Senior SDET Engineer

T-Mobile

Senior SDET Engineer automating test processes and tools to improve testing efficiency and coverage at T-Mobile. Leading practice leadership and coordinating test activities with development teams.

Posted 6/17/2026full-timePhiladelphia • New York, Pennsylvania • 🇺🇸 United StatesSenior💰 $89,400 - $161,300 per yearWebsite

Tech Stack

Tools & technologies

AndroidiOSJavaJavaScriptSeleniumUnix

About the role

Key responsibilities & impact

Design and maintain automation systems and tools to improve testing efficiency and coverage
Provide practice leadership by training peers, contributing to quality standards, and managing defect processes
Ensure requirements and user stories are testable and provide input to test activities and estimates
Coordinate with development and operations teams to uphold testing practices and quality thresholds
Also responsible for other duties/projects as assigned by business management as needed

Requirements

What you’ll need

Bachelor's Degree plus 5 years of related work experience OR Advanced degree with 3 years of related experience (Required)
Acceptable areas of study include Software Engineering, Computer Science or a related field or the foreign equivalent, and 5 years of progressively responsible postbaccalaureate relevant work experience. (Required)
4-7 years Professional experience using 3 or more development languages (e.g., C#, Java, JavaScript, etc.). (Required)
4-7 years Professional experience using 3 or more automation tools (e.g., Selenium, TestNG, Appium, Sauce Labs, Rest Assured, Postman, Cucumber, Jasmine, Protractor, etc.). (Required)
4-7 years Professional experience with various testing methodologies and strategies: Test Driven Development, Behavior Driven Development, etc. (Required)
4-7 years Professional experience using CA Service Virtualization or equivalent. (Required)
4-7 years Professional experience using issue-tracking software and agile project management systems. (Required)
4-7 years Professional experience designing and developing applications on Unix or Windows environment, mobile platforms (Android or iOS) or designing complex multi-tiered applications. (Required)

Benefits

Comp & perks

medical, dental and vision insurance
flexible spending account
401(k)
employee stock grants
employee stock purchase plan
paid time off
up to 12 paid holidays
paid parental and family leave
family building benefits
back-up care
enhanced family support
childcare subsidy
tuition assistance
college coaching
short- and long-term disability
voluntary AD&D coverage
voluntary accident coverage
voluntary life insurance
voluntary disability insurance
voluntary long-term care insurance
mobile service & home internet discounts
pet insurance
access to commuter and transit programs

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

C#JavaJavaScriptSeleniumTestNGAppiumSauce LabsRest AssuredPostmanCucumber

Soft Skills

practice leadershiptrainingquality standardsdefect managementcoordinationcommunication