ACS Security Engineer - AI Calling

At T-Systems, you will find groundbreaking projects that contribute to social and ecological well-being. We want to welcome new talents like you, who bring fresh ideas, different points of view, who accept challenges and continuous learning, to grow and impact society… All this, in a fun way!

It doesn't matter when or where you work. It's about doing work that matters to move society forward. For this reason, we will do everything possible to ensure that you have every opportunity to develop by offering you a support network, excellent technology, a new work environment and the freedom to work independently. We support you to constantly grow both personally and professionally, so that you can leave a notable mark on society.

T-Systems is a team of around 28,000 people employed around the world, making us one of the world's leading providers of integrated end-to-end solutions. We develop hybrid cloud and artificial intelligence solutions and drive the digital transformation of companies, industry, the public sector and, ultimately, society as a whole.

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.

Activity description and concrete tasks:

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.

Skill 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)

Preferred Qualifications:

•  Understanding German would be helpful (optional)
• Experience with AI/ML integration in telecommunications or real-time speech processing systems
• Knowledge of Deutsche Telekom's CaaS Kubernetes platform or similar proprietary cloud solutions

 

What do we offer you?

• International, positive, dynamic and motivated work environment.
• Hybrid work model (teleworking/on-site).
• Flexible schedule.
• Continuous training: Preparation for certifications, access to Coursera, weekly English and German classes...
• Flexible compensation plan: health insurance, meal vouchers, childcare, transport assistance...
• Life and accident insurance.
• More than 26 working days of vacation per year.
• Social fund.
• Free service for specialists (doctors, physiotherapists, nutritionists, psychologists, lawyers...)
• 100% of salary in case of sick leave.

And many more advantages of being part of T-Systems!

If you are looking for a new challenge, do not hesitate to send us your CV in English. Join our team!

T-Systems Iberia will only process the CVs of candidates who meet the requirements specified for each offer.