Principal Software Development Engineer in Test

US Mobile is looking for a Principal-level SDET to own and elevate our quality engineering practice. This is a technical leadership role for someone who has built, scaled, and stabilized automated test platforms in modern microservices environments.

You’ll lead by example, designing test strategy, improving CI pipelines, mentoring engineers, and ensuring quality is embedded across the SDLC.

Technical Leadership

• Own test architecture and automation strategy across backend and frontend systems.
• Design, build, and maintain scalable automated test frameworks.
• Lead end-to-end, API, integration, and UI automation.
• Drive adoption of best-in-class testing practices.

Hands-on Execution

• Build and maintain pipelines using Selenium, Playwright or Cypress. (Currently using Cypress)
• API testing.
• Improve test stability, performance, and execution time in CI/CD.
• Actively de...