Manage company Amazon presence

We are looking for a company that can directly manage our company's presence on the Amazon platform. The selected contractor will be hired on a contract basis but with the long-term idea to be permanent based on the performance. General things we are looking for:

Daily management of all Amazon listings for our company
Develop KPIs for understanding how well the listings are performings, and how to improve them
Give weekly reporting based off KPIs, and as-able compare to similar products from competitors
Propose new ideas on improving existing listings