Senior .Net Developer

Keystone Solutions; Brussel Hoofdstad; Sur place; EUR 67 000 - 100 000; Plein temps

Résumé du poste

Keystone Solutions is seeking a Senior .NET Developer to design, develop, and maintain robust software solutions based on Microsoft technologies for a client site in Belgium. You will contribute to architecture discussions, ensure code quality, and mentor junior team members.

The role focuses on .NET Framework and .NET Core, Blazor, EF Core, and REST APIs, with emphasis on performance, security, and maintainability, while collaborating with an architecture team to deliver scalable solutions.

Qualifications

• Expert in ASP.NET Web API, C#/.NET Core, and EF Core with strong architecture skills.
• Experience with Blazor, MVC, REST APIs, and SQL Server; proficient in unit and integration testing.
• Ability to lead technical discussions, review code, and translate requirements into scalable solutions.

Responsabilités

• Actively participate in the design, development, and maintenance of .NET software components.
• Design scalable technical solutions in collaboration with the architecture team.
• Provide technical guidance to team members and conduct code reviews.
• Analyze requirements and translate them into technical implementations.
• Ensure quality, performance, security, and maintainability of applications.
• Participate in optimizing system performance and evaluating new technologies.

Connaissances

ASP .NET Web API

Authentication/Authorization (JWT, OID

Blazor

C# / .NET (Core, 10)

Entity Framework Core

MVC

REST, Swagger/OpenAPI

SQL Server

Testing (unit + integration)

Outils

Microsoft technologies

Description du poste

Mission Overview:

We are seeking a team to successfully execute a migration project for several essential information tools that support the business processes of the Compensation Service, with the aim of modernizing and improving service continuity. This position is a consultancy mission at a client site representing Keystone Solutions.

Function:

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.

Behavioral Skills:

• 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*).

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

Language requirements:

Dutch
Level Active knowledge
English
Level Passive knowledge
French
Level Active knowledge