Full Stack .NET Developer - Systems Expert

Full Stack .NET Developer - Systems Expert - 4 months - Antwerpen Belgium

At RELYzIT, we don't recruit — we build.

We unite exceptional builders: engineers, architects, creators, across the BENELUX and the GCC.

Vetted through VECTOR7™'s multi-signal evaluation, you evaluate once and carry that credential forever.

This is more than work. This is where builders build the future.

Intro

RELYzIT Talent is seeking a Full Stack .NET Developer - Systems Expert for a high-impact, on-site freelance assignment in Antwerpen, Belgium. This is your opportunity to join a community of elite builders, working on mission-critical systems that shape the digital backbone of our client’s business. If you thrive on ownership, innovation, and building solutions that matter, this is where your expertise will drive real outcomes.

Why This Role Matters

Our client is embarking on a strategic renewal of their IT landscape, with a focus on stability, performance, and security. As a Full Stack .NET Developer - Systems Expert, you will be instrumental in modernizing core applications and infrastructure, ensuring seamless business operations and an exceptional user experience. Your work will directly impact the reliability and future-readiness of the organization’s digital ecosystem.

What You’ll Be Doing

• Designing and developing robust full stack applications using .NET and React, ensuring seamless integration between frontend and backend systems.


• Driving the renewal and optimization of hardware and software components, performing both functional and technical analyses to meet evolving business and user needs.


• Advising on technology choices, frameworks, and tooling, with a focus on scalable microservices architecture.


• Implementing APIs and microservices, leveraging Azure DevOps for Agile delivery and Git for version control.


• Ensuring application and API security by applying best practices and conducting thorough unit and integration testing.


• Monitoring, maintaining, and optimizing IT infrastructure and software applications for high reliability, security, and user-friendliness.


• Managing data structures and system settings, supporting data integration and performance using SQL Server.


• Debugging and resolving frontend and backend issues, providing second-line support, and proactively preventing production incidents.


• Formulating proposals for architectural improvements and staying ahead of developments in the .NET and React ecosystems.


• Documenting code, APIs, and architecture, and sharing knowledge within the team to ensure continuity and excellence.

What We’re Looking For

• Ownership mindset: You take initiative, drive solutions, and deliver impact.


• Problem-solving skills: You thrive on tackling complex technical challenges and optimizing systems.


• Builder mentality: You’re passionate about creating, improving, and future-proofing digital products.


• Team fit: You collaborate effectively, share knowledge, and contribute to a high-performance culture.


• Experience: Medior level (approximately 2–3 years), with a Bachelor’s degree or equivalent through experience.

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

• On-site presence required in Antwerpen, Belgium (remote work is not available for this assignment).


• Freelance position with a fixed duration of 4 months.


• Collective closure from 14/07/2026 to 02/08/2026; project start date in August due to security authorization procedures.


• Commitment to structured documentation and knowledge sharing.

About RELYzIT Talent

RELYzIT Talent is dedicated to connecting elite tech professionals with roles that drive innovation and impact. Through our VECTOR7™ Signal Stack vetting process, you join a trusted network where your credentials are recognized and valued across the BENELUX and GCC. We are builder-first, not recruiter-first — and we’re looking for those who want to shape the future, not just fill a role.