Senior Software Engineer - Cloud Platform (m/f/d/x)

Job ID: 775652 Senior Software Engineer - Cloud Platform (m/f/d/x) Bonn, Darmstadt Professional Regular Deutsche Telekom AG **WE DELIVER TECHNOLOGY SOLUTIONS CONNECTING YOUR WORLD!** Group Network Technology (GNT) is a key part of Deutsche Telekom, where international teams shape and deliver innovative telecommunications IT and network technology solutions across Europe - from architecture and engineering to development, testing, infrastructure, and operations. In Cloud, we build and operate Deutsche Telekom’s on-prem Telco Cloud across all layers - from hardware to orchestration - based on open-source technologies. This is where modern infrastructure meets real-world impact at scale. Our chapter-based model creates a strong home for expertise, learning, and collaboration - empowering people to grow, contribute in agile teams, and thrive in an inclusive environment while making a meaningful difference for our customers. **What you'll be doing** * Design, develop, test, and continuously improve cloud-native CaaS and PaaS capabilities, primarily using Go. * Develop Kubernetes operators and controllers to automate cluster, platform, and application lifecycle processes. * Engineer a highly automated Kubernetes platform based on Cluster API and integrate it with the surrounding infrastructure. * Develop and maintain CI/CD and GitOps workflows using technologies such as GitLab CI/CD, Helm, Flux, or Argo CD. * Improve the platform’s scalability, reliability, security, observability, and performance. * Support the migration of existing Kubernetes clusters and contribute improvements to relevant open-source projects. * Take ownership of complex engineering topics, troubleshooting, and root cause analysis. * Collaborate with international engineering and operations teams, provide technical guidance, and mentor other engineers. **What we are looking for** * University degree in Computer Science, Telecommunication Engineering, Information Systems, or comparable qualification. * Fluent in English, verbally and written. * 5+ years of experience in cloud-native environments, with a proven track record in DevOps and platform engineering. **Must-Have Skills** * You are characterized by detailed company-specific knowledge or exceptional specialist knowledge and skills: * Strong software-development experience with Go, including backend services, microservices, or distributed systems. * Hands-on experience developing Kubernetes operators or controllers and working with Kubernetes APIs. * In-depth Kubernetes knowledge, including platform or cluster lifecycle management and troubleshooting. * Experience with Cluster API or comparable cluster-automation technologies. * Experience with automated testing, code reviews, API design, secure coding, and technical documentation. * Experience with CI/CD and GitOps tools such as GitLab CI/CD, Helm, Flux, or Argo CD. * Understanding of observability and cloud-native securi