T Hub – Senior QA / Test Engineer (API & E2E)

We are launching a strategic technology project to enable seamless global IoT connectivity by simplifying how international partner platforms are integrated and operated. The initiative focuses on building a common integration layer that abstracts the complexity of diverse external APIs and allows connectivity services to be delivered in a consistent, scalable, and automated way.

At the heart of the project is the development of a Connectivity Management Platform Adapter – a modern, extensible solution that connects multiple partner networks with internal systems, and directly supports the delivery of global IoT services for enterprise customers.

Working at T-Mobile’s T Hub offers a unique and highly rewarding experience in the telecommunications industry, providing opportunities to work with cutting-edge technologies such as 5G, IoT, and AI, and fostering a culture of continuous learning and development.

• 4+ years of professional experience in QA Automation, with a strong focus on API-first products.
• Hands-on expertise in testing REST and SOAP APIs using tools such as Postman, Newman, or custom scripts (Node.js / Go).
• Experience with Playwright or Cypress for end-to-end frontend testing.
• Familiarity with contract testing concepts and tools such as Pact or similar solutions.
• Experience with performance and load testing tools (e.g. K6, JMeter).
• Very good command of English (working language of the project).
• A quality-first mindset combined with the ability to work autonomously in a greenfield environment.

• Define and own the end-to-end quality strategy for a greenfield Connectivity Management Platform integration layer.
• Build and maintain a fully automated API and E2E test suite integrated with the GitLab CI/CD pipeline.
• Ensure accuracy and resilience of API “translations” between external MNO platforms and internal systems.
• Design tests that validate behavior against changing external partner APIs and prevent regressions.
• Monitor production logs, identify edge cases, and proactively simulate real-world failure scenarios.
• Collaborate closely with developers and product teams to embed quality into the delivery lifecycle.