Senior .NET Developer (Blazor UI)

Location: Brussels, Belgium

Company

hirify.global is a growing Belgian SME delivering digital-services solutions in a public-sector environment.

What you will do

• Design, develop, integrate and maintain secure, accessible and responsive business applications using C#, modern .NET, Blazor, Razor components and ASP.NET Core Web APIs.
• Provide technical direction for Blazor UI architecture, reusable components, shared libraries, design-system integration and consistent engineering practices.
• Integrate applications with REST APIs and JSON services, implement authentication and authorisation flows, and extend APIs when required.
• Build WCAG 2.1 AA-compliant interfaces with semantic HTML and modern CSS, ensuring responsive behaviour, usability and browser compatibility.
• Maintain quality through code reviews, refactoring, SonarQube, automated testing, CI/CD and performance diagnostics across Azure environments.
• Coach developers, collaborate with analysts, architects, UX, security, platform and operations teams, and lead complex end-to-end issue resolution.

Requirements

• Senior, autonomous hands-on experience delivering complex applications from requirements through production support, with technical leadership and mentoring capability.
• C# with 8 years of experience and modern .NET / ASP.NET Core with 6 years of experience.
• Blazor and Razor components, including Blazor Web App render modes, with 3 years of experience.
• HTML, CSS and responsive design with 6 years of experience; web accessibility and WCAG 2.1 AA with 3 years of experience.
• REST APIs and JSON exchanges with 6 years of experience.
• OAuth 2.0, OpenID Connect, JWT and claims-based authorisation with 5 years of experience.
• Entity Framework Core and SQL with 5 years of experience.
• Unit, component, integration and UI automation testing with 6 years of experience.
• Git, Azure DevOps and CI/CD pipelines with 6 years of experience; Agile / Scrum with 8 years of experience.
• At least 1 year of professional experience with AI-assisted development using GitHub Copilot, Claude Code or a similar tool.
• Mastery of French or Dutch and professional proficiency in English are required. Passive understanding of the second national language is an asset.

Nice to have

• Microsoft Azure with 3 years of experience.
• .NET Framework maintenance with 2 years of experience.
• Azure Service Bus / NServiceBus with 2 years of experience.
• JavaScript / TypeScript and JavaScript-Blazor interoperability with 2 years of experience.
• Playwright, SharePoint or legal document stores with WORM requirements.

Culture & Benefits

• Growing Belgian SME environment encouraging initiative and personal development.
• Career planning with support for extra education and certification, including a dedicated budget.
• Attractive salary with extra-legal benefits, including a company car.
• Freelance or permanent engagement is possible.