Senior Application Tester / QA Engineer Job ID: JP054182

Senior Application Tester / QA Engineer (Hybrid – Brussels)

We are looking for an experienced Senior Application Tester / QA Engineer to support a large-scale modernization program focused on migrating a legacy platform to a modern microservices and Kubernetes-based architecture.

The role involves ensuring software quality across API-driven and event-based systems while working closely with Agile delivery teams in a complex enterprise environment.

• Design, prepare, and execute manual and automated test plans and test cases
• Validate functional and non-functional requirements
• Perform API testing and integration testing across distributed systems
• Identify, document, and track defects and quality issues
• Support exploratory testing and edge-case analysis from an end-user perspective
• Contribute to Agile/Scrum delivery processes and continuous quality improvement
• Coach and support team members on testing best practices
• Collaborate with developers, analysts, QA teams, and stakeholders to ensure software quality
• Produce clear reporting and documentation of testing activities and results

• Strong experience in software testing within Agile environments
• Expertise in:
• BDD and Gherkin
• API testing (Postman, SoapUI, OpenAPI)
• Jira, Confluence, and Xray
• Test planning, defect management, and test documentation
• Message queue testing (ActiveMQ, RabbitMQ, DLQ handling)
• JSON, API versioning, pagination, idempotency, and error semantics
• Good understanding of programming logic and system interactions
• Experience with exploratory testing and critical quality analysis
• Knowledge of Selenium and Playwright is considered a plus
• ISTQB or similar testing certifications are highly valued

• English: Active knowledge
• French and/or Dutch: Nice to have

• Hybrid working model
• Long-term strategic modernization program involvement

Location

Brussels