Senior .NET Developer (Critical Infrastructure Systems)
Brussels-Capital
Digital - Development
Work experience: 0-3
Reference number: 92713

You will work in a mission-critical technology environment supporting large-scale energy infrastructure systems that ensure the reliability and stability of electricity supply.

The applications you help build and maintain are part of a complex, high-availability landscape where quality, correctness, and continuity are essential.

You will join an established development team composed of internal staff and external specialists, contributing to the long-term evolution of existing systems rather than greenfield development. This role suits experienced developers who value impact, accountability, and working on systems with real-world consequences.

Your responsibilities include

  • Developing and maintaining .NET applications used in critical operational contexts.
  • Delivering high-quality, maintainable code in line with defined development standards.
  • Working with both relational and NoSQL data stores.
  • Contributing to backend services and message-based integrations.
  • Collaborating with team members to analyse requirements and implement solutions.
  • Ensuring reliability, performance, and robustness of delivered functionality.
  • Participating in code reviews and quality control activities.
  • Supporting the ongoing evolution and maintenance of existing applications.
  • Taking ownership of assigned tasks and following them through to completion.
  • Communicating clearly with technical and non-technical stakeholders.

What are we looking for?

  • You have proven experience as a Senior .NET Developer.
  • You have strong hands-on experience with .NET 8.
  • You have experience with Entity Framework Core.
  • You have hands-on experience with WPF.
  • You are proficient in SQL Server.
  • You have experience working with MongoDB.
  • You have experience with RabbitMQ or similar messaging systems.
  • You are comfortable delivering code in environments with strict quality standards.
  • You are fluent in French or Dutch, with a passive understanding of the other language, and have a very good level of English.

Nice-to-Have

  • Experience working with micro-services architectures.
  • Experience in high-availability or infrastructure-related systems.
  • Prior exposure to regulated or mission-critical environments.

What do we offer?

Location: Brussels (Belgium)

Work mode: Hybrid

Onsite presence: Minimum 2 days per week onsite

Contract: Freelance or Permanent

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