Ecommerce Website Mangento & Mysql

Purpose

The purpose of the solution is to sell our products from the website. The solution will also be used for invoicing with basic accounting functions from the back end.
Scope
The solution is a B2B platform build to sell food ingredients and used by the back end for dispatching the materials with accounting 
Overview
The project is not a market place. It is simple project with few products and multiple SKUs of the same.
The products will be having multiple brands and SKU’s of the same for eg.

100gms Pack, 250 gms Pack, 500 gms Pack.
We need an economical pricing solution to sell spices to retailers and restaurants. We need to display a different pricing slab for different quantities. An api will be made for the android and ios apps.


The solution enables the seller to display variable pricing for the same SKU based on the quantity chosen by the buyer. The  buyer should be able to leave a feedback for not buying the product.

Upgrade
The project will be frequently updated and the developer will be compensated accordingly.
Reponse to this post should include the following:
Where are you based at?
How many years experience do you have in Magento 2.X?
Can you please share websites in Magento 2.X?