What you work on today shapes where you’ll be tomorrow. Looking for your next challenge as a Fullstack Developer (.NET, React)? We may have the right opportunity for you. At B3, we start with people and their experience. We match projects to your skills and professional growth path. Our consultants work across a wide range of industries and technologies, delivering IT projects both in Poland and internationally. This allows you to build your career in a deliberate way - not by chance. We are part of an international organization listed on Nasdaq Stockholm, operating in 11 countries. In Poland, we operate with full autonomy. We choose our technologies, processes, and ways of working while maintaining the highest professional standards. Join us today. What we offer Work in a Scandinavian culture built on logic, trust, and open dialogue. Health and sports benefits tailored to your needs. Speed Coaching – short sessions designed to provide new perspectives and solutions. Sports training, an internal team, and opportunities to take part in competitions. Role overview: System integration in a Microsoft environment - backend development in C#/.NET, working with Azure Integration Services, handling both on-prem components (.NET Framework 4.8, Windows Server) and cloud workloads on Azure ERP implementation support - integrating the client's existing systems with a new ERP platform, and managing how the ERP integration impacts other integrations already in place across the organisation Application development and maintenance in the Microsoft stack - working with Microsoft SQL Server, ASP.NET (if a web interface is required), and React (frontend, a smaller part of the scope) What you need to join us: Must have: C# / .NET - backend development, including .NET Framework 4.8 for on-prem components running on Windows Server React - frontend development Azure - cloud development and Azure Integration Services Experience with system integrations (ERP or enterprise system integrations) Microsoft SQL Server (MSSQL) and on-prem Windows Server experience English - fluent Ability to work in Poland (citizenship, residence permit, visa, etc.) Nice to have: ASP.NET - web interface / web application (only if required) Familiarity with ERP systems and their integration patterns