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T Hub - Senior VoIP (IMS) DevOps Engineer
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Offer summary

(Summary generated by AI based on the full job description)

The project focuses on Voice & Messaging systems and AI Calling within IMS telco platforms. Key technologies include VoIP (SIP, SDP, (s)RTP, Diameter), Kubernetes, GitLab CI, Terraform, Python, Prometheus, and Wireshark. Responsibilities cover analyzing and designing requirements, automating testing, operating and improving cloud-native platforms in a DevOps environment, and developing new AI-based speech processing solutions.

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T Hub - Senior VoIP (IMS) DevOps Engineer

Company: T-Mobile

from: 1 September 2026
to: 1 October 2026
salary not specifiedcontract of employment (full-time)
Offer parameters
level:senior
working mode:hybrid
Warszawa, Mokotów
Warszawa, MokotówMarynarska 12View on map

Requirements

Expected technologies

Terraform
Python
Bash
VMware
GitLab
Prometheus
Grafana
Jira
Confluence

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
  • 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.
T Hub is a dynamic, forward‑thinking initiative where technology matters! We serve as the core of innovation within our organization. It’s a place where best talents converge to ideate, prototype, and implement cutting‑edge solutions in international projects held in Deutsche Telekom Group.
At T Hub, you don’t have to choose between big‑tech, software house or startup, between home office or office work, telco or IT, local or international teams – the answer is always YES.
What’s next? Find yourself a super position → Apply → Talk with us → Find yourself in a superposition!
DT IoT is recognized for its leadership in managed IoT services, leveraging a robust IoT platform to provide innovative and scalable solutions for varying customer requirements.
The Packet Core domain of DT IoT focuses on delivering secure, effective and future‑proof connectivity solutions as well as managing complex international IoT ecosystems. The team is responsible for planning, developing and deploying advanced network strategies and customer solutions supporting IoT services, including cloudification and automation. Strong emphasis is also placed on risk management to prevent and minimize potential risks in networks and customer solutions.
This role operates in a DevOps-style environment.
Company

What we offer

  • Employment contract
  • Additional day off on the occasion of birthdays/namedays
  • Medical package and life insurance
  • Benefit platform - you choose what you benefit from
  • Access to training platforms to improve your knowledge
  • I know Talent - training or money for referring friends to work 😊!
  • Besides, with us you can count on access to our products and services at preferential terms and benefits, which you will read about below

Benefits

  • sharing the costs of sports activities
  • private medical care
  • sharing the costs of foreign language classes
  • sharing the costs of professional training & courses
  • life insurance
  • flexible working time
  • corporate products and services at discounted prices
  • integration events
  • mobile phone available for private use
  • no dress code
  • parking space for employees
  • extra social benefits
  • sharing the costs of tickets to the movies, theater
  • holiday funds
  • birthday celebration
  • sharing the costs of a streaming platform subscription
  • employee referral program
  • charity initiatives
  • extra leave
  • Benefit Platform

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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