Custom Ag "spray rec" project

Seeking an experienced android developer to write a custom program for my business' internal needs. I run an agricultural operation, and I would like a program to organize and track herbicide and pesticide applications on a daily, weekly, monthly, yearly basis. This program will have several components. (1) A "spray rec" worksheet in the format approved by my state. This worksheet will ideally be filled in through either pen input or by using a menu system (user should be able to add menu items and delete menu items). (2) User should be able to pull data from the spray rec worksheet and prefill certain data into a daily spray map. The map will be a specific map of the agricultural land we manage broken down into predetermined sections called blocks. In addition to the prefill data, each block should be selectable and highlightable by either clicking on a block or using a menu system (user's choice). The user should be able to highlight blocks and save a map with a specific date. This map must be printable, pdf format preferred. The user should be ale to compile maps into a weekly or monthly map (a master map for that week or month). (2a) User will be able to work in strictly a list/spreadsheet mode without the map. (3) Data from the daily maps will be stored in a database, and must be exportable to an excel compatible spreadsheet with user selecting criteria such as block, date, time-frame, etc. The data pulled from the maps will be specific and the spreadsheet output must be in a specific format. (4) Everything must be syncable. User A may fill in data on his device and user B must be able to open the worksheet or map on his device with User A's data. If this is not possible then the program must be compatible with dropbox or a similar program so that users can sync data. User A must be able to lock his work if he desires so that user B can only view and not edit the data. The above description covers the basics. I have another, similar, project if this one goes well.