Test Engineer
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Freelance Test Engineer (Expert) – Brussels (Hybrid)
We are looking for an experienced Freelance Test Engineer (Expert) for a challenging project within a federal public organization based in Brussels.
Project Information
- Start date: 14 September 2026
- Duration: 12 months (extendable)
- Location: Brussels
- Remote: 50% (3 days per week onsite)
- Contract type: Freelance
Languages
- Good knowledge of English
- Good knowledge of Dutch or French
About the project
You will join an ambitious digital transformation program focused on building a modern cloud-native platform. You will work alongside experienced software engineers, analysts, and architects to ensure the quality of a complex enterprise solution based on microservices, APIs, and a Zero Trust architecture.
You will be responsible for defining the test strategy, implementing automated testing, and ensuring quality across the full software lifecycle.
Responsibilities
- Define and implement test strategies and test plans
- Develop and maintain automated test suites
- Perform functional, integration, API, E2E, performance, and security testing
- Integrate testing into CI/CD pipelines
- Set up monitoring and observability solutions
- Collaborate within Agile Scrum teams
- Actively participate in sprint planning, refinement, demos, and retrospectives
Must-have skills
- 10+ years of experience as a Test Engineer (Expert level)
At least 5 years of experience in:
- Cloud testing (preferably Azure)
- Test automation
- Test Driven Development (TDD)
- API testing
- UI testing (preferably Cypress)
- End-to-End (E2E) testing
- Performance, load, and stress testing (JMeter, Gatling)
- Monitoring & observability (preferably Grafana)
- CI/CD pipelines (preferably Azure DevOps)
- Contract testing, mocking, and service virtualization
- Working in Agile delivery teams
At least 3 years of experience in:
- Java SE (Java 10+)
- Python
- JavaScript
- Bash and/or PowerShell
- Unit, regression, and integration testing (JUnit, Cucumber)
- Security testing
- Build tools (Maven)
- NoSQL databases
- Version control, pull requests, and code quality tools
Nice to have
- API design and development
- Microservices architecture
- Cloud software architecture
- Event-driven architecture
- Event-Driven Development (EDD)
- Behaviour-Driven Development (BDD)
- Domain-Driven Design (DDD)
- Experience in the public sector
Profile
You are a pragmatic, hands-on Test Engineer who enjoys contributing to the analysis, design, and implementation of high-quality software. You thrive in Agile environments and have a strong focus on automation, quality, and collaboration.
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