Senior .NET Developer-ZAS000148

ITproposal; Brussel; Hybride; EUR 70 000 - 95 000; Plein temps

Résumé du poste

ITproposal in Belgium (hybrid) seeks a Senior .NET Developer to join a software team responsible for enterprise applications on the Microsoft stack. You will analyze, develop, test, document, and support systems while collaborating with architects, analysts, and other teams to deliver scalable solutions.

The ideal candidate has 7+ years in .NET, strong C#, REST APIs, SQL and data modelling, and Dutch CEFR C2. You will mentor peers and apply Agile practices to ensure high-quality delivery.

Qualifications

• At least 7 years of .NET development experience with strong C# skills.
• Extensive .NET/ASP.NET, REST API, and SQL experience.
• Dutch language proficiency at CEFR C2 level; able to mentor others.

Responsabilités

• Design, develop, test, debug, and maintain enterprise .NET apps.
• Develop and maintain RESTful APIs and integrations.
• Write and optimize complex SQL queries and data models.
• Work with relational databases ensuring performance and integrity.
• Participate in analysis, documentation, and production support.
• Coach and mentor developers; contribute to technical leadership.
• Apply Agile practices across the software lifecycle.
• Collaborate with cross-functional teams to deliver quality solutions.
• Ensure code quality through testing and best practices.

Connaissances

C#

.NET/ASP.NET

REST APIs

SQL

Data modelling

Dutch C2

Agile

Mentoring

Description du poste

About The Job Senior .NET Developer-ZAS000148Senior .NET Developer

Location: Belgium (Hybrid)

Start Date: 01 September 2026

Contract Duration: Until 31 December 2026 (extension possible)

Workload: Full-time

Job Overview

We are looking for an experienced Senior .NET Developer to join a software development team responsible for the analysis, development, testing, documentation, and support of enterprise applications and system integrations built on the Microsoft technology stack. The successful candidate will have a strong background in .NET development, be capable of working independently, and collaborate effectively with architects, analysts, infrastructure teams, application administrators, and fellow developers to deliver scalable and maintainable software solutions.

Key Responsibilities

• Design, develop, test, debug, and maintain enterprise .NET applications.
• Develop and maintain RESTful APIs and application integrations.
• Write, analyze, and optimize complex SQL queries.
• Work with relational databases, ensuring high performance and data integrity.
• Participate in application analysis, technical documentation, and production support.
• Coach and mentor developers while contributing to technical leadership within the team.
• Apply Agile development practices throughout the software development lifecycle.
• Collaborate with cross-functional technical teams to deliver high-quality solutions.
• Ensure code quality through testing, debugging, and best development practices.

Required Skills & Experience

• Minimum 7 years of .NET development experience.
• Minimum 5 years of experience developing .NET-based applications.
• Strong expertise in:
  • C#
  • .NET / ASP.NET
  • RESTful API development
  • SQL query development and optimization
  • Relational databases
• Experience with software development, testing, debugging, and troubleshooting.
• Experience leading or mentoring development teams.
• Strong knowledge of Agile software development methodologies.
• Dutch language proficiency at CEFR C2 level.

Preferred Skills

• Knowledge of authentication and authorization technologies such as:
  • OAuth 2.0
  • OpenID Connect
  • JWT
• Understanding of:
  • Data modelling
  • Indexes
  • Views
  • Stored Procedures
• Knowledge of software architecture principles and design patterns.
• Experience with modern component-based UI development.
• Understanding of API design principles, HTTP methods, status codes, and JSON.
• Knowledge of Microsoft SQL Server.
• Familiarity with HTML5, CSS3, and JavaScript.
• Experience with CI/CD principles.
• Experience within the healthcare sector is an advantage.