Real job — pulled straight from US Mobile’s careers page · Verified July 14, 2026 · No reposts.
Job description
US Mobile is hiring a Principal Software Development Engineer in Test — a full-time, based in Toronto role. Apply directly on US Mobile's careers page below.
Principal Software Development Engineer in Test
Team: Backend
Location: Toronto
Commitment: Full-time
Workplace Type: hybrid
US Mobile is building the future of wireless communication. The goal: one unified network open to any person and any device, worldwide. Connection without walls.
We’re getting there by empowering customers. All three major networks on one phone and one plan, plus home internet from Starlink. No lock-in. No commitments. Custom fit plans at every price point. 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. It’s working — Consumer Reports named us the top-rated mobile carrier two years in a row.*
And we’re building innovative systems that scale. A network agnostic tech stack. Agile, cross-functional teams built on trust and mutual respect. This work isn’t for everyone. If you work fast, flexibly, and collaboratively — without compromising standards — we want to hear from you.
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 debug flaky tests and CI failures
Platform & System Focus:
- 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.
Mentorship & Influence:
- 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
Must Have:
- 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.
Strong Plus:
- 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
Benefits:
- Competitive salary
- Flexible working hours
- Supplemental health insurance
- Professional development stipend
- $500 wfh tech set-up reimbursement
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Frequently asked questions
What skills are required for Principal Software Development Engineer in Test at US Mobile?
The required skills for Principal Software Development Engineer in Test at US Mobile include: Java, Spring Boot, RabbitMQ, MongoDB, AWS, Selenium, Playwright, Cypress, CI/CD, GitHub Actions, Jenkins, GitLab, Linux.
What is the seniority level for Principal Software Development Engineer in Test at US Mobile?
Principal Software Development Engineer in Test at US Mobile is a Principal / Staff / Senior level position.
How do I apply for Principal Software Development Engineer in Test at US Mobile?
You can view the full description and apply for Principal Software Development Engineer in Test at US Mobile on EchoJobs: https://echojobs.io/job/us-mobile-principal-software-development-engineer-in-test-rmnrw.