We are supporting a major utilities partner on several business-critical digital initiatives, including core system modernization and the evolution of customer- and operator-facing platforms. We are looking for an experienced .NET Developer with a strong understanding of Microsoft frontend technologies to join a long-term delivery environment. Logistics Role: Freelance .NET Developer Contract: 12–24 months Location: Brussels (Hybrid – 2 days/week on-site) Languages: English + French or Dutch Start Date: ASAP / Flexible Rate: €(Competitive & negotiable) Responsibilities Design, develop, and maintain backend services using .NET / C# Contribute to greenfield development and modernization initiatives Translate complex business requirements into scalable technical solutions Build and maintain frontend components using Blazor and/or WPF Apply clean code practices, testing standards, and collaborative development Support modular, maintainable system architectures Integrate solutions into CI/CD pipelines and modern deployment environments Participate in code reviews, agile ceremonies, and technical discussions Collaborate across teams to ensure end-to-end solution quality Required Skills 5+ years of experience as a .NET Developer Strong expertise in C# and the .NET ecosystem Hands-on experience with Blazor and/or WPF Solid knowledge of REST APIs and relational databases Experience with CI/CD tooling and Git-based workflows Familiarity with Docker and modern deployment practices Comfortable working autonomously in Agile/Scrum teams Experience on large, business-critical systems Nice to Have Experience in the utilities or energy sector Exposure to legacy modernization or migration projects Knowledge of Azure or cloud-native environments Familiarity with messaging or event-driven architectures Awareness of enterprise security and performance considerations Interested? Get in touch to discuss the role and next steps.