Develop a Mac Application

Hi, I am looking to build a web editor for OS X 10.11 + similar to Espresso, which you can see here: [login to view URL] I have some key differences and would like someone to help create full designs for my editor, develop it, and help maintain it. Some of the requirements are: - You download Espresso's trial and determine what features can be included for a Minimum Viable Product - The user interface should be modern and elegant and developed in Sketch - The app icon should be unique and modern - The code should be written in Swift 2+ - You work under an NDA - You provide consultation as this is my first Mac App - You are friendly :) Also a few notes: - I would rather not release this on the Mac App store unless you can convince me otherwise - I want to sell this app so we need to include an update mechanism - We must not copy any code or user interface elements from Espresso