Senior .NET Developer - Dutch

ATS4IT supports its clients in their digital transformation initiatives and AI driven innovations, in different sectors and it's a part MoOngy Group, with over 9,500 employees across Europe, we bring extensive expertise across a wide range of IT domains. With teams in Belgium, Denmark, and a nearshore center in Portugal, we deliver proximity, agility, and real impact across Europe.

Senior .Net Developer - Dutch

Location: Brussels 
Languages: Fluent Dutch and English
Eligibility: A valid EU work permit is mandatory

About the Role

We are looking for an experienced Senior .NET Developer to join a dynamic team delivering modern enterprise applications and digital services. You will play a key role in designing, developing, and maintaining scalable solutions based on microservices architecture while contributing to the evolution of cloud-native platforms in Azure.

The ideal candidate combines strong backend expertise in .NET technologies with modern frontend development experience and a solid understanding of software architecture, security, and DevOps practices.

Profile

• Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field.
• Minimum 5 years of experience in .NET software development.
• Strong analytical and problem-solving skills.
• Experience working in Agile development environments.
• Excellent communication and collaboration skills.
• Passion for clean code, software quality, and continuous improvement.

Requirements

Mandatory

• Strong experience with C#, .NET, ASP.NET, and Entity Framework .
• Hands-on experience designing and developing Microservices architectures.
• Good knowledge of Domain-Driven Design (DDD) principles.
• Experience with Unit Testing and software quality practices.
• Experience with Azure DevOps and CI/CD pipelines.
• Knowledge of Azure Data Factory and Azure API Management .
• Experience implementing Federated Authentication using SAML and OAuth .
• Experience with Docker and containerized applications.
• Knowledge of SQL Server and/or PostgreSQL databases.
• Experience integrating and maintaining REST APIs and service-oriented architectures.
• Strong troubleshooting and debugging skills.

Strongly Preferred

• Experience with Blazor or Angular for frontend development.
• Experience working with Azure Cloud Services .
• Knowledge of secure application development and API security.
• Experience with distributed systems and event-driven architectures.
• Familiarity with monitoring and observability tools.
• Experience participating in architecture and technical design discussions.

Nice to Have

• Experience with WCF and legacy system integrations.
• Knowledge of Kubernetes or container orchestration platforms.
• Experience with Infrastructure-as-Code and automation tools.
• Experience migrating monolithic applications to microservices.
• Microsoft Azure certifications.

Key Responsibilities

• Design, develop, and maintain enterprise-grade applications using .NET technologies.
• Build and enhance scalable microservices-based solutions .
• Develop and maintain REST APIs and integrations.
• Collaborate with architects, analysts, and business stakeholders to define technical solutions.
• Ensure software quality through automated testing and code reviews.
• Manage deployments and CI/CD processes through Azure DevOps.
• Implement secure authentication and authorization mechanisms.
• Optimize application performance and database interactions.
• Contribute to technical decisions, best practices, and coding standards.
• Support production environments and troubleshoot complex technical issues.

Technical Environment

• .NET / C#
• ASP.NET
• Entity Framework
• Microservices
• Domain-Driven Design (DDD)
• Azure DevOps
• Azure Data Factory
• Azure API Management
• SAML / OAuth
• Docker
• Blazor or Angular
• SQL Server / PostgreSQL
• WCF

What We Offer

• Permanent Contract (CDI) – Long-term stability.
• Attractive salary based on your experience and skills.
• Additional benefits: Meal vouchers and eco-vouchers (electronic), DKV hospitalization insurance, company laptop, holiday allowance, and year-end bonus.
• Free training (technical, behavioral, language) and certifications.
• Continuous and personalized career progression support.
• Opportunities to work on projects with cutting-edge technologies.

At Moongy Group, we stand for equality and diversity. We create a safe and inclusive environment where opportunities are equal for everyone! We do not discriminate based on age, ethnicity, gender, disability, sexual orientation, or any factor other than merit. If you have the skills for the role, we encourage you to apply!