Courier Tracker Android Application

Hi, I need the application for a couriercompany, where API is already developed however there are few request up-gradation will be needed. That's how the application will work Courier company works nation wise from one city to another city when the courier package reached on the destination city then Delivery boy pick the number of packages and deliver the packages on the delivery addresses. One Delivery guy will be allotted the specific area to deliver his packages and we need to restrict the delivery guy in specific area and it will monitored as well using his GPS location, if he go outside of his allotted area then an alert will be generated and a notification will be sent to admin. Once delivery guy reach to delivery package address then delivery guy will use this same application and will add the customer Name and NIC, also take the customer snap + signature or thumb impression on the touch screen, this information will be saved in the application offline and data will be sent to sever as well, if there is slow internet like edge then only information will be send while snap will be sent once they delivery guy access the wifi. There will be admin area where admin will create the account of delivery guys, he can assign the packages, locations etc to all the delivery guys accounts and admin will track his movements as well while sitting in the office. Application need to be simple and very user friendly. Front End Design Needed There are two type of Customers o Walking Customer (track on the base of courier track number) o Corporate Customer Corporate customer get an account from us and we provide them detail services, However it is not mandatory. This tracking functionality will also be the part of the application. Time Frame: 4 to 6 weeks