About the Mission

VERSION FR Function As a Senior .NET Developer, you play a key role in the design, development and maintenance of robust software solutions based on Microsoft technologies. You bring your technical expertise to guarantee the quality of the code, the sustainability of the solutions and the performance of the systems. You are also a technical mentor to other team members. Responsibilities Actively participate in the development of software components in .NET (Framework and Core); Design scalable technical solutions in collaboration with the architecture team; Technically supervise team members and foster a culture of excellence; Carry out code reviews and ensure compliance with good development practices; Analyze functional needs with analysts and translate them into technical solutions; Ensure the quality, performance, security and maintainability of applications; Participate in optimizing system performance; Integrate and evaluate new technologies in line with business objectives. Behavioral skills Ability to critically analyze and integrate information; Structured and solution-oriented thinking; Ability to generate viable alternatives and draw relevant conclusions; Technical leadership and collaborative spirit; Resilience and adaptability in the face of technical or contextual changes. We offer you an interesting job in providing ICT and Data services that have an impact on society, with many advantages: A good balance between professional and private life; Flexible schedule in the provision of 40 hours per week (7:30 a.m. to 8 p.m. with fixed times between 9 a.m. and 12 p.m. and 1 p.m. and 4 p.m.); Possibility of teleworking; Workspaces organized according to activities; Easy accessibility via public transport; Car and bicycle parking in the building; Individual locker; Company restaurant; Several possibilities for self-development: Training and learning opportunities (to be followed outside of working hours) via our e-academy self-learning platform or via the Microsoft Enterprise Skills Initiative platform. ____________ NL VERSIE Functie Als Senior .NET Developer speel je een sleutelrol bij het wentwerpen, ontwikkelen en onderhouden de robuste software oplossingen op la base de Microsoft technologiesën. I provide technical expertise, guarantee code knowledge and support the technical mentor of your team. Verantwoordelijkheden Actief deelnemen aan dentwikkeling van software components in .NET (Framework en Core); Ontwerpen van schaalbare en onderhoudbare oplossingen en samenwerking met de architectuurteam; Technical coaching involves a team led by an excellent culture; Use code reviews and find out about best practices; Analyze the functions being performed and analyzed in technical operation; Zorgen voor de kwaliteit, services, beveiliging en onderhoudbaarheid van toepassingen; Optimize your system requirements; Evaluate the integration of new technologies that pass through bedrijfsdoelstellingen. Gedragsvaardigheden Kritische informatieanalyse en integratie; Gestructureerd en oplossingsgericht denken; Creatief in het bedenken van alternatieven en het trekken van juiste conclusions; Technisch leiderschap en samenwerking; Verkracht en aanpassingsvermogen aan technische de contextuele veranderingen. We have found an interesting role in ICT and Data services that has a significant impact on the subject, but you can do it privately; Flexible working hours of 40 hours per week (7.30 to 20.00 and extended periods from 9.00 to 12.00 to 13.00 to 16.00); De mogelijkheid tot telewerken; Werkplekken georganiseerd volgens activiteiten; Goedeikbaarheid met het openbaar vervoer; Parking for your car’s bike in the park; Individual kluis

Required Skills

ASP.NET Core Web API, Authentication/Authorization (JWT, OIDC, claims), Blazor, C# / .NET (Core, 10), Entity Framework Core, MVC, REST API’s, REST, Swagger/OpenAPI, SQL Server, Testing (unit + integration)

Practical Information

  • Company: Confidential
  • Location: Brussel – Hybrid
  • Start Date: 18 May 2026
  • End Date: 31 December 2026
  • Duration: 8 months
  • Contract Type: Freelance / Mission
  • Application Deadline: 5 May 2026