DevOps Engineer Enterprise Core Services (m/f/d)

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 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 Data Tribe (T-DAT) within the Services & Platforms (T-SP) division bears holistic responsibility for all data services in the fixed and mobile networks throughout their entire lifecycle. The Packet Core Supersquad/Enterprise Core Squad is responsible for our business customer services in our mobile core networks. In this position, you will analyze new customer and business requirements, design suitable solutions, and initiate all necessary developments and adaptations in our state-of-the-art cloud-native 4G and 5G core networks.

Responsibilities and Duties:

Analyze customer and business requirements and translate them into suitable solution and system designs and into clear technical requirement descriptions for the implementation teams. Engineering and designing cloud-native network functions. Improve implementations to optimize customer experience, reliability and efficiency. Design and development of automation solutions for the provisioning and operation of services. Design and create high availability solutions and disaster recovery plans to ensure service stability and rapid recovery. Provide support for complex projects across development, quality assurance, and project planning, as well as assist with the implementation of new mobile core software releases. Collaborate closely with involved implementation teams to streamline processes, enhance software and system performance and apply innovative technologies and concepts. Qualifications Must-have requirements:

In-depth understanding of mobile core network applications, including their functions, procedures, interfaces and protocols in 4G enhanced packet core (4G ePC), 5G non-standalone core (5G NSA) and 5G standalone core (5G SA). Several years of professional experience in a telecommunications company, specifically in the operation of telecommunications services (incident, problem, and change management). Experience in operating of containerized network functions (CNF, ideally Mavenir products) in cloud-native environments. Hands-on experience in administering Linux machines. Hands-on experience in tracing and protocol analysis in microservice architectures. Ability to work both very independently and in international, cross-cultural teams.

Nice-to-have requirements:

Experience in classic and agile project management. Tools and Platforms

5G SA 5G NSA 4G ePC GSMA-DNS Linux Admin (Ubuntu, RedHat) BIND 9 GitLab (CI/CD pipelines) Ansible Kubernete