Senior Engineer, SDET

Company: T-Mobile USA, Inc.
Location: Bellevue
Posted on: May 1, 2025

Job Description:

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
The Sr Software Development Engineer in Test (SDET) tackles a variety of technical challenges. They play an active role in translating business and functional requirements into concrete deliverables 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 Sr SDET resources create high quality, maintainable, and performant code for automated test cases and the frameworks to execute and report them.

In addition to this a Sr SDET is a practice leader both in practice and coaching across all of the disciplines with influence and contributions across teams.

Job Responsibilities:

Testing (Technical)

• Design and implement robust testing strategies for Generative AI solutions
  
• Test functionality, performance accuracy and production sampling
  
• Collaborate with data scientists and ML engineers.
  
• Develop and maintain automated test suites for AI/ML pipelines and APIs
  
• Validate AI generative solutions for bias, fairness and ethical compliance
  
  
  Practice Leadership, Modeling and Coaching: - 20%
  
  • Provides internal training on relevant skills and tools that support Continuous Testing.
    
  • Contributes to Test Community of Practice to evolve testing practices, quality standards and tools.
    
  • Leads defect management.
    
  • Interfaces with external teams on test strategy and ensures alignment to test execution.
    
  • Influences and drives quality across teams, disciplines, and the organization.
    
  • Grows and maintains technical skills and expertise through continuing education and training.
    
    
    Testing (Requirements Gathering)
    
    • Ensures requirements and/or user stories are testable.
      
    • Clarifies any ambiguity with requirements, user stories, design and other artifacts produced as part of the product lifecycle.
      
    • Provides estimates for user stories and tasks.
      
    • Directs testability of requirements and/or user stories.
      
    • Leads and provides input to all test activities.
      
      
      Testing QA
      
      • Closely coordinates with both Dev and Ops regarding testing practices and ensuring quality thresholds are met
        
      • Contributes in Design and Design reviews.
        
      • Contributes in code review.
        
        
        Education:
        
        • Bachelor's Degree in Software Engineering, Computer Science or a related field or the foreign equivalent, and 5 years of progressively responsible postbaccalaureate relevant work experience. (Required)
          
        • Master's/Advanced Degree in Software Engineering, Computer Science or a related field or the foreign equivalent, and 3 years of relevant work experience. (Preferred)
          
          
          Work Experience:
          
          • 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)
            
            
            Preferred Qualifications:
            
            • Proven experience as an SDET Engineer with a focus on AI and data testing
              
            • Familiarity with tools like Postman, SoapUI, or API platform-specific SDKs is vital for interacting with APIs and automating tests
              
            • Proficiency in programming languages such as Python, Java, or C#.
              
            • Proficiency in testing methodologies and test automation tools like Selenium, Apache JMeter, and JUnit.
              
            • Understanding of AI and machine learning concepts, including model evaluation and validation techniques.
              
            • Familiarity with version control systems like Git.
              
              
              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: $89,400 - $161,300
                
                Corporate Bonus Target: 15%
                
                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.

Keywords: T-Mobile USA, Inc., Bellevue , Senior Engineer, SDET, Engineering , Bellevue, Washington