Sr Software Engineer

Overview

At T-Mobile, we invest in YOU! Our Total Rewards Package ensures employees receive a competitive base salary and a comprehensive compensation package. We offer wealth-building opportunities through our annual stock grant, employee stock purchase plan, 401(k), and access to free, year-round money coaches.

Join us as a Senior Software Engineer who builds high-quality software that 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. Help deliver innovative, cloud-native systems that power T-Mobile"s customer experiences and shape our engineering culture.

• 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 Sonar Qube.
  • 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 Dev Ops practices.

• Experience with business intelligence/reporting tools, especially Jaspersoft.
• 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.

• 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, Git Lab).

Travel
:
Travel Required (Yes/No):
Yes

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

Compensation
:
Base Pay Range: $113,600 - $205,000;
Corporate Bonus Target: 15%

This pay range is a general guide for a successful candidate. Actual starting pay will vary based on location, qualifications, and experience.

Benefits
:
We offer medical, dental, vision, 401(k), employee stock grants, employee stock purchase plan, paid time off and holidays, parental and family leave, disability and life insurance, and additional voluntary benefits. Eligible employees may also receive mobile service and home internet discounts and access to commuter programs.

To learn about T-Mobile's benefits, see the benefits information published by the company.

Never stop growing. We are committed to equal opportunity employment for all, and we prohibit discrimination and harassment of any kind. If you need reasonable accommodation during the application or interview process, please contact Applic or call