Backend Developer – .NET & ASP.NET Core

Responsibilities

• Develop and maintain backend functionalities using C# and ASP.NET Core within a modular architecture.
• Design, build, and maintain REST APIs and ensure consistent data delivery via JSON.
• Manage data models and processing using Entity Framework Core and MSSQL.
• Write and maintain unit and integration tests to ensure software quality and stability.
• Collaborate with frontend developers on API contracts, data validation, and error handling.
• Implement secure software development practices based on OWASP guidelines.
• Document technical choices, code, and API specifications for long-term maintainability.

Requirements

• 3+ years of experience in backend development using C#, .NET, and ASP.NET Core.
• 3+ years of experience in designing, developing, and consuming REST APIs.
• Experience with Entity Framework Core and relational databases such as MSSQL.
• Practical knowledge of testing and quality through unit testing and integration testing.
• Solid experience with version control using Git.
• In-depth understanding of modular architecture and the separation between shared and domain-specific code.
• Knowledge of security principles including OWASP guidelines and input validation.
• Experience working with Agile methodologies.
• You're able to independently analyze technical problems and provide maintainable solutions.
• You are native in Dutch.

Nice to Haves

• Experience with Elasticsearch and Elastic APM for tracing and monitoring.
• Knowledge of background processing and task scheduling using Hangfire.
• Familiarity with DevOps and containerization tools such as GitLab CI/CD, Docker, and Kubernetes.
• Basic knowledge of Vue.js to facilitate collaboration with frontend teams.