Senior .NET Architect — Hands-On Modernization (Hybrid, Freelance)

Inetum; Brussel; Hybrid; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Hybrid work environment

3 days onsite

Long-term assignment

Job summary

Inetum in Belgium (Brussels region) seeks a Senior .NET Technical Developer with a strong architectural background who enjoys hands-on development. You will shape the evolution of a large-scale internal platform, driving modernization and architectural improvements while remaining actively involved in coding.

You will collaborate with business stakeholders and development teams, lead refactoring efforts, and ensure secure, high-performance solutions within a complex legacy environment.

Qualifications

• Senior .NET developer with strong architectural background.
• 10+ years in Microsoft development environments.
• Proven modernization and migration project experience.
• Strong knowledge of C#, .NET, and ASP.NET MVC.
• Experience with REST APIs, SQL Server, and legacy systems.
• Excellent communication with technical and business stakeholders.

Responsibilities

• Hands-on development within a .NET environment.
• Analyze and improve existing architecture.
• Lead refactoring initiatives to reduce technical debt.
• Identify and resolve performance and security issues.
• Advise on technical decisions and modernization efforts.
• Design future-proof solutions within current infrastructure.
• Guide technical stakeholders and collaborate with business teams.
• Contribute to migration and continuous improvement programs.

Skills

C# & .NET

ASP.NET MVC

REST APIs

SQL Server

Architecture leadership

Legacy modernization

Stakeholder management

English (written/spoken)

Dutch (written/spoken)

Tools

Azure

IIS hosting

WCF

ETL/Integration

Job description

Inetum in Belgium (Brussels region) seeks a Senior .NET Technical Developer with a strong architectural background who enjoys hands-on development. You will shape the evolution of a large-scale internal platform, driving modernization and architectural improvements while remaining actively involved in coding.

You will collaborate with business stakeholders and development teams, lead refactoring efforts, and ensure secure, high-performance solutions within a complex legacy environment.