Shopping Cart Developer (Zen Cart, Shopify) David

We are looking for an experienced shopping cart developer to take on a specific project.
Ideally, the developer would have experience connecting a shopping cart solution directly to a listing, and inventory management and accounting system such as Zoho business.
The project is to build a Business 2 Consumer shopping cart solution for a Stone Fabrication Tools and Supplies wholesaler.
The Stone Fabrication Tools and Supplies Wholesaler currently has a website, but listing and shopping cart solutions will only work for accounts created by other retail companies – it is a B2B website and shopping cart solution.
In other words, the shopping cart solution doesn't work for shoppers who are end-consumers (rather than who are wholesalers also).
The application used for ecommerce is called "Onsight B2B Sales App".
The project is to determine a shopping cart plug-in that can be integrated with Onsight b2b sales app, and which can also be connected to Zoho business so that inventory and accounting are properly tracked.
In order to help us narrow down applicants - could you please answer the following in your application:
1. Which shopping cart plug-in or app would you recommend to be used? Why?
2. What would be your general approach to integrating the shopping cart with Onsight b2b sales app & Zoho business?
3. Have you done work with Zoho business before?
Kabalo ko magbisaya, kay sa Cebu ko nagpuyo sa dugay na (mga 2005).
Salamat!
James