Senior Backend .NET Developer

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:

• Understand and interpret UML and BPMN models.


• Manage and utilize SQL Server databases from version 2016 to 2025\.


• Manage and utilize Oracle databases from version 19\.


• Apply design patterns based on architect recommendations.


• Develop REST services using .NET Framework and .NET 8 and above.


• Develop interfaces in ASP.NET WebForms / MVC, .NET 4\.5 and above.


• Work with XML and JSON.


• Utilize W3C standards.


• Work with WebAPI, WCF REST, WCF, and Web Services.


• Utilize Azure DevOps with GIT and TFVC.


• Practical knowledge of Redgate tools is a plus.


• Utilize Entity Framework Core.

Additional Skills Required:

• Ability to analyze functional requirements and translate them into technical solutions in collaboration with Scrum and solution architects.


• Ability to develop maintainable, high\-performance code that adheres to team development standards.


• Experience in corrective and evolutionary maintenance of existing applications.


• Knowledge of SOLID principles and best practices in object\-oriented development.


• Experience in writing and executing unit tests.


• Ability to diagnose and resolve technical incidents.


• Participate in code reviews and continuous improvement initiatives.


• Experience working in an Agile (Scrum) environment.

Expected Qualities:

• Autonomy in carrying out assigned developments.


• Analytical and problem\-solving mindset.


• Ability to collaborate effectively with analysts, architects, and other developers.


• Strong communication skills and a team\-oriented approach.


• 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:

• .Net \- Level: Expert \- Most recent: This year


• .NET Core \- Level: Expert \- Most recent: This year


• Agile \- Level: Expert \- Most recent: Any time


• ASP.NET \- Level: Confirmed \- Most recent: 1 to 3 years ago


• ASP.NET MVC \- Level: Confirmed \- Most recent: 1 to 3 years ago


• Azure DevOps \- Level: Expert \- Most recent: This year


• Entity Framework Core \- Level: Expert \- Most recent: This year


• GIT \- Level: Expert \- Most recent: 1 to 3 years ago


• JSON \- Level: Expert \- Most recent: This year


• RESTful API \- Level: Expert \- Most recent: 1 to 3 years ago


• Scrum \- Level: Expert \- Most recent: This year


• Soap API \- Level: Nice to have \- Most recent: Any time


• SOLID \- Level: Expert \- Most recent: This year


• Sprint \- Level: Expert \- Most recent: Any time


• UML \- Level: Nice to have \- Most recent: Any time


• Visual Studio \- Level: Expert \- Most recent: 1 to 3 years ago


• XML \- Level: Expert \- Most recent: Any time

Language requirements:

Dutch

Level Passive knowledge

English

Level Passive knowledge

French

Level Native

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