android mobile app for classified/business listings -- 2

project to build(both design and development) a native android app for business listings like justdial. highly secure, light, fast and scalable mobile app with ability to interface with facebook and gmail of users. Support huge number of concurrent users. Bidder must have developed similar apps and must be familiar with apps like justdial. Google Firebase development experience is desirable. app will be similar to sulekha or just dial The app will need the following functionalities at a high level: 1) Admin module - to authenticate,approve, delete,block,place on hold business users who will sign up. Ability to filter subscribers by area code/pin code or by town/city and be able to send group messages. Ability to send in-app messages to any user of the app. ability to generate analytical reports, track payments, mobile number verification of users 2) Subscriber module/business owner module - sign up using facebook/gmail, create own listing for store/service by selecting appropriate category,create offers, be able to send group messages to app users with a specific area code/pin code, create own profile, share on facebook, pin store location on map, ability to make payment 3)Sub admin module - will have some capabilities of the admin module 4) User/Buyer module - be able to create own profile/account, upload pics, rate business owners, share on FB, be able to search using multiple fields, be able to send msg to business owner within the app,,ability to make payment and track payments Bidder should be able to support app testing,and maintenance for long term