python

Monitoring

Logging

Troubleshooting

Terraform

RabbitMQ

Redis

Zero Trust

English fluency

Tools

Docker

Proxmox

ZFS

Nomad

Kubernetes

Traefik

GitHub Actions

Next.js ecosystem

Grafana

New Relic

Job description

Do you want to own infrastructure rather than just keep it running? Here, the full stack is yours – from the Proxmox cluster in our own data center, through firewalls and VPNs, to AWS and the deployment pipelines.

Testsieger is one of Germany's largest consumer platforms: 4.2 million products, test reviews, customer ratings and an integrated price comparison that guides millions of users to the right purchase. A team of 20 with short decision paths and no corporate overhead – and an established engineering team in Portugal.
You will be the technical owner of our infrastructure – with a colleague at your side whom you'll grow, and an engineering team that counts on you.

Tasks

• Own the operation of our Linux server landscape: on-premise cluster (Proxmox, ZFS) and AWS
• Run and harden network and security: firewalls, VPN, access control, certificates, hardening – including the network link to our largest partner
• Automate with Ansible and keep infrastructure versioned, reproducible and documented
• Maintain our container platform (Docker, Nomad, Traefik) and CI/CD pipelines (GitHub Actions) so teams ship fast and safely
• Administer MySQL in production: backups, performance, recovery
• Extend monitoring, logging and alerting (Grafana, New Relic) and drive incidents to root cause
• Act as sparring partner for Engineering, Data and Product – and explain why things are built the way they are

Requirements

• Several years running Linux server environments (Debian/Ubuntu) – you know how to get systems from A to B without assistance
• Solid networking: TCP/IP, routing, DNS, load balancing, firewall and VPN administration
• Proven infrastructure security practice: hardening, access control, security best practices
• Ansible in production, container orchestration (Nomad, Kubernetes or similar), CI/CD pipelines
• Experience with AWS or a comparable public cloud
• MySQL administration in production
• Bash and Python – for tooling, not just one-liners
• Monitoring, logging and troubleshooting are your craft, not an afterthought
• Plus: Terraform, RabbitMQ, Redis, Zero Trust concepts
• Fluent English; German is a plus, not a requirement

Benefits

• Full technical ownership of a real hybrid stack (on-premise + cloud) – you make the decisions, not an architecture board
• Well funded company, attractive salary
• Ownership culture with short paths: you talk directly to the CEO
• Modern stack: Proxmox, AWS, Ansible, Nomad, Docker, MySQL, Python, GitHub Actions, Next.js ecosystem
• Remote from Portugal, with regular visits to Osnabrück and colleagues already based in Portugal