Build a Inventory, B2B, and Fulfilment Web App - 26/03/2018 02:03 EDT

Looking to build a Web app to service e-commerce accounts; 1) Ecommerce Inventory Management - handling multiple e-commerce accounts connected to carts (Shopify, WooCommerce) and marketplaces (Zalora, Lazada). Something like Orderhive 2) B2B Ordering - For the same accounts that also send items to retailers. Something like Handshake. 3) Tracking services - for the fulfilment. 4) Client portals It's actually quite a massive system where integration is key between e-commerce carts, marketplaces, and the inventory system