Software Developer for Automated Listing

We are looking for a developer to create a software with the following details below:
NOTE: This is from scratch so just pitch to us how we can make this a reality.


Must USE API
Multi-Channel Upload ( Amazon, Walmart, Shopify and Etsy, Facebook)
Automatically Sychronizes Product Listings in minutes
Data in User-Friendly Format
Streamline, automates and generates results across mulitple channels in minutes converting date into User-Friendly Format
Easy Integrations
Operating System: Mac/Windows

Submit to us the following:
Resume
What language you will use
How are you going to approach this project and overview on creating it
Price and support price
Timeline.

Steps:

Portal Development
Overview Structure planning:
Design of portal
Front page.

Main Features:
Upload of Products
Image and Text
Product Management
Editing, Deleting and others
Products Approval
User Management
Who will have access and restrictions to each Upgrade to see actual infoegration

Facebook Marketplace
Amazon
Walmart
Etsy

Developers will study each integration process for each of this marketplace and integrate through API.