New

Principal Engineer, SDET

T-MOBILE USA, Inc.
$106,000 - $191,100Corporate Bonus Target: 20%
life insurance, vision insurance, flexible benefit account, paid time off, paid holidays, tuition assistance, 401(k)
United States, Texas, Frisco
3560 Dallas Parkway (Show on map)
Sep 10, 2025
At T-Mobile, we invest in YOU! Our Total Rewards Package ensures that employees get the same big love we give our customers. All team members receive a competitive base salary and compensation package - this is Total Rewards. Employees enjoy multiple wealth-building opportunities through our annual stock grant, employee stock purchase plan, 401(k), and access to free, year-round money coaches. That's how we're UNSTOPPABLE for our employees! Job Overview Are you ready to join the Un-carrier movement? The Principal Software Development Engineer in Test (SDET) takes on a variety of technical challenges within the Billing Domain in support of non production testing and certification. They play an active role in translating business and functional requirements into concrete work and building test systems in partnership with other technology leaders within the team. They are a core member of the development team and participate in the complete development lifecycle process. They develop, implement, and sustain test automation processes, practices, and controls in support of application and system requirements, development and test activities throughout the software development and sustainment lifecycles. They lead and consult on test automation strategy, requirement, design, implementation and execution. The Principal SDET resources compose high quality, maintainable, and performant code for automated test cases and the frameworks to complete and report them. A Principal SDET is a practice leader both in practice and coaching across all of the disciplines with influence and contributions across teams, organizations and companies. They are innovating through technology, and practices while establishing and maintaining principles that all SDETs use to drive better outputs in quality, efficiency and performance. We are a team that encourages innovation and advocates an agile and open approach, truly working and playing in the Un-carrier way! Job Responsibilities: Practice and Innovation Leadership Define and drive the overall test architecture, frameworks, and automation strategy across multiple program, projects and platforms. Champion a shift-left approach to testing, ensuring quality is built into every stage of the SDLC. Contributes to Test Community of Practice to evolve testing practices, quality standards and tools. Leads, trains and mentors associate, mid-level and senior SDETs. Testing (Technical) Applies Systems Thinking to test activities to drive improvement into test practices. Works with different test teams and ensures alignment to test execution. Designs, develops and maintains core test frameworks and automation systems. Reviews source code for potential problems; reproduces, debugs, and isolates problems and verifies fixes. Analyzes feature and test code using tools like SonarQube to drive improvement in code quality, reliability and maintainability. Interacts with IT partner teams and Senior management to shape and align solutions against desired minimum viable product scope. Grows and maintains technical skills and expertise through continuing education and training. Testing (Requirements Gathering) Clarifies any ambiguity with requirements, user stories, design and other artifacts produced as part of the product lifecycle. Provides technical expertise in test planning, estimation, risk assessment, and defect management. Testing QA Influences and drives quality across teams, fields, and the organization. Performs system-wide root cause analyses and drives improvements. Leads code review. Leads Design and Design Reviews. Education and Work Experience: Bachelor's Degree Software Engineering, Computer Science or a related field or the foreign equivalent, and 5 years of progressively responsible post-baccalaureate relevant work experience. (Required) Master's/Advanced Degree Software Engineering, Computer Science or a related field or the foreign equivalent, and 3 years of relevant work experience. (Preferred) 7-10 years Professional experience using 3 or more development languages (e.g., C#, Java, JavaScript, etc.). Desired. 7-10 years Professional experience using 3 or more automation tools (e.g., Tosca, Selenium, TestNG, Appium, Sauce Labs, Rest Assured, Postman, Cucumber, Jasmine, Protractor, etc.). Required 7-10 years Professional experience with various testing methodologies and strategies: Test Driven Development, Behavior Driven Development, etc. Required 7-10 years Professional experience using CA Service Virtualization or equivalent. Preferred 7-10 years Professional experience using issue-tracking software and agile project management systems. Required 7-10 years Professional experience designing and developing applications on Unix or Windows environment, mobile platforms (Android or iOS) or designing complex multi-tiered applications. Preferred Knowledge, Skills and Abilities: Agile (Required) End-to-end Testing (Required) Problem Solving (Required) Analytics (Required) At least 18 years of age Legally authorized to work in the United States Travel: Travel Required (Yes/No): Yes DOT Regulated: DOT Regulated Position (Yes/No): No Safety Sensitive Position (Yes/No): No Base Pay Range: $106,000 - $191,100 Corporate Bonus Target: 20% The pay range above is the general base pay range for a successful candidate in the role. The successful candidate's actual pay will be based on various factors, such as work location, qualifications, and experience, so the actual starting pay will vary within this range. At T-Mobile, employees in regular, non-temporary roles are eligible for an annual bonus or periodic sales incentive or bonus, based on their role. Most Corporate employees are eligible for a year-end bonus based on company and/or individual performance and which is set at a percentage of the employee's eligible earnings in the prior year. Certain positions in Customer Care are eligible for monthly bonuses based on individual and/or team performance. To find the pay range for this role based on hiring location, click here. At T-Mobile, our benefits exemplify the spirit of One Team, Together! A big part of how we care for one another is working to ensure our benefits evolve to meet the needs of our team members. Full and part-time employees have access to the same benefits when eligible. We cover all of the bases, offering medical, dental and vision insurance, a flexible spending account, 401(k), employee stock grants, employee stock purchase plan, paid time off and up to 12 paid holidays - which total about 4 weeks for new full-time employees and about 2.5 weeks for new part-time employees annually - 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, and voluntary long-term care insurance. We don't stop there - eligible employees can also receive mobile service & home internet discounts, pet insurance, and access to commuter and transit programs! To learn about T-Mobile's amazing benefits, check out www.t-mobilebenefits.com. Never stop growing! As part of the T-Mobile team, you know the Un-carrier doesn't have a corporate ladder-it's more like a jungle gym of possibilities! We love helping our employees grow in their careers, because it's that shared drive to aim high that drives our business and our culture forward. By applying for this career opportunity, you're living our values while investing in your career growth-and we applaud it. You're unstoppable! T-Mobile USA, Inc. is an Equal Opportunity Employer. All decisions concerning the employment relationship will be made without regard to age, race, ethnicity, color, religion, creed, sex, sexual orientation, gender identity or expression, national origin, religious affiliation, marital status, citizenship status, veteran status, the presence of any physical or mental disability, or any other status or characteristic protected by federal, state, or local law. Discrimination, retaliation or harassment based upon any of these factors is wholly inconsistent with how we do business and will not be tolerated. Talent comes in all forms at the Un-carrier. If you are an individual with a disability and need reasonable accommodation at any point in the application or interview process, please let us know by emailing ApplicantAccommodation@t-mobile.com or calling 1-844-873-9500. Please note, this contact channel is not a means to apply for or inquire about a position and we are unable to respond to non-accommodation related requests.