I am an old certificated .NET/C# programmer working with .NET for 20 years. All ASP.NET MVC versions, including ASP.NET Core and WEB API, are well known. Last ten years I was working on the support of large responsive, multilingual hybrid applications (ASP.NET MVC + Angular), and front-end programming is not a problem for me. I shall test your Microsoft Authentication and fix all problems.
I live in Lithuania (+2GMT). Human languages: Lithuanian (native), English, Russian (at mother tongue level).