Full Stack .NET Developer - Systems Expert (Freelance) - 7 months - Antwerpen, Belgium Where Builders Build the Future At RELYzIT Talent, we don’t recruit — we build. We unite the top 2% of builders — engineers, architects, creators — into a movement across Europe and the GCC. Vetted through our VECTOR7™ Signal Stack, you’re not just hired, you’re chosen. This is more than work. This is where builders build the future. About the Role Our client is seeking a Full Stack .NET Developer - Systems Expert for a 7-month freelance assignment in Antwerpen, Belgium. This is a mission-critical role for a builder who thrives on delivering robust, secure, and high-performing software solutions. You’ll be at the heart of transforming business processes and user experiences, ensuring that technology is not just a tool, but a catalyst for progress. Why This Role Matters As a Systems Expert, you will drive the renewal and optimization of core IT systems, directly impacting business continuity, data integrity, and user satisfaction. Your expertise will ensure that our client’s digital infrastructure is future-proof, secure, and ready to scale. The stakes are high: your work will empower teams, safeguard data, and enable rapid innovation. Key Responsibilities Design, develop, and maintain full stack applications using .NET and React within a microservices architecture Lead functional and technical analyses to align solutions with business and end-user needs Advise on technology choices, frameworks, and tooling to ensure optimal performance and scalability Implement APIs and microservices, ensuring seamless integration between frontend and backend Work in Agile teams using Azure DevOps for streamlined delivery and collaboration Utilize Git for version control and code management Monitor, test, and secure applications to guarantee reliability, security, and user-friendliness Perform unit and integration testing, applying best practices in application and API security Manage data structures and system settings using SQL Server, ensuring data quality and rapid recovery capabilities Debug and resolve frontend and backend issues, providing proactive second-line support Formulate proposals for architectural and development improvements, staying ahead of trends in .NET and React Document code, APIs, and architecture, sharing knowledge and maintaining structured documentation standards Technical Skills .NET (Intermediate) React (Intermediate) Redux (Intermediate) Zustand (Intermediate) Microservices (Intermediate) SQL Server (Intermediate) Azure DevOps (Intermediate) GIT (Intermediate) Application & API Security (Intermediate) Application Insights (Intermediate) Unit & Integration Testing (Intermediate) Agile working methodology (Intermediate) Language Proficiency Professional proficiency in English is required Other Requirements Medior profile: 2–3 years of relevant experience Bachelor’s degree or equivalent through experience Strong maturity, drive, and team fit Ability to start in August due to security clearance process On-site presence required in Antwerpen, Belgium (no remote work) Note: Collective closure from 14/07/2026 to 02/08/2026 VECTOR7™ Signal Stack: Elite Vetting Every builder we unite is rigorously vetted through our VECTOR7™ Signal Stack — ensuring you join a community where only the best build together. Ready to build the future? Upload your CV now and join the movement of elite builders with RELYzIT Talent. RELYzIT TechJobs FreelanceTalent Antwerpen DotNet React Microservices AzureDevOps SQLServer FullStack VECTOR7