The core activity of GNIEP Sàrl is the development and implementation of complex VBA applications (Visual Basic for Applications) and Excel spreadsheets, including process automation, implementation of lightweight management tools and decision support systems, as well as integration of Excel with external systems such as Microsoft SQL Server, BI platforms and AMPL. Additionally, the company provides services such as reviewing and documenting existing Excel spreadsheets and VBA code, Excel error correction and optimization of Excel workbooks.