MacOS developer for Safari App Extension #1

Hi, we are looking an experienced MacOS developer who has worked in Swift. This project is for an example Safari App Extension[1] that implements some basic functionality needed for another app. This project requires experience with: - Swift and Xcode - JavaScript - JavaScript Core Framework App functionality: 1) load an internal webpage including scripts via JavaScript Core (this page needs to run in the background as long as is Safari is running) 2) needs to inject a static number of scripts into all webpages (Safari tabs) 3) allow 2-way communication between the injected and the internal scripts[2][3] 4) load another internal page (i.e. [login to view URL]) and show it to the user 5) implement a Safari toolbar button and on click load[4] another internal page (i.e. [login to view URL]) and show it as popover[5] to the user 6) allow 2-way communication between the all internal scripts (background and options+actions) 7) implement an interface to store (stringified) app data via background script References: [1] communication always means sending and receiving JSON document