Principal Software Development Engineer in Test, US Mobile

• 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 debug flaky tests and CI failures
• 5+ years in Quality Engineering / Test Automation
• Senior or Staff-level experience in a product-driven org
• Deep expertise with Selenium, Playwright, Cypress
• Strong Java background (writing production-quality test code)
• Experience testing microservices & distributed systemsCI/CD experience (GitHub Actions, Jenkins, GitLab, etc.)
• Strong Linux fundamentals
• Proven ability to lead and influence

Desirable

• 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
• 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
• Test Java / Spring Boot microservices
• Validate async workflows (RabbitMQ)
• Test data persistence layers (MongoDB)
• Ensure quality in AWS-based distributed systems
• Partner with DevOps to improve pipelines and observability
• Mentor Software Engineers on test design and automation
• Establish coding standards and review practices for test code
• Influence product and engineering leaders on quality risk and release readiness