.NET Developer

Job Description .NET Developer (Senior, Viewport Team) About Assai Software. Assai Software develops enterprise-grade document and information management solutions for large-scale engineering and infrastructure projects. Its platform helps clients manage complex technical documentation with advanced workflow, control, and compliance capabilities. Following the acquisition of Viewport.ai, Assai is integrating intelligent search and visualization into its ecosystem. Viewport interprets engineering drawings, maintenance records, and technical documents from multiple sources, providing users with context-aware access to information across the full asset lifecycle. The Role Assai is looking for a .NET Developer to strengthen the Viewport development team. You will work on backend services that power semantic search, contextual linking, and visualization of engineering data. Together with the new Product Owner and Technical Lead, you will help shape the integration of Viewport into the Assai platform. Key Responsibilities Design, develop, and maintain backend components using .NET and C#. Work on APIs and services that connect Viewport to Assai’s document management system. Collaborate with the Product Owner, Tech Lead, and other engineers to translate requirements into scalable solutions. Implement and improve data processing, indexing, and visualization logic for large technical document sets. Participate in Agile sprints, code reviews, and continuous improvement efforts. Skills & Experience 8+ years of experience in .NET development (.NET Core, .NET Framework, ASP.NET Core). Good understanding of object-oriented programming, software design principles, and clean code practices. Experience working with REST APIs, Entity Framework Core, Docker, Git and PostgreSQL. Basic familiarity with front-end technologies (HTML/CSS/JavaScript/React) is a plus. Experience with NHibernate, Dapper, unit/integration testing, SAML, GitHub Actions, Kubernetes, Helm Charts, Terraform, Open API, Open Telemetry, IIS is a plus. Exposure to Agile development methodologies (Scrum preferred). Understanding of version control (Git), unit testing, and CI/CD tools. Bachelor’s degree in Computer Science, Software Engineering, or related discipline. Willingness to learn, take initiative, and work collaboratively in a team setting. What Assai Offers Salary between €60.000 and €85.000 gross per year, depending on experience. Hybrid working model (Culemborg / Amsterdam office + remote days). International environment with growth opportunities. Technically driven culture focused on quality and innovation. Direct impact on an evolving AI-driven SaaS platform used by global engineering leaders.