Senior .NET Web Developer

About the role

We are seeking a Senior .NET Web Developer to join a leading international organisation that operates in a highly secure, multinational environment. You will help design, build and maintain enterprise‑grade web applications that are secure, scalable and have long‑term impact.

Key responsibilities

• Design, develop and maintain modern web applications throughout the full software development lifecycle.
• Build robust backend services using .NET and Entity Framework Core.
• Develop modern frontend experiences with JavaScript and Svelte/SvelteKit.
• Create and consume REST APIs to integrate with enterprise systems and identity services.
• Contribute to architecture, application security, performance and scalability improvements.
• Work within CI/CD environments and support cloud‑ready deployments.

Required profile

• Strong experience developing enterprise web applications with modern .NET technologies.
• Solid knowledge of .NET (current LTS), Entity Framework Core, REST API design, SQL Server, JavaScript and Svelte/SvelteKit.
• Experience with secure software development practices.
• Familiarity with CI/CD pipelines, monitoring and application lifecycle management.
• Proficiency with Git and modern development tooling.
• Excellent English communication skills.
• Nice to have: cloud deployment experience, identity/authentication knowledge, French language skills, and background in regulated sectors.

Required skills

• .NET (current LTS)
• Entity Framework Core
• REST API design and integration
• SQL Server
• JavaScript
• Svelte / SvelteKit
• CI/CD pipelines
• Git
• Secure software development practices

What we offer

• Meaningful projects with real‑world impact.
• Modern technology stack with both backend and frontend ownership.
• International and collaborative environment.
• Flexible working model: Brussels office (hybrid) or remote within Europe.
• Long‑term projects focused on quality, security and innovation.