Senior Xamarin Developer – .NET for Android

About the role

Keystone Solutions is looking for a senior .NET developer specialized in Android to join a consultancy mission for a client in the Transport Execution Management domain. You will work on‑site in Brussels, collaborating closely with the client’s solution designer and business stakeholders to deliver robust, maintainable applications.

Key responsibilities

• Design and implement high‑quality, well‑tested software solutions for transport execution management.
• Translate business ideas into reliable Android applications using Xamarin.Android.
• Collaborate with solution designers and stakeholders to ensure alignment with business needs.
• Take full ownership of delivering complete, production‑ready features.
• Contribute to team knowledge sharing and uphold professional standards.

Required profile

• More than 5 years of experience in .NET development.
• At least 3 years of hands‑on experience with Xamarin.Android (not limited to Xamarin.Forms or .NET MAUI).
• Proven experience with MvvmCross, unit testing, Clean Code, Clean Architecture and SOLID principles.
• Experience building CI/CD pipelines with Azure DevOps.
• Fluent in English and Dutch or French (C1/C2 level).
• Willingness to work a minimum of 2 days per week on‑site in Brussels.

Required skills

• .NET / C#
• Xamarin.Android
• MvvmCross
• Unit testing frameworks
• Clean Architecture & SOLID principles
• Azure DevOps (CI/CD pipelines)