Medior Test Specialist
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Medior Test Specialist – Freelance
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Brussels, Belgium | Hybrid | 2 days on-site per week
Full-time | 2-year assignment | Start date: 9 November 2026
Asenium is looking for four Freelance Medior Test Specialists to join a dedicated testing team on a long-term project within the Belgian energy sector.
Working under the coordination of an experienced Team Lead and alongside a Senior Test Specialist, you will contribute to the preparation, execution and documentation of structured functional testing activities.
Key responsibilities
-Analyse functional requirements and acceptance criteria.
-Prepare test scenarios, test cases and test data.
-Execute manual functional, sanity and regression testing.
-Validate data by writing and executing SQL queries.
-Test services and integrations using SOAP UI and XML.
-Compare actual results with expected outcomes.
-Record defects clearly and ensure appropriate follow-up.
-Perform retesting and non-regression testing.
-Contribute to first-level defect analysis.
-Document test results, evidence and progress.
-Communicate risks, blockers and deviations to the Team Lead.
-Collaborate with analysts, developers, suppliers and other testers.
-Participate in knowledge-transfer and continuous-improvement activities.
Required profile
-Professional experience as a Functional Tester, Test Analyst or Test Specialist.
-Experience preparing and executing structured test cases.
-Knowledge of functional, sanity and regression testing.
-Familiarity with formal testing methodologies and techniques.
-Experience in Agile/Scrum or Waterfall environments.
-Practical knowledge of SQL.
-Experience or working knowledge of SOAP UI and XML.
-Ability to understand functional requirements and technical documentation.
-Experience with defect registration and follow-up.
-Strong analytical skills and attention to detail.
-Ability to work effectively within a structured, collaborative testing team.
-English at C1 level or above.
-French or Dutch at C1 level or above.
-Availability to work full-time and attend the Brussels office at least 2 days per week.
Preferred qualifications
-Experience in the Belgian energy sector.
-Knowledge of structure, measure, cross-domain, billing, infeed or settlement processes.
-ISTQB Foundation Level certification or higher.
-Experience with SAT testing.
-Familiarity with DevOps, VBScript or test automation.
-Experience in international or multilingual environments.
Assignment details
-Number of positions: 4
-Contract: Freelance through Asenium
-Location: Brussels, Belgium
-Working model: Hybrid, with 2 days per week on-site
-Workload: Full-time
-Start date: 9 November 2026
-Duration: 2 years
-Daily rate: To be agreed in euros based on experience
Interested? xirbnpk Please apply with your updated CV, availability, expected daily rate, language proficiency and relevant certifications.
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