Senior Quality Assurance Engineer in Kitchener

Ready to Make a Real Impact? Join e-STORAGE!

Who We Are

Welcome to e-STORAGE, a proud member of the Canadian Solar Inc. (NASDAQ: CSIQ) family! We’re leading the way in designing, building, and integrating advanced battery energy storage systems for utility-scale projects. Our mission? To accelerate the world’s renewable energy transition and create a more sustainable, resilient energy future for everyone.

About the Role

We are seeking a skilled and passionate Senior Quality Assurance Engineer to join our dynamic team and contribute to the development of an Energy Management System (EMS) for utility-grade systems. The ideal candidate will be responsible for defining and executing a quality strategy that validates critical user personas and their journeys through the EMS User Interface while ensuring system behavior is correct end-to-end. This includes not only visual UI validation, but also verification of internal service-to-service behavior and communications (e.g., MQTT message flows) across the EMS.

Responsibilities

• Lead, develop, execute, and implement end-to-end test strategy for EMS user workflows and system behaviors through the EMS UI.
• Develop and maintain automated end-to-end tests using Playwright, ensuring coverage of core EMS workflows and business-critical scenarios.
• Test and validate critical user personas and their journeys, ensuring correct role-based access, permissions, and operational flows across monitoring and control functions.
• Verify system behavior not only through visual UI validation, but also internal communication through MQTT between various EMS services, validating message topics, payload integrity, sequencing, and system state transitions.
• Perform regression testing for each software release to validate system stability and prevent the reintroduction of defects.
• Conduct feature testing for new functionalities, verifying that all acceptance criteria and requirements are met.
• Design and document test cases based on requirements, user stories, and technical specifications provided by the Company.
• Create and deliver comprehensive test reports summarizing test execution results, defects identified, and recommendations for remediation.
• Collaborate with development and product teams to clarify requirements, reproduce issues, and support defect resolution.
• Maintain and update test automation scripts in alignment with evolving application features and architecture.
• Participate in release planning and quality gates to ensure readiness for production deployment.
• Support continuous improvement of automation reliability (e.g., reducing flaky tests), test execution speed, and CI/CD integration for rapid feedback and release readiness.
• Adhere to Company’s quality standards, security policies, and compliance requirements throughout all testing activities.
• Support cultivating a culture of accountability, transparency, and continuous learning, including clear ownership of test stability and fixing failures introduced by changes (e.g., changes impacting MQTT behaviors).
• Mentor and guide other Quality Assurance and engineering team members on quality practices, testability, automation strategy, and defect prevention.
• Take ownership of their work and contribute to the overall success of the organization.

Required Qualifications and Skills

• Bachelor’s degree in computer science, or related field. Advanced degree or equivalent experience preferred.
• Proficient in modern test automation development using TypeScript/JavaScript, and strong understanding of web application testing methodologies.
• 5+ years of experience in software quality assurance, test automation, and system-level validation for complex software products.
• Proven work experience developing and maintaining automated end-to-end tests using Playwright, with focus on maintainability, robustness, and high coverage of business-critical workflows.
• Experience validating distributed and event-driven systems, including verification of internal communications and message flows (e.g., MQTT).
• Strong experience translating requirements, user stories, and acceptance criteria into test plans, test cases, and automation coverage.
• Experience performing regression testing for each release and participating in quality gates to ensure readiness for production deployments.
• Hands-on experience with defect management, triage, and root-cause analysis, and the ability to collaborate effectively with cross-functional engineering teams.
• Familiar with version control tools such as Git, and have experience in code collaboration CI/CD development.
• Understanding of power electronics, battery management systems, and energy storage technologies is a big plus.
• Able to work independently on assigned tasks and elevate to surface roadblocks and risk mitigation.
• Excellent communication and interpersonal skills, with the ability to effectively collaborate with cross-functional teams and communicate technical concepts to non-technical stakeholders.
• Passion for clean technology innovation and building systems from scratch.
• Have domain experience with software for utility scale photovoltaic or battery energy storage systems is a plus.
• Excellent problem-solving skills and attention to detail.
• Experience with designing test strategy for end-to-end system coverage (UI + services), including test data management and environment readiness.
• Knowledge of testing practices for web applications, including UI validation, API testing concepts, and automation reporting.
• Familiarity with RESTful APIs and web services.
• Experience with test reporting and dashboards, including automated report generation and delivery to stakeholders.
• Familiarity with energy industry regulations, standards, and protocols.
• Experience with agile development methodologies and modern software engineering practices.
• Willingness to travel as needed to support customer engagements, and team collaboration.

What It’s Like To Work Here

• Integrity: We do what’s right, always.
• Innovation: We encourage fresh thinking and bold ideas.
• Quality: We take pride in delivering excellence, every time.
• Customer Focus: We listen, we care, and we deliver.
• Sustainability: We’re passionate about protecting our planet for future generations.

Why You’ll Love Working With Us

• Join a global leader in renewable energy, backed by over 23 years of Canadian Solar experience.
• Work on projects that matter—helping to build a cleaner, greener world.
• Thrive in a supportive, collaborative environment where your growth is our priority.
• Enjoy a competitive salary and a generous benefits package.