Specialist Software Engineer

At IONOS, the leading European provider of cloud infrastructure, cloud services and hosting services, you will work together with a wide range of teams. We are characterized by open structures, a friendly working culture and flat hierarchies with a strong team spirit. We firmly believe that work and fun are compatible, and offer you the right environment for this. Our constant growth means that we are always looking for new colleagues. Become part of IONOS and grow with us.

We are seeking an experienced Specialist Software Developer to join our Managed Kubernetes team. You'll play a crucial role in developing and maintaining our Managed Kubernetes Product that serves both internal IONOS teams and external customers. This position requires experience with Kubernetes architecture and a strong focus on operational aspects aligned with the principles of CKA (Certified Kubernetes Administrator).

• Design, development, and maintenance of cloud-native applications in Golang (Kubernetes Operators, REST APIs, libraries).
• Designing and implementing new features to improve our Managed Kubernetes offering.
• Contribute to the further development of our service architecture and infrastructure-as-code processes.
• Development and maintenance of the complete DevOps toolchain (Helm Charts, GitHub Actions, GitOps workflows).
• Creation and maintenance of Kubernetes operators, controllers and custom resource definitions (CRDs).
• Implement monitoring, alerting, and observation solutions for Kubernetes workloads; collaborate with cross-functional teams to improve platform reliability and performance.

• 3+ years of hands-on experience working with Kubernetes in production environments
• Proficiency in Golang development with a track record of delivering production-grade code
• Understanding of Kubernetes architecture, API resources, and extension patterns
• Knowledge of container orchestration, networking, and security principles
• Knowledge of CI/CD pipelines and GitOps workflows
• Experience with observability stacks (Prometheus, Grafana, Loki, etc.) for monitoring and troubleshooting
• Linux system administration skills

Nice-to-have:

• Kubernetes certifications (CKA, CKAD, CKS).
• Experience with infrastructure automation tools (Terraform, Ansible).
• Experience with multi-cluster and multi-tenant Kubernetes architectures.
• Contributions to open-source Kubernetes ecosystem projects.

Note: At the end of the application process, candidates must undergo a security check. Your consent will be requested in good time during the process.

• Hybrid working model.
• Flexible working hours through trust-based working hours.
• At some locations a subsidized canteen and various free drinks.
• Modern office space with very good transport connections.
• Various employee discounts for activities and products.
• Employee events such as summer and winter parties, as well as workshops.
• Numerous training and development opportunities.
• Various health offers, such as sports and health courses.

IONOS is the leading European digitalization partner for small and medium-sized businesses (SMB). The company serves around six million customers and operates across 18 markets in Europe and North America, with its services being accessible worldwide. With its Web Presence & Productivity portfolio, IONOS acts as a 'one-stop shop' for all digitalization needs: from domains and web hosting to classic website builders and do-it-yourself solutions, from e-commerce to online marketing tools. In addition, the company offers Cloud Solutions to enterprises who are looking to move to the cloud as their businesses evolve. 

We value diversity and welcome all applications - regardless of, for example, gender, nationality, ethnic or social origin, religion, disability, age as well as sexual orientation and identity, physical characteristics, marital status or any other irrelevant factor subject to applicable law.