US Mobile is building the future of wireless communication.

The goal: one unified network open to any person and any device, worldwide. We’re getting there by empowering customers. All three major networks on one phone and one plan, plus home internet from Starlink. 24/7 customer support with real people, empowered to help.

We get real-time feedback from Reddit, surveys, and customer support informing product roadmaps and everything we do. And we’re building cutting-edge systems that scale. A network agnostic tech stack. Agile, cross-functional teams built on trust and mutual respect.

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. Drive adoption of best-in-class testing practices Build and maintain pipelines using Selenium, Playwright or Cypress.



(API testing.

Improve test stability, performance, and execution time in CI/CD. Actively debug flaky tests and CI failures Test Java / Spring Boot microservices. 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 5+ years in Quality Engineering / Test Automation. Senior or Staff-level experience in a product-driven org.

Strong

Java background (writing production-quality test code).

Experience testing microservices & distributed systemsCI/CD experience (GitHub Actions, Jenkins, GitLab, etc.).

Strong

Linux fundamentals. Contract testing (Pact or similar). Performance testing experience. Cloud-native testing in AWS. Observability-driven testing (logs, metrics, traces). Prior experience building QA orgs from messy to mature Competitive salary Flexible working hours Supplemental health insurance 500 wfh tech set-up reimbursement $

📌 Principal Software Development Engineer In Test (Toronto)
🏢 Us Mobile
📍 Toronto