Senior Software Engineer – Cloud Platform

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. • Participate in on-call rotation (for stand-by operations). 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. Technical 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 security principles. Nice-to-Have • Experience with controller-runtime, Kubebuilder, or open-source contributions. • Knowledge of advanced Kubernetes networking, multi-cluster environments, or Infrastructure as Code. • Experience integrating Kubernetes with OpenStack, VMware, bare-metal, storage, or networking infrastructure. • Telecommunications, OSS/BSS, or large-scale private-cloud experience. Don't worry if you miss some of these skills – we are here to grow and develop you. Social skills • A mindset of continuous learning, willingness to share knowledge and learn from others. • Ability to innovate and find solutions to complex problems. • Being a strong individual contributor and an empathic team player. • Being supportive to colleagues and a mentor for junior coworkers. • Ability to communicate effectively with different stakeholders in the company up to management level. What you can expect • Our team is dedicated to supporting new team members and we're building an environment that appreciates knowledge sharing and mentorship. Our experienced team members are passionate about coaching junior and new members of the team. • We take a long-term commitment when it comes to our employees. You will develop your career working in truly innovative projects of Deutsche Telekom Group, exploring the latest trends and technologies which enable the product development process. • We offer an open and friendly working environment, competitive remuneration package and attractive benefit scheme. • Enjoy the benefits of flexible hours, part-time roles, and remote work options - so you can balance your career with family life and personal priorities. Benefits: * HUF 700,000 gross pro-rata cafeteria budget * HUF 45,000 / month gross telecommunications services discount which you may apply to Telekom services you or a close family member of yours subscribe to. * Flexible working hours with partial home office options. * Comprehensive benefits package (laptop, mobile phone, cafeteria, insurance).Employee discount rates on Telekom services. * Modern, multinational working environment with amenities like a sky bar and rooftop gym. * Access to our Employee Assistance Program. * Comprehensive Healthcare Package * You will receive a minimum of 25 days of basic vacation per year (based on age) * We offer 15 days of additional vacation if you become a father, with 100% pay * You'll have access to thousands of professional and skills development materials from our extensive digital training palette * We offer regular internal training sessions and workshops * You can learn English and German, even with a native speaker * You’ll have access to Percipio and Coursera courses Connect with us: Clemens, Chapter Area Lead Cloud - https://www.linkedin.com/in/clemensloos/