Hello,
I am John Ofagbe, a professional web developer and software engineer. I have read through your project description and I can develop an elegant system to manage the Amazon Seller Central. Why? Because I have already developed such a system for several clients. It is powered by WordPress and does so many automation, such as order fulfillment, automatic shipments and price automation, among other things. I can't show you a specific project because of the contract with my client. But I have the source codes I developed myself.