I wrote various applications in C# or using C#. First of all, this is the back-end part of web applications, including those with rather complex logic. Second, these are desktop applications based on Windows Presentation Foundation (WPF) technology that interact with the API of various companies such as Google, Yandex, suppliers or partners of my customers etc.
In C#, I wrote DLLs, OPENid connect (OAuth 2.0), wrote various parsers for price monitoring of certain products on the websites of certain online stores, programs for loading data from a variety of Internet services and then creating management reports, etc.