T Hub - Kotlin Developer
Offer summary

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

The project involves scalable backend application development using Kotlin, Java, Spring 3+. Key tasks include designing, building, and maintaining microservices in Kubernetes and Docker environment, implementing RESTful APIs, and collaborating within Deutsche Telekom's international team. Responsibilities include independent technical decision-making, participation in code reviews, and ensuring code quality through unit and integration testing.

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T Hub - Kotlin Developer

Company: T-Mobile

from: 25 June 2026
to: 25 July 2026
salary not specifiedcontract of employment (full-time)
Offer parameters
level:mid
working mode:hybrid
Warszawa, Mokotów
Warszawa, MokotówMarynarska 12View on map

Requirements

Expected technologies

Kotlin
Spring 3+

Operating system

Windows

Our requirements

  • Proven 5+ years’ experience backend services development using Kotlin and Spring 3+
  • Bachelor’s degree in Computer Science or related field
  • Experience with AI assisted code development
  • Strong focus on code quality (self-testing, unit + integration tests development)
  • Great experience with RESTful API development and integration
  • Experience with PostgreSQL and Kafka
  • Strong problem-solving skills and attention to detail
  • Excellent communication and collaboration abilities within a team environment.
  • Confidence to make independent decisions and take ownership of implemented solutions
  • Very good knowledge of English, speaking and writing

Optional

  • Knowledge of Kotlin language is an additional asset
  • Knowledge of containerization and orchestration technologies (Docker, Kubernetes)
  • Familiarity with gitlab CI/CD pipelines
  • Familiarity with automated testing and test driven development (TDD)
  • Understanding of agile development methodologies (Scrum/Kanban)

Your responsibilities

  • Design, develop, and maintain scalable and high-performance backend applications with Kotlin (mainly), Java, Spring, Docker, Kubernetes or other relevant technologies
  • Collaborate with cross-functional teams to define, design, and ship new features, ensuring a seamless and responsive experience
  • Work independently on assigned tasks, from problem analysis through design and implementation, making informed technical decisions when needed
  • Actively contribute to a fail‑fast culture: experiment, validate assumptions early, learn from mistakes, and continuously improve solutions
  • Implement and maintain APIs, ensuring robust and efficient communication of micro-service applications in Kubernetes environment
  • Participate in code reviews, providing constructive feedback and adhering to coding standards
  • Troubleshoot and debug complex issues across the full stack, ensuring optimal performance and reliability
  • Stay updated on industry trends and best practices to continuously improve the development process and technologies used
Company

What we offer

T Hub Poland is a dynamic, forward-thinking division in T-Mobile Poland, where technology matters! It’s a place where best talents converge to ideate, prototype, and implement cutting-edge solutions in international projects held in Deutsche Telekom Group.
As a part of Deutsche Telekom Group, we are building in Poland SAP Center of Excellence to support our T-Systems International Customers in Europe with SAP Analysis, Design and Rollout.
Location: Remote with approx. once per quarter presence in HQ (Warszawa, ul. Marynarska 12)

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 - Kotlin Developer
I apply to:
T-Mobile
Warszawa, Mokotów
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