This thesis presents an overview of the technologies used, solution design, and implementation, which is accompanied by parts of code and screen images of the user interface. The meaning and need for such an application are also explained. The "Overview of technologies used" section shows the technologies used, which are ASP.NET Core, Angular, and Auth0. Visual Studio 19 and Visual Studio Code development environments are also shown. Popular technologies have a handful of libraries for various purposes, so the work of programmers is much easier, and popular development environments have various add-ons that check the code and pay attention to the code format. The chapter "solution design" presents the design according to which the application will be made. At the very beginning, the requirements that need to be met are presented. Each part of the application is designed separately and the chapter is divided into subchapters according to the parts of the application. The implementation is shown in the third chapter, it is also divided into subchapters, which contain all the essential parts of the code and images of the essential parts of the user interface. It also shows how to implement Auth0 in ASP.NET Core and in Angular applications. Using Auth0 significantly increases user security and protects personal information. Auth0 offers various additional security checks to make the application even more secure. It is also very easy to implement within the application and is easy to use for the end-user, which makes it one of the most popular central login software.