Sr.) Linux / DevOps Engineer

We are IT security specialists: our products encrypt business communications. More than 25% of the 100 highest-revenue companies in Germany, as well as hundreds of medium-sized enterprises across all industries, already use our Z1 encryption solutions. We have big plans and continue to grow steadily. Nearly 140 employees are already working with us in Neukölln. Join our professional, highly qualified team: take on challenges, share your knowledge, learn new things, and discover your potential!

The (Sr.) Linux / DevOps Engineer plays a pivotal role in managing Zertificon Operational Services (ZOS) platforms and environments where Zertificon products are developed, tested and run. The role ensures infrastructure health and security to guarantee smooth and uninterrupted development on our various stages. This role contributes to risk mitigation ensuring operational resilience and strengthening the company through:

• Proactive maintenance and monitoring of Zertificon environments ensuring their availability and full functionality.
• Maintenance of production and R&D hardware, supporting release process and troubleshooting pipelines.
• Ownership and management of our R&D smart self-service solutions

Your tasks

Infrastructure & Automation

• Design, building and automated maintenance of Linux infrastructure (Ansible, Terraform, Bash, Python)
• Solve internal customer needs with infrastructure, tooling and self-service
• Develop and extend CI/CD pipelines using Jenkins
• Manage, troubleshoot and automate hypervisor clusters (XCP-ng)

Monitoring & Maintenance

• Manage monitoring solutions (Prometheus, Grafana) and plan strategic alerts
• Maintain environments: Hardware testing, installation, patches, OS, certificates, firmware

Collaboration

• Contribute to a team of 4-6 by sharing knowledge
• Review pull requests for scripts, playbooks, manifests to safeguard code quality

Strong Linux knowledge

• Solid network knowledge (TCP/IP, routing, proxy) and InfoSec (TLS, certificates)
• Knowledge of databases (backup, restore, troubleshooting, migration)
• Basic datacenter expertise with firewalls, switches, routers, cabling and servers
• Solid understanding of virtualization (XCP-ng / XenServer a plus)
• Strong understanding of Ansible for configuration management
• Solid understanding of Jenkins CI/CD pipelines and Git
• Experience with container technologies (images, registries)
• Excellent English language skills and effective communication

Nice to have

• Kubernetes, Docker Swarm
• Work with cloud providers (Azure, AWS, Google Cloud)
• Experience using Terraform

Flexible hours and home office options

• Mobility: free Germany-wide public transport ticket, bike leasing, or parking
• Subsidies for meals: (e.g., delivery services) and home office internet
• Urban Sports Club membership for flexible fitness and wellness
• Office perks: rooftop terraces & green courtyard, organic fruit and drinks, personal packages accepted at the office
• Get-togethers: monthly Pizza Friday, regular team events, big summer party
• Responsible leadership: structured onboarding, regular feedback, clear goals
• Innovative without startup risk: profitable for 20+ years, self-funded innovation with strong global potential
• International team: 120+ colleagues from 30+ countries, open and collaborative culture