Senior Software Developer (f/m/d) Managed Kubernetes

We are seeking an experienced Senior 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 significant experience with Kubernetes architecture and a strong focus on the operational aspects aligned with CKA (Certified Kubernetes Administrator) principles.

Tasks

• Design, develop, and maintain cloud-native applications in Golang (Kubernetes Operators, REST APIs, libraries).
• Architect and implement new features to enhance our Managed Kubernetes offering.
• Contribute to the evolution of our service architecture and infrastructure as code practices.
• Develop and maintain the complete DevOps toolchain (Helm Charts, GitHub Actions, GitOps workflows).
• Create and maintain Kubernetes operators, controllers, and Custom Resource Definitions (CRDs).
• Implement monitoring, alerting, and observability solutions for Kubernetes workloads; Collaborate with cross-functional teams to improve platform reliability and performance.

Qualifications

• 5+ years of hands-on experience working with Kubernetes in production environments.
• Strong proficiency in Golang development with a track record of delivering production-grade code; Experience with public cloud providers (AWS, GCP, Azure) or private cloud infrastructure.
• Deep understanding of Kubernetes architecture, API resources, and extension patterns; Proficiency with Helm and other Kubernetes package management tools.
• Experience designing and implementing Kubernetes operators and controllers; Expertise in container orchestration, networking, and security principles.
• Experience with observability stacks (Prometheus, Grafana, Loki, etc.) for monitoring and troubleshooting.
• Advanced Linux system administration skills; Strong knowledge of CI/CD pipelines and GitOps workflows.

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.

Benefits

• Hybrid working model with home office option.
• 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.