ACS Security Engineer - AI Calling

About the role

T-Systems Iberia is looking for an ACS Security Engineer (AI Calling) for its Telco Hub in Madrid, which builds and scales the Telco as a Platform on a proprietary layered cloud. The role sits in the ACS Squad, responsible for the full lifecycle of critical IMS components, and involves a DevOps team taking responsibility from design and engineering to deployment and operation. The team is also developing a new AI Calling system on the CaaS Kubernetes platform for real-time speech processing and translation.

Key responsibilities

• Support the IMS-MRF (Media Resource Function) deployed on Kubernetes
• Support OneiDNS, a cloud-native DNS service for IMS nodes in fixed and mobile networks
• Support VoIP support systems, a VMware-based application landscape in the IMS fixed network provisioning chain
• Contribute to the development of the new AI Calling system
• Work as a DevOps team covering design, engineering, deployment and operation

Required profile

• Good experience with cloud-native technologies and containerized environments
• Hands-on experience with IMS architectures and call flows (CSCFs, AS, MRF)
• Demonstrated experience designing and maintaining CI/CD pipelines (e.g. GitLab CI)
• Structured troubleshooting and root cause analysis, DevOps mindset with strong ownership
• Experience with real-time systems and performance optimization in telecom environments
• Nice to have: understanding of German, AI/ML integration in telecom or real-time speech processing, and familiarity with the CaaS Kubernetes platform

Required skills

• Containers and Kubernetes orchestration
• Python and Bash scripting
• SIP and media debugging (Wireshark, sngrep)
• Kubernetes management (kubectl, Helm)
• CI/CD platforms (GitLab CI, Artifactory)
• Infrastructure as Code and automation (Terraform, AWX, FluxCD)
• Observability and monitoring (Prometheus, Grafana, ELK Stack)
• Testing and validation frameworks for cloud-native applications

What we offer

• Hybrid work model and flexible working hours
• Customized training via Coursera and weekly language classes
• Flexible compensation plan including health insurance, meal vouchers, childcare and transport
• Telemedicine, life and accident insurance, social fund and 26+ vacation days