20 percent of effort can bring 80 percent of result

I am a lead developer of a project management tool Eylean board for agile based processes. My main focus is WPF and windows desktop applications. My main tool is C#/.NET including framework parts like WPF, WCF, Azure, Windows Phone, Windows 8.1, ASP.NET MVC. I am also working on typescript and single page applications, but this is my 2nd choice.