Full Stack .NET Developer Consultant

Mission Overview:

We are seeking a Full Stack .NET Developer for a consultancy mission at a client site, representing Keystone Solutions. The role involves developing, implementing, and maintaining software applications within a .NET environment to ensure a stable, high-performance, and secure IT environment that optimally supports business processes and user experience.

Key Responsibilities:

• Contribute to the renewal of hardware and/or software components and perform necessary functional or technical analyses to meet the needs of end-users and the company.
• Manage and follow up on technical needs within a .NET and microservices architecture.
• Advise on technology choices (.NET, React, tooling, frameworks).
• Design solutions focusing on frontend (React) and backend integration.
• Develop or determine technical requirements for, as well as implement, new hardware or software and applications to provide a quality set of equipment and applications.
• Develop full stack applications (.NET + React).
• Work according to Agile methodology using Azure DevOps.
• Implement APIs and microservices.
• Use Git for version control.
• Monitor, maintain, test, and secure the IT infrastructure and/or software applications to ensure a high degree of reliability, security, and user-friendliness for end-users.
• Perform unit and integration testing.
• Apply application & API security best practices.
• Ensure performance and stability.
• Maintain data structures and/or system settings, providing a performant environment for data management and ensuring backups of user files to guarantee the accuracy of business data and quick recovery in case of loss or damage.
• Work with SQL Server for data management.
• Monitor data quality and performance.
• Support data integration within microservices.
• Analyze, resolve, and follow up on application or network-related issues to restore the operation of these applications or networks.
• Debug frontend and backend issues.
• Provide second-line support.
• Proactively avoid production issues.
• Formulate proposals for renewal and optimization of the activity domain to meet current and future business needs.
• Propose improvements in architecture and development practices.
• Keep up with developments within the .NET and React ecosystem.
• Ensure knowledge retention and keep data and documentation up to date for the own area of expertise, as well as communicate information to maintain a correct and complete view of all available components and applications throughout their lifecycle.
• Document code, APIs, and architecture.
• Share knowledge within the team.
• Work according to structured documentation standards.

Profile:

Medior profile (approximately 2-3 years of experience). Bachelor’s degree or equivalent through experience. Strong in maturity, drive, and team fit.

Why Join Keystone Solutions:

As a consultant at Keystone Solutions, you will engage in dynamic projects that offer diverse challenges across various client environments. You will experience turbo-charged learning opportunities and have the chance to skyrocket your ambition and career growth. Being a

If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal .

Duration: 10/06/2026 - 31/12/2026 7 months • (full time)

Language requirements:

Dutch or French
Level Native or bilingual proficiency

Screening questions:

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