Senior .NET Blazor Developer - Transport Sector - Brussels - Freelance / CDI

AlterSolutions

Brussels, Brussels, Belgium permanent

Posted: January 29, 2026

Required Skills

Job Description

• Location: Brussels Region (Hybrid: 2 days onsite/week)

Start date: 16/03/2026

End date: 29/02/2028

A Senior Full Stack Developer is required to support long-term application development within a large transport-sector organization. The role focuses on building and maintaining modern applications using Blazor, C#, .NET, Entity Framework, and SQL Server, ensuring high-quality deliverables and robust database integration.

Key Responsibilities

• Design, develop, and maintain full-stack applications using Blazor, C#, and Microsoft technologies.
• Build efficient and scalable backend components using .NET.
• Develop high-quality Blazor front-end interfaces (WASM or Server).
• Create, optimize, and maintain relational database structures using SQL Server.
• Work with ORMs such as Entity Framework, Linq2SQL, or Dapper.
• Ensure maintainability, code quality, performance, and security best practices.
• Collaborate with developers, analysts, and operational teams.
• Participate in code reviews, architecture discussions, and agile ceremonies.
• Support continuous improvement and modernization initiatives.
• Ensure compliance with internal processes and regulatory requirements.

Mandatory Skills & Experience

Technical Requirements

• Minimum 3+ years of hands-on development experience with Blazor.
• Minimum 5+ years of professional experience with C# / .NET.
• Minimum 5+ years of experience with Microsoft SQL Server.
• Minimum 5+ years working with ORMs such as:• Entity Framework
• Linq2SQL
• Dapper

• Minimum 8+ years working with Microsoft technologies.
• Experience in the public transport or infrastructure sector.

Availability & Presence

• Must be based in Belgium.
• Onsite presence: 2 days per week (mandatory).

Languages

• English: Professional proficiency (required).
• French or Dutch: Considered an asset.

Additional Information

• Candidates must have a valid work and residence permit for Belgium (if non-EU)
• The client values diversity and inclusion, offering a positive work culture focused on well-being
• Opportunity to contribute to innovative, ground-breaking technologies in the energy sector

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