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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Medior Backend .NET Developer - **Company:** Keystone Solutions - **Location:** Brussel, Belgium - **Experience:** Experienced - **Contract:** Temporary contract - **Skills:** ASP.NET, .NET Framework, Agile Methodology, Unit Testing, Microsoft Azure, Business Process Model and Notation, Software Design Patterns, Entity Framework, Windows Communication Foundation, JSON, Microsoft Visual Studio, Microsoft SQL Server, Model View Controller (MVC), Object-Oriented Software Development, Oracle Databases, Scrum Methodology, UML, Web Services, Extensible Markup Language (XML), Wcf Rest, Backend, Git, Solid Principles, Webforms, Redgate, Restful APIs, Web Api - **Published:** September 29, 2026 - **Apply:** https://www.adzuna.be/details/5902634067 ## About the Role * 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. * 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. * Good communication skills and a sense of teamwork. * Rigorous, proactive, and quality-oriented. Language Requirement: The service in which the person will be integrated is predominantly French-speaking. Therefore, it is essential that the candidate is fluent in French. If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal., * Entity Framework Core - Level: Confirmed - Most recent: Any time * GIT - Level: Confirmed - Most recent: 1 to 3 years ago * JSON - Level: Confirmed - Most recent: This year * RESTful API - Level: Confirmed - Most recent: 1 to 3 years ago * Scrum - Level: Confirmed - Most recent: This year * Soap API - Level: Nice to have - Most recent: Any time * SOLID - Level: Confirmed - Most recent: Any time * Sprint - Level: Confirmed - Most recent: Any time * UML - Level: Nice to have - Most recent: Any time * Visual Studio - Level: Confirmed - Most recent: 1 to 3 years ago * XML - Level: Confirmed - Most recent: Any time ## Description * Understand and interpret UML and BPMN models. * Know, use, and manage SQL Server databases from version 2016 to 2025. * Know, use, and manage an ORACLE database 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. * Develop in XML and JSON. * Know and use W3C standards. * Know and use WebAPI, WCF REST, WCF, and Web Services. * Know and use Azure DevOps with GIT and TFVC. * Practical knowledge of Redgate tools is a plus. * Know and use Entity Framework Core. ## Related Videos - [Navigating the Corporate Jungle: Life as a Developer in a large Company](https://www.wearedevelopers.com/videos/621-navigating-the-corporate-jungle-life-as-a-developer-in-a-large-company) - [Tips and Tricks for Working with JSON](https://www.wearedevelopers.com/videos/1229-tips-and-tricks-for-working-with-json) - [ChatGPT and Java: A Match Made in Heaven or Hell?](https://www.wearedevelopers.com/videos/536-chatgpt-and-java-a-match-made-in-heaven-or-hell) - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [Introducing JSON Structure](https://www.wearedevelopers.com/videos/100219-introducing-json-structure) - [Beyond UML: Making Sense of AI-Generated Code through Visual Architecture](https://www.wearedevelopers.com/videos/2102-beyond-uml-making-sense-of-ai-generated-code-through-visual-architecture) ## Related Articles - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [Where to Find Entry-Level Software Engineering Jobs](https://www.wearedevelopers.com/magazine/397-where-to-find-entry-level-software-engineering-jobs) - [The 7 Most Popular Backend Frameworks for Developers](https://www.wearedevelopers.com/magazine/403-the-7-most-popular-backend-frameworks-for-developers) - [The Most Popular IT Jobs on the Market](https://www.wearedevelopers.com/magazine/376-the-most-popular-it-jobs-on-the-market) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers)