Buy & Sell Website

Hello, [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] Basically a mashup of all the above.. Website should have all the features above including: 1) Responsive of course with VERY HIGH FOCUS ON Mobile version of website 2) Geo location -- based on phone's gps (or user can set from desktop) 3) SMS Verification for posting ads..for users or non users 4) User account > ad management 5) Ad expiration based on account type 6) Spam detection 7) Duplicate listing 8) Language Selection on the fly -- users can click on language button to switch from Spanish to English or another language in 1 [login to view URL] refresh.. 9) Mobile listing -- directly from phone ([login to view URL] --not with app..from phone's browser) 10) Community flagging / auto flagging / review 11) user verification ..email + phone 12) BACK END --- BACK END --- BACK END --- This is the MOST Critical part... We need to be able to MANAGE...EVERYTHING.. efficiently... if we select you.. we will use you to build an app too later..but that's later... ================= PLEASE READ BEFORE BIDDING / REACHING OUT =========== 1) PLEASE VISIT SOME OF THOSE WEBSITES --- SEE their feature.. 2) I want to see example of similar site YOU HAVE BUILT..or any work LINK you can send me as a reference.. 3) pls tell me what technology you'll use / what cms / custom.. etc 4) REACH OUT TO US.. Tell us.. if you can do it. how many days/ weeks.. PLS DON'T WASTE OUR TIME... thank you.