Write/design an Android application - Social network with Google Maps

Read everything to understand what I really need to build. I need experienced Android developer that understand UX and UI to write me android application that is 70% similar to Twitter but the main idea it to post over Map not only the wall. -The app should work in Android 4.4.0+ -Should be built using Android Studio and you will give me all codes and design also you will be required to sign a NDA. - It should not be restricted or limited as we will later built it for other mobile platforms like iOS App features: -It is a social network like twitter, Users should be able to Register and Login and follow each other. -Every users should have their own profile including their BIO text and photo and a button to follow and other for inbox. They can follow others and others can follow them. -The users should be able to post feeds ( Text , photo, video ) and the posts should grab their GPS location. - After they post whatever they want to , their posts should also appear on the map on their GPS location and the post will also appear on their wall like normal post ( see below Map tab ) -The users should be able to Like or comment on any post. -All posts will be public ( No privacy will be available for post ) - The users should be able to filter post in map according to its time ( Time: Last hour. Last 2 Hour , Yesterday .. ) -The app main navigation bar should consist of 4 tabs on the top side ( Home, Map, Notifications, Profile ) Home tab: Will show feeds from users that I followed earlier. Map tab: Will show a map view ( Google maps ) starting on my current GPS location. And will show PINs of other posts ( Meaning if I posted on my location a PIN will appear on map on my current location and if some on tap it will show a small pop up screen showing part of the text and small photo ( if the post include photo ) and if you tap the PIN again will dismiss it. Notification tab: Will notify the user if some on like/comment on his posts or followed him. Profile tab: mentioned on the top - Other enhancements might be provided Please do not use automatic biding or your bid will be ignored. please write down your full proposal with responsible bid amount and the required time to finish it in milestones. ( If you read this send me this sentence with your proposal __ I am human __ otherwise I will understand you didnt read everything and your proposal will be ignored ) Note that you might get offer to get permanently hired. I did a prototype for the app and the wire-frame is ready for the app to be created ( sample attached ) but forget about it now as this and other will be delivered to you after we reach an agreement and I need your enhancements and suggestions more than my prototype. The bids are sealed