Medior Developer .NET

Medior Developer .NET (Freelance) – 4 months – Brussels, Belgium

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Intro

RELYzIT Talent is seeking a Medior Developer .NET (Freelance) to join our client’s high-impact migration project in Brussels. This is your opportunity to shape the backbone of essential business tools, modernizing critical systems and ensuring service continuity for a leading organization. If you’re ready to build solutions that matter, this is your stage.

Why This Role Matters (Mission & Outcomes)

Our client is embarking on a pivotal migration project to modernize and enhance the reliability of core information tools supporting their Benefits Service. As a Medior Developer .NET, you will play a central role in transforming legacy systems, driving seamless integration, and ensuring uninterrupted business processes. Your expertise will directly impact the organization’s ability to deliver robust, future-ready services to its stakeholders.

What You’ll Be Doing

• Lead the development and integration of .NET-based components within a complex migration project.


• Collaborate closely with the architecture group to design, document, and customize solutions that align with business needs.


• Analyze and synthesize information to propose and implement effective technical alternatives.


• Ensure the seamless integration of new and existing systems, maintaining a coherent and scalable architecture.


• Apply critical thinking to evaluate data, establish logical connections, and draw actionable conclusions.


• Generate and assess multiple solution alternatives, selecting the most effective approach for each challenge.


• Document technical decisions and ensure knowledge transfer within the team.


• Contribute to testing strategies, including unit and integration testing, to guarantee solution quality and reliability.

What We’re Looking For

• Ownership mentality: You take initiative, drive outcomes, and thrive in environments where your impact is visible.


• Analytical mindset: You excel at breaking down complex problems, evaluating alternatives, and synthesizing information into actionable solutions.


• Collaboration: You work effectively with architects, fellow developers, and stakeholders to deliver integrated, high-quality results.


• Adaptability: You are comfortable navigating change and ambiguity, always seeking the best path forward.


• Proven experience in .NET development, with a strong track record of delivering impactful solutions.

Technical Skills

• ASP .NET Web API


• Authentication/Authorization (JWT, OIDC, claims)


• Blazor


• C# / .NET (Core, 10)


• Entity Framework Core


• MVC


• REST APIs


• REST, Swagger/OpenAPI


• SQL Server


• Testing (unit + integration)


• WCF

Language Proficiency

• Professional proficiency in English is required.


• Knowledge of French or Dutch is a plus.

Other Requirements

• Freelance position – 4 months duration, based in Brussels, Belgium (partial remote possible).


• Experience working in Agile/Scrum environments is advantageous.


• Ability to work both independently and as part of a multidisciplinary team.


• Strong documentation and communication skills.