Senior Functional Tester (API Automation & UI Manual Testing)
Brussels-Capital
Digital - Testing and QA
Work experience: 7-10
Reference number: 92701

You will be responsible for validating that software applications function correctly at both functional and technical levels.

You work as part of a software delivery team, collaborating closely with functional analysts, developers, and engineers.

Your role covers end-to-end testing activities, from integration and qualification to user acceptance support, with a strong focus on quality assurance and continuous improvement.

Your responsibilities include

  • Defining and maintaining the overall test strategy for assigned applications and projects.
  • Reviewing business requests, functional analyses, and technical documentation from a testing perspective.
  • Designing, creating, and executing test cases, test scenarios, and test plans.
  • Performing manual UI testing and automated API testing.
  • Following up on defects and issues, including reporting, tracking, and validation of fixes.
  • Producing structured test reports and quality status updates.
  • Automating test cases using appropriate tools based on technology and context.
  • Supporting delivery teams by estimating testing effort and contributing to test planning.
  • Participating in end-to-end testing involving external partners.
  • Supporting end users during user acceptance testing (UAT).
  • Contributing to continuous improvement of testing processes, standards, and deliverables.
  • Supporting quality assurance initiatives across the software delivery lifecycle.

What are we looking for?

  • You hold a Bachelor’s degree or higher.
  • You have a minimum of 5 years of relevant experience in software testing.
  • You have proven experience with manual UI testing.
  • You have proven experience with automated API testing.
  • You have experience defining and executing test strategies.
  • You have strong knowledge of testing processes and methodologies.
  • You have experience testing Java-based services, web services, and REST APIs.
  • You have experience working with XML, XSD, WSDL, and related open standards.
  • You have solid experience analysing and modelling complex processes and workflows.
  • You have hands-on experience with Jira, Xray, and ReadyAPI.
  • You have experience working in Agile delivery environments.
  • You have experience with Groovy scripting or an equivalent scripting language.
  • You are fluent in Dutch and English OR French and English, and have a good understanding of the third language.
Nice-to-Have
  • ISTQB certification.
  • Experience with Katalon or Selenium.
  • Basic knowledge of OWASP security testing principles.
  • Experience working with public administration systems.

What do we offer?

Location: Brussels (Hybrid)

Onsite presence: Minimum 2 days per week (mandatory)

Fixed onsite day: Monday

Second onsite day: Wednesday or Friday

Contract: Freelance or Permanent

Start date: 02 February 2026

End date: 31 December 2026

Kenneth Van Cleynenbreugel
Business & Talent Consultant
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