Build me a Map-based app and edit my Google Maps to add to my website with my own design

We are building an app that will consist of a map with different layers. We also have a website with Squarespace and we want to integrate our design of map to it. We can integrate the map with an iframe using HTML. We have made the designs of all. Our current map is done with Google Maps, which can be exported to KML/KMZ. Things we need: – App for: Iphone X, 6, 7, 8, 6+, 7+, 8+, Android – Map for a website (Laptop and mobile design): Chrome, Safari, Explorer, Mozilla. We have created the screens for these in Adobe XD CC, we would be happy to supply the files if they save you time. Requirements on the maps: – We want info of business to match the ones on Google reviews (Screen 4 below). – We want the map to update itself when we edit the original map if possible. – Sections needed: Search bar, menu of layers and full-screen mode (Website only).