We are seeking an experienced Freelance Test Engineer to support a critical billing project within a leading Belgian infrastructure organisation. This role is central to ensuring the accuracy and reliability of systems used to invoice operational activities across a large-scale network. Logistics: Position: Freelance Test Engineer Duration: 12-month Contract (5-year extension) Location: Brussels (Hybrid model) Start Date: Beginning of July Day Rate: €(Negotiable & Competitive) Languages: Dutch (C1) French (B2) & English Key Responsibilities: Quickly understand the organisation’s in-house billing system and related operational processes Analyse invoicing rules and business logic Create, maintain, and execute test plans and scenarios Analyse results and log defects in ALM (HP Quality Center) Collaborate with developers, analysts, and stakeholders to ensure smooth validation Act as a key contact for Dutch-speaking stakeholders Contribute to QA processes within an Agile/Scrum environment Ideal Candidate: Experience as a Test Engineer in Agile/Scrum environments Strong skills in test planning and scenario creation Experience with test tools (ALM preferred) ISTQB certification (mandatory) Analytical, detail-oriented, and solution-driven Strong communication and collaboration skills Able to quickly understand complex systems Desirable: Experience with UFT or Selenium Basic knowledge of Jenkins, Docker, or Git Familiarity with ALM Experience with billing systems, public sector, or large-scale operational environments Context: Part of a specialised Traffic & Customer Solutions team Focus on a core invoicing platform Replacement role with strong continuity expectations Collaboration with internal teams and external operational partners Soft Skills: Proactive, reliable, and accountable Comfortable working under pressure Strong interpersonal and communication skills Team-oriented, with a positive and respectful mindset Interested in contributing to the reliability of a large-scale national infrastructure system?