We are supporting a leading banking and financial services partner on several business-critical digital initiatives, including core system modernization, regulatory enhancements, and the evolution of customer-facing platforms. We are looking for an experienced .NET Developer with a solid understanding of frontend technologies to join a modern, highly regulated engineering environment. Logistics Role: Freelance .NET Developer Contract: 12 months (likelihood of extension) 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 scalable backend services using .NET / .NET Core Contribute to greenfield initiatives and long-term platform modernization projects Translate complex business and regulatory requirements into robust technical solutions Apply clean code practices, testing, and collaborative development approaches Support and evolve system architecture in line with modern best practices Build and maintain solutions within CI/CD pipelines Participate in code reviews and agile ceremonies Collaborate with frontend teams to ensure end-to-end solution quality Work on high-availability, security-sensitive financial systems Required Skills 5+ years of experience as a .NET Developer Strong expertise in C#, .NET Core, ASP.NET Solid experience with REST APIs Good knowledge of relational databases (SQL Server, PostgreSQL, Oracle, or similar) Experience with CI/CD tooling and Git-based workflows Working knowledge of frontend technologies (Angular, React, TypeScript) Familiarity with Docker and modern deployment practices Comfortable working autonomously in Agile/Scrum teams Nice to Have Experience in banking or financial services Exposure to legacy modernization or core system transformation Knowledge of security or regulatory constraints Experience with cloud platforms (Azure, AWS, or hybrid) Familiarity with event-driven or messaging-based architectures Interested? Get in touch to discuss details and next steps.