Staff Software Engineer (f/m/d) Managed Kubernetes

About IONOS At IONOS, we don't just manage servers – we shape the digital future for more than 6.2 million customers worldwide with our solutions. As Europe's leading hosting provider and a pioneer in independent cloud solutions, we are building next-generation infrastructure – from sovereign cloud architectures and high-performance GPU clusters to integrated AI automation tools. What drives us is digital sovereignty for Europe and real impact for small and medium-sized businesses (SMBs) as well as large enterprises. We work in agile teams, rely on transparent structures, and believe that excellence and innovation only emerge through true team spirit. Ready for your next step? 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). Tasks - 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. Qualifications - 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 - Willingness to undergo extended security vetting (SÜ2) Benefits - 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. Application Note 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.