About the Mission

SYSTEM EXPERT – FULL STACK .NET DEVELOPER
Purpose of the position
The position is responsible for developing, implementing and maintaining software applications within a .NET environment in order to guarantee a stable, high-performance and secure IT environment and thus optimally support business processes and user experience.
Result areas

Contribute to the renewal of hardware and/or software components and perform the necessary functional or technical analyzes with the aim of meeting the needs of end users and the company.

Manage and monitor technical needs within a .NET and microservices architecture
Advising on technology choices (.NET, React, tooling, frameworks)
Designing solutions with a focus on frontend (React) and backend integration

Developing or determining the technical requirements for, as well as implementing, new hardware or software and applications with the aim of providing a high-quality set of equipment and applications.

Developing full stack applications (.NET + React)
Working according to Agile methodology using Azure DevOps
Implementing APIs and microservices
Using Git for version control

Monitoring, maintaining, testing and securing the IT infrastructure and/or software applications with the aim of ensuring a high degree of reliability, security and user-friendliness for end users.

Perform unit and integration testing
Applying application & API security best practices
Monitoring performance and stability

Maintain data structures and/or system settings, provide a high-performance environment for data management and ensure backups of user files with the aim of ensuring the correctness of company data and being able to quickly restore it in the event of loss or damage.

Working with SQL Server for data management
Monitoring data quality and performance
Supporting data integration within microservices

Analyzing, solving and following up on application or network related problems with the aim of restoring the functioning of these applications or networks.

Debugging frontend and backend issues
Providing second-line support
Proactively avoid production problems

Formulating proposals for renewal and optimization of the activity domain with the aim of meeting current and future (business) needs.

Formulate improvements in architecture and development practices
Monitoring developments within the .NET and React ecosystem

Securing knowledge and keeping up-to-date data and documentation for your own expertise domain as well as communicating the information with the aim of maintaining a correct and complete picture of all available components and applications during the entire life cycle.

Documenting code, APIs and architecture
Sharing knowledge within the team
Working according to structured documentation standards

Profile

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

Please note: There is a collective closure from 14/07/2026 to 02/08/2026. Given the course of the selection procedure and the application for a security clearance/advice, the candidate will only be able to start in August.

Required Skills

.Net, Agile werkmethodiek, Application & API security, Application Insights, Azure DevOps, GIT, Microservices, React, Redux, SQL Server, Unit & integration testing, Zustand

Practical Information

  • Company: Confidential
  • Location: Dessel – On-site
  • Start Date: 10 June 2026
  • End Date: 31 December 2026
  • Duration: 7 months
  • Contract Type: Freelance / Mission
  • Application Deadline: 21 June 2026