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About the Role

US Mobile is seeking a Principal SDET to lead and enhance their quality engineering practices. This technical leadership position involves building, scaling, and stabilizing automated test platforms within microservices environments, driving quality throughout the SDLC.

Responsibilities

• 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.
• Build and maintain pipelines using Selenium, Playwright or Cypress.
• Perform API testing.
• Improve test stability, performance, and execution time in CI/CD.
• Actively debug flaky tests and CI failures.
• 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.

Requirements

• 5+ years in Quality Engineering / Test Automation.
• Senior or Staff-level experience in a product-driven organization.
• Strong Java background (writing production-quality test code).
• Experience testing microservices & distributed systems.
• CI/CD experience (GitHub Actions, Jenkins, GitLab, etc.).
• Strong Linux fundamentals.
• Proven ability to lead and influence.
• Contract testing (Pact or similar).
• Performance testing experience.
• Cloud-native testing in AWS.
• Observability-driven testing (logs, metrics, traces).
• Prior experience building QA organizations from messy to mature.

Skills

• Selenium
• Playwright
• Cypress
• Java
• Spring Boot
• RabbitMQ
• MongoDB
• AWS
• DevOps
• GitHub Actions
• Jenkins
• GitLab
• Linux
• Pact

Location

• US

Work Type

• Flexible working hours

Experience Level

• Principal-level
• Senior or Staff-level

Salary/Compensations

• $140,000 - $180,000 a year

Benefits

• Competitive salary
• Flexible working hours
• Supplemental health insurance
• Professional development stipend
• $500 wfh tech set-up reimbursement

About the Company

• US Mobile is building the future of wireless communication with the goal of one unified network open to any person and any device, worldwide.
• They empower customers with all three major networks on one phone and one plan, plus home internet from Starlink, offering no lock-in, no commitments, and custom-fit plans.
• They provide 24/7 customer support with real people.
• Consumer Reports named them the top-rated mobile carrier two years in a row.
• They are building innovative systems that scale with a network-agnostic tech stack and agile, cross-functional teams built on trust and mutual respect.