Senior C# QA Automation Engineer

About the Position

We are looking for a Senior C# QA Automation Engineer with strong hands-on experience in C#, Selenium, and NUnit to strengthen the quality of our Magento 2 B2B eCommerce platform across multiple markets.

This is a hands-on, automation-focused role where you will design, develop, maintain, and execute automated tests using C# and Selenium, while also contributing to functional, integration, API, and performance testing.

You will work across Magento 2, PIM, ERP, and connected systems, covering critical eCommerce processes such as product catalogues, pricing, promotions, checkout, orders, and customer journeys. You will also support CI/CD-based automated test execution, API testing, performance testing, releases, and new market rollouts.

The ideal candidate is a C# QA Automation Engineer / SDET with a passion for automation and quality assurance in a complex B2B eCommerce environment.

Responsibilities

• Design, develop, maintain, and execute automated tests using C# and Selenium
• Contribute to functional, integration, API, and performance testing
• Work across Magento 2, PIM, ERP, and connected systems
• Support CI/CD-based automated test execution, API testing, performance testing, releases, and new market rollouts
• Analyze performance testing results and support performance improvement initiatives
• Provide testing and quality support during go-live and post-release validation activities
• Maintain test documentation and contribute to QA processes, test strategies, effort estimation, and continuous improvement

Requirements

• At least 5 years of professional experience in QA/testing B2B eCommerce
• Strong knowledge of Magento 2 and B2B eCommerce processes
• Hands-on experience with PIM systems and product catalog management
• Experience with ERP systems, preferably Infor LN
• Proficiency in Selenium, C#, and NUnit for test automation
• Good understanding of CI/CD pipelines and automated test execution
• Experience with performance testing using JMeter and K6, with a preference for K6
• Knowledge of REST API and GraphQL testing
• Experience with integrations between eCommerce, PIM, ERP, and connected systems
• Understanding of functional, regression, exploratory, integration, and end-to-end testing
• Experience supporting application releases, market rollouts, smoke testing, and production validation
• Fluent in English - minimum level B2

Nice to Have

• Deep experience with Infor LN
• Familiarity with Microsoft Dynamics 365 Business Central
• International experience in B2B eCommerce across multiple markets
• Knowledge of eCommerce integration architectures
• Contribution to QA strategy, automation frameworks, and continuous improvement initiatives
• Experience in performance optimization and analysis of large eCommerce platforms

We Offer

• Opportunity to work in a dynamic and innovative environment
• Competitive salary and benefits package
• Professional growth and development opportunities
• Collaborative and inclusive work culture

About the Company

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Technologies & Tools

Must have

• Magento 2
• B2B eCommerce
• PIM
• ERP
• Selenium
• C#
• NUnit
• CI/CD
• REST
• GraphQL
• Apache JMeter
• k6

Nice to have

• Infor LN
• Microsoft Dynamics 365 Business Central