Android App Development

I need an app designed for major construction project defect items. When the project is starting to come to the fit off and finishing stages there are many things and items that a project manager does not like. I want to have a main screen that has a PDF map of the entire site, with a list of each floor. Then choose the plan/floor you want, then zoom into the exact room and exact area in that room on the map, click the area on the screen and then add a defect. I want a drop down list of hundreds of companies who work on the site, I want them to take a photo of the defect, describe the defect and then put in all of the relevant details about the problem. The company who needs to fix the defect then receives an email to advise them that a new defect item has been created, and on either smartphone, tablet or PC they can log in and look at the area, the defect, the details and everything to do with the problem. There has to be the capability of having tens of thousands of defects and these need to be both displayed as pins on a map and or a list view of the defects as per which company you are. I need there to be authorization levels , the supervisor has access to all the defects but each company can only see there defects. I need there to be a website where these defects are stored and people can go online via a PC and to either delete, update or cancel the defect. This is a very specialized app and I need it primarily on android with looking towards apple at a later stage. I need the screen to be customizable for each company so that each building company can have there own logo and name on the app. Please take your time when bidding for this job as I will be taking my time deciding who to go with. I know that there will be hours spent changing things on this app and I NEED near perfect English skills so that my needs are met fully. Please don't waste my time as I know what I want and I will not be taking second place with the development of this app. Thank you