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.

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