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.

Project Description:

• Control of internet access and network infrastructure.
• Management of millions of parallel sessions.
• Provision of key functions such as:
  • Authentication / Authorization / Accounting (AAA).
  • Dynamic provisioning
  • Support of all-IP services (e.g. MagentaTV, IP telephony).

Activity Description:

• Execute and validate software releases through structured testing.
• Develop and enhance test automation frameworks.
• Maintain and evolve CI/CD pipelines and test environments.
• Operate and support test systems, including deployment of software deliveries
• Design, execute, and document platform-level test cases, including reporting for formal acceptance
• Define and refine test cases to extend coverage and validate new functionalities
• Integrate solutions into the Deutsche Telekom test framework
• Ensure proper documentation within internal tool systems
• Perform troubleshooting and provide operational support during testing and rollout phases
• Support internal and external stakeholders in the test environment

Required Skills

• Strong knowledge of IP network infrastructure.
• Advanced Linux expertise.
• Experience with IP protocols (Radius, Diameter, SIP, SOAP).
• Cloud technologies: containers, Kubernetes, Docker.
• Database knowledge (Redis, SQL databases).
• Experience with software testing methodologies (manual and automated testing).
• Familiarity with testing tools (e.g., Jira, Robot Framework).
•  CI/CD toolchain experience (e.g., Git, Ansible, Cucumber, Flux, Argo).
• Basic programming skills (e.g., Java, Python, JavaScript) are an advantage.
• Experience with AI-supported testing tools is a plus.
• Strong understanding of requirements and specifications.
• English proficiency (minimum B2 level).

Methodological Competencies

• Analytical and structured thinking.
• Detail-oriented and precise working style.
• Strong skills in defect analysis and documentation.
• Solid understanding of testing processes (e.g., Agile, Scrum).

Personal Qualifications

• Strong teamwork and communication skills, especially in international environments.
• High level of initiative and accountability.
• Solution-oriented mindset.
• Willingness to learn and adapt to new technologies.
• Flexibility to work night shifts and participate in on-call duties.

What do we offer you?

What do we offer you? 

Work environment & flexibility 

• International, dynamic and collaborative environment.
• T-Social: social initiatives (sports, community, health, ...).
• Hybrid work model (remote/on-site).
• Flexible working hours.

Growth & development 

• Customized training: access to Coursera to learn whatever you want, whenever you want.
• Weekly language classes (English & German).
• International Mentoring Sessions & Experience Days.

Compensation & benefits 

• Flexible compensation plan (health insurance, meal vouchers, childcare, transport).
• Telemedicine.
• Life and accident insurance.
• Social fund.

Wellbeing & time off 

• 26+ working days of vacation per year.
• Free access to specialist services (medical, legal, wellness).
• 100% salary coverage during medical leave.