Full‐Stack .NET Developer – Gas Flow Management PlatformDuration: Immediate start; initial 3‐month contract with strong potential for extensionSetup: Freelance (Daily rate / Limited Company / Umbrella / Sole Trader)Location: Brussels (3 days onsite, 2 days remote)Join a cross‐functional, agile team designing and enhancing end‐to‐end digital solutions across the gas flow management lifecycle: customer onboarding, contracting, demand processing, flow planning, network balancing, billing, reporting and B2B messaging. You’ll shape a scalable, robust platform that underpins transmission, storage and terminalling for multiple European TSOs.Key ResponsibilitiesDesign, develop and maintain high‐quality software components using .NET 8/.NET Framework with ASP.NET Web API and WCFTranslate business requirements in collaboration with product owners and analysts into clean, testable codeContribute to architectural discussions around Domain‐Driven Design, Clean Architecture and established design patternsImplement and maintain automated tests (xUnit, NUnit) and integrate CI/CD pipelines via Azure DevOpsReview peers’ code, mentor junior developers and uphold coding standardsSupport release activities: technical documentation, deployments, incident investigation and live‐environment troubleshootingParticipate fully in Agile ceremonies: sprint planning, backlog refinement, reviews, retrospectives and daily stand‐upsTechnical Stack & SkillsBackend: .NET 8/.NET Framework, ASP.NET Web API, WCFData & Messaging: SQL Server, Oracle, RabbitMQ, NHibernate, Entity FrameworkTesting & CI/CD: xUnit/NUnit, Azure DevOps PipelinesFrontend: Blazor (advantageous)DevOps & Tools: Git, automated deployment and monitoring