Sr. Software Engineer

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?
We're looking for a Senior Software Engineer who not only builds high-quality software but also ensures that it runs reliably and scales in production. This role blends advanced full-stack development with systems reliability practices, giving you end-to-end ownership - from architecture to code, deployment, observability, and mentoring.
Join us to deliver innovative, cloud-native systems that power T-Mobile's customer experiences - and lead the way in shaping our engineering culture!

Job Responsibilities

Software Development

• Design, develop, and maintain full-stack web solutions, including front-end (Angular), back-end (Java/Spring Boot, microservices), and databases (Postgres, Oracle, SQL).
• Extend and optimize data storage mechanisms across relational and non-relational stores.
• Independently design and implement a complete software stack that meets business and customer needs.
• Collaborate in Agile teams, break down features into stories, and write clear documentation.
• Ensure secure coding practices and compliance with enterprise security standards.

Automation & Performance Testing (SDET Focus)

• Lead the design, implementation, and maintenance of test automation frameworks and reusable components.
• Translate business and functional requirements into test strategies and concrete deliverables.
• Develop high-quality, maintainable, and performant code for automated test cases.
• Drive an automation-first strategy to minimize manual testing.
• Implement and execute performance, load, and scalability testing for distributed systems.
• Provide metrics and reporting on test execution, coverage, and software quality using tools such as SonarQube.
• Consult and mentor peers on best practices for test design, automation, and performance validation.

Technical Leadership & Collaboration

• Mentor and guide junior engineers in development and test automation best practices.
• Collaborate with architects, SREs, and cross-functional teams to design technical solutions.
• Contribute to the Test Community of Practice to evolve testing strategies and tooling.
• Advocate for continuous testing, performance improvements, and technical innovation.
• Act as a subject matter expert for full-stack development, automation, and DevOps practices.

Preferred / Nice-to-Have Skills

• Experience with business intelligence/reporting tools, especially Jaspersoft.
• At least 18 years of age
• Legally authorized to work in the United States

What You Bring

• Proven experience as a Senior SDET or Senior Software Engineer with a strong testing focus.
• Hands-on expertise in test automation frameworks (Selenium, JUnit, TestNG, or equivalent).
• Experience with performance/load testing tools (e.g., JMeter, Gatling).
• Strong background in full-stack engineering (Angular, Java/Spring Boot, SQL/Postgres/Oracle).
• Knowledge of cloud-native architecture and containerization (Kubernetes, Docker).
• Familiarity with CI/CD pipelines and test integration (Jenkins, GitLab).

• At least 18 years of age
• Legally authorized to work in the United States
• U.S. citizenship is required for this role. Individuals hired will need to submit documentation proving U.S. citizenship within the first 7 days of hire; failure to do so will result in termination.

Travel:
Travel Required (Yes/No): Yes

DOT Regulated:
DOT Regulated Position (Yes/No): No
Safety Sensitive Position (Yes/No): No

Base Pay Range: $113,600 - $205,000

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.