Website development (angular.js for front-end node.js for backend,socket.io for chat)

Looking for website design and development with the concept where user can hire freelancer by discussing work and negotiating payment in chat and confirms and pay to escrow, in e-com same user can purchase material in bulk by doing message (no chat) to vendor for negotiation and vendor will reply to that msg, msg conversation will go on till [login to view URL] payment is same like above freelacer type, escrow system, milestone type. - Job posting - Bidding - Live chatting - Inventory module - Seller dashboard - Buyer dashboard - milestone Process with escrow and payment management - Multiple Logistics - auction system with deposit - dispute management system NDA must be signed before takeoff Minimum, 1 year of development work+ onGoing maintenance work