Create an Amazon auto-ordering bot using Selenium

About us:
Our company is developing tools and services for ecommerce businesses.

What we're looking for:
An experienced web developer to create an API service that will make Amazon orders automatically using Selenium, based on a single POST request.

We need the following deliverables:
- A working auto ordering service that will make Amazon orders based on a POST API request
- The service should take into account, that by design we will need other marketplaces integrated in the future - Walmart, AliExpress, etc.

To complete all the deliverables, the right developer will have experience in the following:
- 1+ year experience with Selenium
- Writing maintainable code and reusable components

Examples of similar services to what our service will be:
- zincapi.com
- apis.easync.io

In your proposal, please share:
- Do you have suggestions to make this project run successfully?
- What challenging part of this job are you most experienced in?
- What past project or job have you had that is most like this one and why?
- Your hourly rate and total cost estimate for the project
- Skype ID