Skills

Python Java JavaScript Bash PowerShell NoSQL Encryption CI/CD DevOps Monitoring Version Control Azure DevOps Test Test Automation Security Testing Virtualization Regression Azure api testing Agile CI/CD Pipelines Microservices

Job Specifications

Job Title: Test Engineer

Contract Duration: 01/04/2026 - 31/03/2027 (This contract starts in April 2026)

Languages Required: (Dutch or French) & English

Work Location: Brussels (Hybrid, 3days/week onsite)

Job Description - Roles and Responsibilities

As an expert-level test engineer, you must understand the entire eDossier stack and IT design solution in order to advise and guide the team in the design and development of high-quality, secure, and robust solutions.
You use your technical expertise and experience to contribute to all sprint events (planning, refinements, retrospectives, demonstrations).
You continuously develop your own expertise while acquiring, updating and disseminating your knowledge of new tools and practices within the team.
As a test engineer, you are responsible for developing (and adjusting) an action plan for testing within our eDossier solution, as well as its operational implementation.
As a test engineer, you are responsible for functional testing: validation of business logic in microservices and APIs, data integrity testing and E2E testing of user flows.
As a test engineer, you will be responsible for API testing: validating API contracts (openAPI) and testing functionality, performance, security, and compatibility between microservices and external systems.
Automating API tests for continuous integration will be a key focus.
As a test engineer, you are responsible for integration testing: testing the interaction between microservices and COTS components, as well as with external APIs and adapters.
You also simulate error scenarios to test the system's durability.
As a test engineer, you are responsible for security testing in a context where authentication, authorization and encryption are essential.
As a test engineer, you are responsible for performance and scalability testing of microservices and APIs, as well as the solution as a whole.
As a test engineer, you are responsible for developing and maintaining automated test suites within CI/CD pipelines to enable rapid feedback within DevOps processes.
As a test engineer, you are responsible for implementing monitoring and traceability of our solution across our environments (dev, test, acc).

Skills

Experience working within Agile delivery teams
API testing frameworks & tools
Bash and/or PowerShell
Security testing
Build tools
Contract testing, mocking & service virtualization
End-to-End (E2E) testing
NoSQL database usage
Test integration into CI/CD pipelines
Java SE 10+
Monitoring & observability of software solutions
Performance, stress & load testing
Python & JavaScript
Test-Driven Development (TDD)
Test automation
Testing of cloud (native) solutions
UI test frameworks & tools
Unit, regression & integration testing
Version control, pull requests & code quality tools
Java SE (general experience)
Azure Devops

About the Company

OneSource is a pan European based recruitment, employment agency founded in response to the market demands for more flexible, cost-effective, tailored recruitment solutions. It aims at providing high-quality services to provide the best outcomes in the recruitment and employment of personnel from a diverse set of business sectors. In today's highly competitive and ever-changing IT market, hiring the right candidate can make the difference between success and failure of any mission-critical project. We can navigate you throu... Know more