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Offer summary
(Summary generated by AI based on the full job description)
Project involves work in an international team on IMS/VoIP and development of an AI Calling system for a network operator. Stack includes SIP, SDP, (s)RTP, Diameter, IMS, containerization with Kubernetes (kubectl, Helm), CI/CD GitLab CI, FluxCD, Artifactory, automation Terraform, AWX and scripting in Python, Bash. Responsibilities cover analyzing and designing functional and technical requirements, developing and automating tests for cloud-native IMS components, operating and improving Kubernetes telco platforms in a DevOps setup, supporting and automating CI/CD pipelines, performing structured troubleshooting and root cause analysis, participating in on-call duty and actively contributing to real-time speech processing and translation within IMS call flows.
from: 13 November 2026
to: 13 December 2026
salary not specifiedcontract of employment (full-time)
Offer parameters
level:mid • senior
working mode:remote • hybrid
Warszawa, Mokotów
Requirements
Operating system
Windows
Linux
Our requirements
- Detailed VoIP know-how (SIP, SDP, (s)RTP, Diameter, IMS, able to explain call-flows on protocol level)
- Containers & Cloud: Kubernetes (kubectl, Helm), VMware
- CI/CD: GitLab CI, Artifactory
- Automation: Terraform, AWX, FluxCD
- Programming / Scripting: Python, Bash
- Observability: Prometheus, Grafana, ELK
- IMS & VoIP: SIP & Media debugging (Wireshark, sngrep)
- Agile tools: Jira, Confluence
Optional
- Systems You Will Work With: IMS-MRF (Media Resource Function) deployed on Kubernetes, OneiDNS – a cloud‑native DNS service for IMS nodes in fixed and mobile networks, VoIP Support Systems within the IMS fixed network provisioning chain
Your responsibilities
- Analyze and design functional and technical requirements for Voice & Messaging systems, platforms, and AI services
- Develop, maintain, and automate testing for cloud native IMS components
- Operate and improve Kubernetes based telco platforms in a DevOps setup
- Support and automate CI/CD pipelines to ensure high quality and fast delivery
- Perform structured troubleshooting and root cause analysis
- Participate in on call duty and call out procedures for critical systems
- Actively contribute to the development of a new AI Calling system, enabling real time speech processing and translation within IMS call flows
About the project
We are looking for Voice Over IP Team Members to join an International Team of experts!
You will be located in Poland and work as part of International Team of Deutsche Telekom, which serves millions of customers and delivers services across the Globe.
Recruitment stages
- 1.Let’s meet to better understand each other's expectations.
- 2.Hiring Manager will receive your application after meeting.
- 3.Technical meetings with the Hiring Manager and/or team.
- 4.Time to decide!
T-Mobile
Working at T-Mobile’s T Hub will offer you an unique and highly rewarding experience on IT market. As a leader in the telecommunications industry, T-Mobile not only provides a platform to hone your technical skills but also empowers you to be a catalyst for innovation. You'll have the opportunity to work at the forefront of cutting-edge technologies, from 5G to IoT and AI, shaping the future of connectivity. Our commitment to fostering a diverse and inclusive workplace means you'll collaborate with a wide range of talented professionals, learning and growing together. T-Mobile encourages a culture of continuous learning and development, offering mentorship and support to help you thrive in your career.
This is how we work
T Hub - Senior VoIP (IMS) DevOps Engineer
I apply to:
T-Mobile
Warszawa, Mokotów
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