Senior Azure .NET React Developer (Freelance – 2 days/week)
Location: Brussels, Belgium (Hybrid)
Industry: Railway Infrastructure (Public Sector)
Start Date: 15 October 2025
Duration: Until October 2026 (extendable, max. 24 months)
About the Role
A leading organization in the railway infrastructure sector is seeking a Senior Azure .NET React Developer to support the development and design of multiple applications and APIs on Microsoft Azure.
You will work closely with integration and product teams, collaborate with experienced developers and analysts, and provide technical design expertise while coaching junior developers.
Key Responsibilities
* Design and develop middleware solutions and products
* Participate in technical architecture & solution design
* Mentor and coach junior developers
* Collaborate with cross-functional teams on innovative digital solutions
Must-Have Skills
* Backend: .NET Core 9 / C# 13+
* Azure Services: Service Bus, Application Insights, Key Vault, Cosmos DB, Functions, App Services
* Frontend: React
* Architecture & Patterns: DDD, Microservices, CQRS, Event-Sourcing, SOLID
* Other Tools: OAuth 2.0, Postman, MS Dynamics 365
Soft Skills
* Motivated, autonomous, and flexible
* Strong team-player and proactive communicator
* Analytical and solution-oriented mindset
Requirements
* 10–14 years of relevant experience (Senior level)
* Bachelor’s degree in Computer Engineering (or equivalent)
* At least one recent Microsoft certification (< 2 years old)
* Fluency in Dutch, French & English