Mission Overview:
Keystone Solutions is seeking a Senior Backend .NET Developer for a consultancy mission at a client site. In this role, you will be responsible for the development of core business applications, working on dynamic projects that offer a variety of challenges across different client environments.
Key Responsibilities:
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Understand and interpret UML and BPMN models.
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Manage and utilize SQL Server databases from version 2016 to 2025.
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Manage and utilize Oracle databases from version 19.
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Apply design patterns based on architect recommendations.
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Develop REST services using .NET Framework and .NET 8 and above.
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Develop interfaces in ASP.NET WebForms / MVC, .NET 4.5 and above.
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Work with XML and JSON.
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Utilize W3C standards.
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Work with WebAPI, WCF REST, WCF, and Web Services.
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Utilize Azure DevOps with GIT and TFVC.
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Practical knowledge of Redgate tools is a plus.
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Utilize Entity Framework Core.
Additional Skills Required:
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Ability to analyze functional requirements and translate them into technical solutions in collaboration with Scrum and solution architects.
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Ability to develop maintainable, high-performance code that adheres to team development standards.
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Experience in corrective and evolutionary maintenance of existing applications.
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Knowledge of SOLID principles and best practices in object-oriented development.
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Experience in writing and executing unit tests.
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Ability to diagnose and resolve technical incidents.
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Participate in code reviews and continuous improvement initiatives.
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Experience working in an Agile (Scrum) environment.
Expected Qualities:
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Autonomy in carrying out assigned developments.
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Analytical and problem-solving mindset.
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Ability to collaborate effectively with analysts, architects, and other developers.
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Strong communication skills and a team-oriented approach.
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Rigorous, proactive, and quality-oriented.
As a consultant at Keystone Solutions, you will experience turbo-charged learning and career growth opportunities while embodying our core values in every engagement. If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today .
Duration: 01/10/2026 - 31/12/2026 3 months • (full time)
Skills required:
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.Net - Level: Expert - Most recent: This year
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.NET Core - Level: Expert - Most recent: This year
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Agile - Level: Expert - Most recent: Any time
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ASP.NET - Level: Confirmed - Most recent: 1 to 3 years ago
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ASP.NET MVC - Level: Confirmed - Most recent: 1 to 3 years ago
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Azure DevOps - Level: Expert - Most recent: This year
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Entity Framework Core - Level: Expert - Most recent: This year
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GIT - Level: Expert - Most recent: 1 to 3 years ago
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JSON - Level: Expert - Most recent: This year
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RESTful API - Level: Expert - Most recent: 1 to 3 years ago
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Scrum - Level: Expert - Most recent: This year
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Soap API - Level: Nice to have - Most recent: Any time
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SOLID - Level: Expert - Most recent: This year
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Sprint - Level: Expert - Most recent: Any time
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UML - Level: Nice to have - Most recent: Any time
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Visual Studio - Level: Expert - Most recent: 1 to 3 years ago
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XML - Level: Expert - Most recent: Any time
Language requirements:
Dutch
Level Passive knowledge
English
Level Passive knowledge
French
Level Native
