Senior .NET Xamarin Developer - Transport Sector - ASAP start - Freelance / CDI

AlterSolutions

Brussels, Brussels, Belgium permanent

Posted: March 2, 2026

Job Description

We are looking for a senior developer who will take ownership of designing and building high‑quality, well‑tested software solutions within the Transport Execution Management domain.

You will work closely with solution designers and business stakeholders to translate ideas into effective, reliable applications, gaining a deep understanding of the business context. Beyond strong technical expertise, we are seeking someone who shows initiative, communicates clearly, contributes actively to the team, and is willing to go the extra mile when needed.

Mandatory:

• .NET development: 10+ years
• Azure Cloud development: 5+ years
• .NET Core Web API development: 5+ years
• Native .NET for Android (Xamarin): 5+ years
• Blazor: 1+ year
• React Native: 1+ year
• Professional expertise in unit testing
• Fluent in English (C2)
• Ability to work 20 days on site at the office (location: Brussels; schedule to be determined by the client)

Technical Expertise

• .NET development: Demonstrates deep mastery of the ecosystem, including language features, LINQ, async/await, security practices, and appropriate use of data structures and design patterns.
• Android development: Strong experience building complex native .NET/Xamarin Android applications, with mastery of the Android lifecycle and native bindings.
• Code quality & craftsmanship: Writes clean, maintainable, SOLID code aligned with best practices.
• Web API design & development: Designs secure and performant .NET Core Web APIs.
• Azure cloud: Uses Azure services, PaaS components, and event‑driven architectures effectively.
• Unit testing: Creates meaningful, maintainable, automated tests with high coverage and clear intent.
• CI/CD & DevOps: Experience setting up robust pipelines (Azure DevOps) and managing containerized deployments using Kubernetes and Docker.
• SQL & database design: Skilled in modeling, querying, and optimizing relational databases.
• Git & version control: Applies solid branching strategies and collaborates efficiently using Git.

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