Dotnet Developer

Job title: .NET Developer

Location: Brussels, Belgium

Duration: 3 Months (with the intension to extend the mission Long Term

Languages: Dutch OR French AND English

JOB DESCRIPTION:

As a Developer for a Gas Flow Management (GFM) product, you will be part of a cross-functional, agile team responsible for the design, development, and continuous enhancement of digital solutions supporting commercial operations.

The applications you help build and maintain span the entire gas flow management lifecycle—covering customer onboarding, contracting, demand processing, flow planning, network balancing, billing, invoicing, data publication, reporting, and business-to-business messaging. These tools support our core infrastructure activities—transmission, storage, and terminalling—and serve multiple European Transmission System Operators (TSOs)

You will help deliver end-to-end software solutions that are robust, scalable, and tightly aligned with user needs and business goals. You’ll be empowered to shape features, improve system architecture, and contribute meaningfully to a long-lived product that evolves with the energy sector’s rapid transformation.

Key responsibilities

• Design and develop high-quality, maintainable software components within the GFM product ecosystem
• Collaborate closely with product owners, analysts, and business stakeholders to translate real-world challenges into digital solutions
• Contribute to architectural discussions and propose improvements that enhance performance, reliability, and maintainability
• Implement and maintain automated tests and participate in testing activities
• Review code, mentor peers, and uphold coding standards within the teams
• Contribute to release preparation, including technical documentation and deployment activities
• Handle functional and technical service requests from business stakeholders, providing timely and effective support
• Collaborate with the product team to investigate and resolve incidents, ensuring minimal impact on operations
• Participate in monitoring and troubleshoot issues across development, testing, and production environments
• Actively engage in Agile ceremonies: backlog refinement, sprint planning, reviews, retrospectives, and daily stand-ups
• Help create technical items on the product backlog, phrase them in a value-oriented manner understandable by business stakeholders, and support the product owner to prioritize these according to value delivered

Skills & Competencies

• Affinity with the technical stack used by the team:

• Backend: .NET 8 / .NET Framework, ASP.NET Web API, WCF
• Data & Messaging: SQL Server, Oracle, RabbitMQ, NHibernate, Entity Framework
• Architecture & Patterns: Domain-Driven Design (DDD), Clean Architecture, Design Patterns
• Testing & CI/CD: xUnit / NUnit, Azure DevOps Pipelines
• Frontend: Blazor experience is a plus
• DevOps & Tools: Git, Azure DevOps, automated deployment & monitoring tools
• Strong grasp of software design principles, clean coding practices, and architectural thinking
• Experience working with complex systems and maintaining large codebases over time
• Familiarity with modern testing strategies and CI/CD processes
• Ability to engage with both technical and business stakeholders fluently
• Fluency in English; good command of either French or Dutch, with willingness to improve the other