Senior Quality Assurance Engineer

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.
With our innovative SolBank lithium-iron phosphate battery technology and comprehensive project services, we’re not just building products we’re powering communities and making a difference worldwide.
Position Title:
Senior Quality Assurance Engineer
Department:
EQS
Compensation:
$90,000 - $130,000 + annual bonus (paid in local currency;

range varies by location)
Reports To:
Development Manager
Location:
Kitchener, ON (Onsite)
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. As Senior Quality Assurance Engineer for EQ-S, you will play a pivotal role in implementing, automating, and supporting the release readiness of leading‑edge EMS software platforms used for energy solution digitalization and operating grid energy systems. With peers and architect, you will design and execute an end‑to‑end test strategy that provides high confidence across EMS workflows, combining Playwright based UI automation with validation of system interactions and telemetry between EMS services. The ideal candidate will possess exceptional skills in test automation engineering for globally distributed energy management systems and be passionate about advancing clean energy initiatives and working collaboratively in a dynamic startup like environment.
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.