Software Developer - Backend / Full-stack(f/m/d)

We are a Japanese-owned IT vendor based in Düsseldorf, Germany, providing dedicated IT services to our group companies across Europe — including sales, wholesale, and manufacturing entities. Our team develops and maintains the digital infrastructure that keeps these businesses running: ERP interface applications, a proprietary Warehouse Management System (WMS), and a fully custom-built ERP solution for our manufacturing subsidiary.

We are looking for a Mid-level Software Developer (Backend / Full-stack) to join our team in Düsseldorf. You will design, develop, and support business-critical applications in close collaboration with internal stakeholders and end users across multiple European sites. Depending on project needs, occasional on-site visits to group companies within Europe may be required.

- Develop and maintain interface applications for the commercial ERP system (SAGE 300) - Design and build a Warehouse Management System (WMS) integrated with ERP workflows - Contribute to the development of a proprietary ERP system used by our manufacturing subsidiary - Write clean, maintainable .NET code for Windows Server environments - Design and optimize database schemas and queries in Oracle and MS SQL Server - Work with group companies to gather requirements and deliver solutions that fit their operational needs - Travel within Europe on an as-needed basis for requirements workshops or go-live support

- 3–5 years of professional experience in backend or full-stack development - Proficiency in .NET (C# preferred) for Windows-based application development - Solid hands-on knowledge of relational databases: Oracle and/or MS SQL Server (schema design, stored procedures, performance tuning) - Experience working in Windows Server environments - Business-level English AND Japanese (both required for daily team communication) - Ability to work independently and communicate clearly with non-technical stakeholders - Willingness to travel within Europe when required

- Experience with SAGE 300 or similar commercial ERP platforms - Background supporting multi-entity or multi-site organizations

Apply online or feel free to contact me directly for more information about this opportunity.