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 correctness 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 while communicating 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.
- Roles
- Medior Full\-Stack DeveloperMost recent experience This year
- Skills
- .Net
- Agile werkmethodiek
- Application \& API security
- Application Insights
- Azure DevOps
- GIT
- Microservices
- React
- Redux
- SQL Server
- Unit \& integration testing
- Zustand
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 'K\-Stone' means bringing our core values to every engagement, ensuring a fulfilling and impactful consultancy experience.
If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today .
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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