Mission offer - .NET developer (Junior/medior) Location: Leuven region (5-10 KM) - 3 days/week on-site Duration: Until end of 2026 (renewable) Ideal start date: Within 1 month after signature Languages: Dutch (spoken) English Status: External consultant / freelance Context & objective of the mission The client is looking for a junior to medior .NET developer with 2 to 5 years of experience to strengthen a small team of 6 developers. The main objective of the mission is to work on several technical projects related to security, system refactoring, digital channels (e-invoicing, Peppol integration), and the implementation of new features within the system (fee adjustments, backups, etc.). Due to recent departures (illness, retirement), the client aims to stabilize the team with a long-term external profile (minimum 2-3 years). There is no critical urgency, but a desire to start as soon as possible. Technical environment Backend: .NET Core (mainly), MS SQL Server, Entity Framework Frontend: Blazor (approximately 25% of the work) Development: Mix of new development (from scratch) and maintenance/support Methodology: Team-based work, with expected autonomy and proactivity Profile 2 to 5 years of experience Young, motivated, curious, with strong learning ability Able to integrate into a small, dynamic team Dutch-speaking (mandatory) and English Available 2 to 3 days per week on-site in Leuvenclose the client's identity, as it is a small organization (risk of direct competition)