I mainly work in mobile development, developing cross platform Android/iOS/Windows apps using .Net Maui and Xamarin.Forms apps in C#. In the past I've done a lot of native development with Java/Android studio, and Objective-C in XCode.
I also do lots of web development using C# + ASP.Net WebForms/MVC/Web API/Entity Framework (both .Net Framework and now .Net Core also) in a Visual Studio environment - mostly for CMS-driven websites. I write a lot of Umbraco and nopCommerce sites and companion APIs and mobile apps in my spare time.
Also enjoy dabbling at front-end stuff with Bootstrap, Angular/TypeScript, jQuery etc.