C2c business plateform app for android and ios version

Dear worker we need a c2c shopping future goods app by andorid and ios version 1> 3 roles buyer and seller and admin 2>buyer can post buying leads leads should have buy xxx ,duration ( timeline what time to what time ) buying margin percentage (10%-25% ) buyer should save customery's deposits amount to site 3> seller can post selling leads --want sell xxx duration ( timeline what time to what time ) selling margin percentage (10%-25% ) ,give products id and pw the process of deal 1> reg-login-create my profile - post/ search leads -click leads detail - negotiate selling margin/duration before accept deal /share/rate/ranking /contact 2> after the deal accepted by buyer ,selling should also save customery's deposit to site 3> once the deal success within the duration ,the buyer can get the margin plus seller's deposits 4> if the deal failed with the duration, the seller can get the buyer's deposit 5> the admin will charge　the service fee for both buyers and sellers by marge of percentage well the site function look like the freelancer site but it is more simple than them any worker who are interesting in that ,pls contact us we do hope such project to be completed within 2 months Thanks so much for your attention sky tradetuber frank