Senior Application Tester / QA Engineer Job ID: JP054182, Brussels

About the job 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.

Key Responsibilities

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

Required Skills&Experience

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

Languages

English: Active knowledge

French and/or Dutch: Nice to have

Work Conditions

Hybrid working model

Long-term strategic modernization program involvement

Location Brussels

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