Senior .NET Developer: Architecting Scalable C# APIs

Rhox; Zwijnaarde; On-site; EUR 70,000 - 90,000; Full time

Job summary

Rhox in Belgium is seeking a senior developer to design and build C# services, APIs and web applications across a mixed technology stack. You will translate business requirements into technical designs, implement integrations, and help shape IT architecture while mentoring teammates.

Fluent Dutch is required with English at B2 and French as a plus. The role involves collaboration across teams, code reviews and contributing to migrations, performance improvements and system security.

Qualifications

• Experience with .NET 2022-2026, C#, VB.NET, ASP.NET and MVC.
• Web development: HTML, CSS, JavaScript, jQuery, AJAX, Next.js and PHP.
• Java and development tools: Visual Studio, VS Code, Eclipse, Android Studio.
• Databases: MS SQL Server and MySQL.
• Application servers: IIS, WebSphere, WildFly.
• Bachelor-level thinking and strong analytical skills.
• Experience with or interest in healthcare applications.
• Clear communication, teamwork and coordination.
• Dutch (native).
• English (B2).
• French (good working knowledge).

Responsibilities

• Translate business requirements into technical designs.
• Develop and maintain C# services and API integrations.
• Integrate new software into existing applications.
• Support application, domain and infrastructure migrations.
• Improve application performance, security and scalability.
• Contribute to future IT architecture.

Skills

Dutch (native)

English (B2)

French (working)

Tools

Visual Studio

VS Code

Eclipse

Android Studio

MS SQL Server

MySQL

IIS

WebSphere

WildFly

Next.js

PHP

Java

JavaScript

jQuery

AJAX

HTML

CSS

Job description

Rhox in Belgium is seeking a senior developer to design and build C# services, APIs and web applications across a mixed technology stack. You will translate business requirements into technical designs, implement integrations, and help shape IT architecture while mentoring teammates.

Fluent Dutch is required with English at B2 and French as a plus. The role involves collaboration across teams, code reviews and contributing to migrations, performance improvements and system security.