Build a full functioning eCommerce website on a CMS platform

We need a new eCommerce website built on a CMS platform like Shopify or WooCommerce or something similar with an easy to use WYSIWYG admin interface.

The site will have multiple user facing pages:
- Homepage
- Product category pages
- Product page
- My account page
- Shopping cart
- Payment page
- Thank you page
- Login Page / Popup Screens
- Profile page

For the back end, we will also need pages:
- back end product management screens
- admin screen
- user management screens
- order management screens

Additional features we are also looking at having on the website:
- infinite scroll on product category
- countdown timer
- "on sale" labels on product cards
- "XX% off" labels on product cards
- payment gateway integration
- login screens to be able to sign up & login using social logins like FB, Google etc

We also need a custom widget to be either built from scratch or modified from existing functionality to be able to deliver the feature we need.
Similar features which we have seen, that kind of do the same thing, but not quite there are:
https://apps.shopify.com/firehonor-group-buying (Shopify)
or
https://woocommerce.com/products/group-buying/ (WooCommerce)

Please refer to our document - 3_ProductDetailsPage to see the widget we need for the product pages.

For WooCommerce, these are the two themes we liked and shortlisted:
https://woocommerce.com/products/emart/ https://woocommerce.com/products/gizmo/

For Shopify, this was the only theme we liked and shortlisted:
https://themes.shopify.com/themes/veena/styles/megamall/preview

If this is a project you can code up and create the widget we require, then we can award this job accordingly.