Senior IMS / VoIP Cloud DevOps Engineer

Company Description T‑Systems is part of the Deutsche Telekom Group, with around 30.000 employees worldwide. We create technology with purpose to generate a positive impact on society. We are looking for curious talent, eager to learn, take on challenges, and contribute ideas that transform our customers’ experience.

We trust people: we offer autonomy, continuous support, and a collaborative environment where you can grow without limits. We are one global team, guided by respect, integrity, and a passion for doing better every day.

Job Description Project Description

At the Telco Hub in Madrid, we are pioneers in merging IT and Telco, building and scaling Telco as a Platform (TaaP) on our proprietary layered cloud. Our teams operate in cross-country and cross-functional squads, delivering cutting-edge services to Europe´s most valued Operator. Our mission is to create the best customer experience based on three core principles:

• Cloud-based – Harnessing the latest technologies for scalability and performance.
• Automated – Driving efficiency through AI, automation, and DevOps.
• Sustainable – Building a future-ready, environmentally conscious infrastructure. We are looking for top engineering talent eager to grow technically and professionally in an innovative, dynamic, and collaborative environment. If you are passionate about shaping the future of telecommunications, this is your place!

The Voice & Messaging (T-VM) organizational unit (Tribe) within Deutsche Telekom Technik GmbH bears overall responsibility for all voice and messaging platforms in the fixed and mobile networks of Deutsche Telekom Technik throughout their lifecycle. The platforms managed by T-VM form the basis for a large part of Telekom Deutschland´s core business; therefore, our mission is to simultaneously ensure the success-critical factors of stability, quality, innovation, and efficiency. The ACS Squad (Announcement-, Control & Supportsystems) is responsible for the full lifecycle of critical IMS components within DT Technik.

Responsibilities and Duties:

IMS-MRF (Media Resource Function) deployed on Kubernetes OneiDNS, a cloud-native DNS service for all IMS nodes in fixed and mobile networks, deployed on Kubernetes VoIP Support Systems, a VMware-based application landscape within the IMS fixed network provisioning chain We work as a DevOps team, taking full responsibility from design and engineering to deployment and operation. One of our next major challenges is the development of a new AI Calling system, built on DT Technik’s CaaS Kubernetes platform, enabling real-time speech processing and translation within IMS call flows. To support us on this journey, we are looking for a motivated and technically strong colleague to strengthen our team. Qualifications Must-have requirements:

Good experience with cloud-native technologies and containerized environments Strong proficiency with Containers and Kubernetes orchestration Hands-on experience with IMS architectures and call flows (CSCFs, AS, MRF) Demonstrated experience designing and maintaining CI/CD pipelines (e.g., GitLab CI) Good knowledge of Python and Bash scripting languages Structured troubleshooting methodology and root cause analysis capabilities DevOps mindset with strong ownership mentality Experience with real-time systems and performance optimization in telecommunications environments Familiarity with testing and validation frameworks for cloud-native applications Tools & Platforms:

SIP and Media debugging tools (Wireshark, sngrep) Kubernetes management (kubectl, Helm) CI/CD platforms (GitLab CI, Artifactory) Infrastructure as Code and automation tools (Terraform, AWX, FluxCD) Programming languages (Python, Bash) Observability and monitoring solutions (Prometheus, Grafana, ELK Stack) Agile collaboration tools (Jira, Confluence) Nice-to-have requirements:

Understanding German would be helpful (optional) Experience with AI/ML integration in telecommunications or real-time