Sr Engineer, SDET [T500-21338]

About T-Mobile :

T-Mobile US, Inc. (NASDAQ : TMUS), headquartered in Bellevue, Washington, is America’s supercharged Un-carrier, connecting millions through its strong nationwide network and flagship brands, T-Mobile and Metro by T-Mobile. Customers benefit from an unmatched combination of value, quality, and exceptional service experience.

About TMUS Global Solutions :

TMUS Global Solutions is a world-class technology powerhouse accelerating the company’s global digital transformation. With a culture built on growth, inclusivity, and global collaboration, the teams here drive innovation at scale, powered by bold thinking.

TMUS India Private Limited operates as TMUS Global Solutions.

About the Role :

The Senior Software Development Engineer in Test (SDET) is a core member of the development team, participating across the full development lifecycle. This role translates business and functional requirements into deliverables, designs and maintains test automation frameworks, and ensures automated tests are integrated into the continuous delivery pipeline. The Sr SDET develops high-quality, maintainable, and performant test code, consults on test automation strategy, and serves as a leader and coach across teams to influence quality practices and standards

What You’ll Do :

Design, develop, and maintain automation systems and tools to be used by development and test engineers.

Analyze code coverage using industry-standard tools (e.g., SonarQube).

Oversee integration of automated tests into the Continuous Delivery pipeline.

Design and author test cases for unit, functional, performance, scalability, and durability testing.

Manage and groom automated and manual test suites for balanced coverage and fast feedback cycles.

Work with IT partner teams to provide, create, or modify test data through repeatable, automated processes.

Provide internal training on testing skills and tools; contribute to the Test Community of Practice to evolve testing practices and standards.

Lead defect management and interface with external teams on test strategy and execution.

Ensure requirements and / or user stories are testable and provide estimates for user stories and tasks.

Coordinate with Dev and Ops regarding testing practices to ensure quality thresholds are met.

Contribute to design and code reviews.

Perform other duties and projects as assigned by business management.

What You’ll Bring :

Bachelor’s degree in Software Engineering, Computer Science, or related field and 5 years of relevant experience, OR Master’s degree and 3 years of experience.

4–7 years of experience using three or more development languages (e.g., C#, Java, JavaScript).

4–7 years of experience with three or more automation tools (e.g., Selenium, TestNG, Appium, Sauce Labs, Rest Assured, Postman, Cucumber, Jasmine, Protractor).

4–7 years of experience with testing methodologies such as Test Driven Development (TDD) and Behavior Driven Development (BDD).

4–7 years of experience using CA Service Virtualization or equivalent.

4–7 years of experience using issue-tracking software and Agile project management systems.

4–7 years of experience designing and developing applications on Unix or Windows, mobile platforms (Android or iOS), or complex multi-tier applications.

Must Have Skills :

Hands-on experience in

Java

or

Spring Boot

for developing and maintaining test automation frameworks.

Proficient in

automation testing

of backend services and APIs.

Strong knowledge of

REST APIs , including testing and validation.

Experience using

Postman

or

Rest Assured

for API-level testing.

Familiarity with

Swagger / OpenAPI

for understanding and validating API contracts.

Skilled in

Cucumber

for behavior-driven development (BDD) and integration into automated pipelines.

Exposure to cloud platforms like

AWS

or

Azure

for deploying and testing applications in cloud environments.