A Senior .NET Consultant is needed for a long-term freelance mission starting early January. The assignment begins with a 6-month contract and can extend.

What you’ll do

• Turn business requests into clean, reliable technical solutions.

• Improve and maintain existing applications with a strong focus on quality.

• Document your work to keep knowledge flowing across the team.

• Stay aligned with the technical landscape and the organisation’s needs.

• Join project and technical leads in reviews and quality checks.

What you bring

• Strong command of .NET and SQL.

• Comfortable working with Classic ASP in a maintenance and improvement context.

• Solid understanding of REST APIs, API design and tools like Swagger.

• DevOps mindset with experience in CI/CD and modern delivery practices.

• Good grasp of software testing principles.

• Hands-on experience with Bitbucket.

• Basic understanding of Windows Server, Active Directory, IIS and JIRA.

• Extra value if you know Java, Azure Functions, Power Automate, AS400 or DB2.

• Familiarity with Agile ways of working and design patterns.

Who you are

• You take ownership of outcomes and client satisfaction.

• You organise your work independently and keep commitments under control.

• You spot improvements and act on them.

• You analyse issues fast and solve problems with structure.

• You handle multiple topics without heavy supervision.

• You communicate clearly and collaborate naturally.

• You respect guidelines and change management rules.

Requirements

• Master’s in Computer Science or equivalent experience.

• Fluent French or Dutch (one national language is mandatory) and fluent English.

If you’re a seasoned .NET freelancer looking for a stable, meaningful mission with real impact, reach out.