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# Senior .Net Developer

- **Company:** Keystone Solutions
- **Location:** Brussel, Belgium
- **Experience:** Expert
- **Contract:** Temporary contract
- **Skills:** .NET Framework, User Authentication, C Sharp (Programming Language), Software Quality, Code Review, Data Integration, Entity Framework, Microsoft Software, Microsoft SQL Server, Model View Controller (MVC), OpenID, Performance Tuning, Swagger, JSON Web Token, Software Systems, Blazor, Web Api
- **Published:** August 20, 2026
- **Apply:** https://www.careerjet.be/jobad/be41c20ebceb40b8b28c09ae73a4e952b5

## About the Role

* Critical analysis and information integration skills;
 * Structured and solution-oriented thinking;
 * Ability to generate viable alternatives and draw relevant conclusions;
 * Technical leadership and collaborative spirit;
 * Resilience and adaptability to technical or contextual changes.

Language Skills:

 * Fluency in one of the two national languages: FR or NL (level C2*);
 * Very good level of English (level C1*)., If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at .
Duration: 14/09/2026 - 31/12/2026 4 months * (full time)
Skills required:

 * ASP .NET Web API - Level: Expert - Most recent: Any time
 * Authentication/Authorization (JWT, OIDC, claims) - Level: Confirmed - Most recent: Any time
 * Blazor - Level: Confirmed - Most recent: Any time
 * C# / .NET (Core, 10) - Level: Expert - Most recent: Any time
 * Entity Framework Core - Level: Expert - Most recent: Any time
 * MVC - Level: Confirmed - Most recent: Any time
 * REST, Swagger/OpenAPI - Level: Confirmed - Most recent: Any time
 * SQL Server - Level: Confirmed - Most recent: Any time
 * Testing (unit + integration) - Level: Confirmed - Most recent: Any time

## Description

As a Senior .NET Developer, you will play a key role in the design, development, and maintenance of robust software solutions based on Microsoft technologies. You will bring your technical expertise to ensure code quality, solution sustainability, and system performance. Additionally, you will serve as a technical mentor for other team members.
Responsibilities:

 * Actively participate in the development of software components in .NET (Framework and Core);
 * Design scalable technical solutions in collaboration with the architecture team;
 * Provide technical guidance to team members and foster a culture of excellence;
 * Conduct code reviews and ensure adherence to best development practices;
 * Analyze functional requirements with analysts and translate them into technical solutions;
 * Ensure the quality, performance, security, and maintainability of applications;
 * Participate in optimizing system performance;
 * Integrate and evaluate new technologies in line with business objectives.


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