Location: Łódź or Warsaw, Poland. Hybrid 2/3 days per week.Language Requirements: English & PolishAbout the Role: We are looking for an experienced Senior .NET/WPF Developer to join the team. This role involves developing and maintaining advanced desktop applications and contributing to high-quality software solutions.Key Responsibilities:Design, develop, and maintain desktop applications using WPF, .NET Framework 4.6+, C#.NET, and Unity Framework.Work with Entity Framework 6 for database interactions.Develop, customize, and maintain reports using Crystal Reports, RDLC, Aspose, and MS Excel.Collaborate with database teams using MS SQL Server.Use Visual Studio 2015/2017 Professional and SSDT for development and database management.Participate in client interactionsRequirements:8+ years of experience with the technology stack listed above.Strong expertise in WPF, .NET Framework 4.6+, C#.NET, Unity Framework, Entity Framework 6.Solid experience with MS SQL Server and reporting tools (Crystal Reports, RDLC, Aspose, Excel).Proficient with Visual Studio 2015/2017 Professional and SSDT.Fluent in Polish and English (both written and spoken).Ability to work 2–3 days per week onsite, and full-time during client visits (1 week) as required.