We are seeking an experienced Freelance .NET Developer to support major digital, integration, and regulatory transformation projects within one of Belgium’s leading utilities organisations (energy, grid operations, metering, or market facilitation).
Position: Freelance .NET Developer (Utilities Sector)
Duration: 12-month rolling contract (extensions expected)
Start Date: ASAP or within notice
Languages: English (French or Dutch is a strong plus)
Develop and maintain backend applications using C# / .NET (Core or Framework)
Build and secure REST APIs to support critical utilities operations
Contribute to the modernisation of legacy platforms into microservices / service-oriented architectures
Ensure code quality, performance, and reliability through testing, reviews, and documentation
Support CI/CD pipelines, DevOps practices, and automated deployment workflows
Promote clean coding, maintainability, and continuous engineering improvement across the team
NET backend development experience
~ Proven tenure within Belgian utilities companies (grid operators, suppliers, water/electricity providers, or market facilitators such as Atrias, Fluvius, Sibelga, ORES, Elia)
~ Strong knowledge of OOP, SOLID, and enterprise application design
~ Experience with C#, .NET Core, API development, SQL Server/Oracle/PostgreSQL
~ Familiar with integration patterns or messaging technologies (Kafka, MQ, Service Bus)
~ Strong communicator with a quality-driven engineering mindset
~ Hands-on with unit testing, code reviews, and clean architecture principles
Familiarity with CI/CD, DevSecOps, containers, or cloud platforms (Azure preferred)
Interested in helping shape the future of Belgium’s utilities landscape?