Amazon API, AWS experts need for related project

Amazon web services API experts needed to build a complete sales management software "e bay incorporation will be a major plus". Could be a desktop or online version and commercially marketable, needs to support multiple users each having their own specific log in and access which displays content related to their store. Needs to have essential features like inventory management for amazon ( real time sync with amazon seller accounts and web stores, sellers inventory), Sales order management ( real time download and upload from seller account), shipping management( compatible with stamps,USPS,UPS,fedex) Customer management ( customer email, feedback automated solicitor, Customer queries and question send to web store), Repricing features, amazon FBA compatible, database, etc This is for a complete solution all in one software that will have a commercial application ( will be sold or leased to our sister companies and friends) and we will need the rights to full source code and ownership after completion. We are looking for qualified people or team of people with amazon web store,seller central, AWS, amazon api etc experiences. They should know what they are going to undertake and should not have any surprises later on as this will be big waste of time for both us and yourself. Please do not bid if you or your team or your company has not done any major projects related to Amazon. After completion, we will be retaining the project team for back up and support paid on monthly or annually( open for discussion) We need a commercially viable software, that will fulfill our needs and also we can market it to other companies. The team needs to have professional outlook and must develop a commercially viable and sustainable software. we DO NOT NEED A SCHOOL PROJECT OUTLOOK, please be professional with expereince and high quality of work. If you have a strong concept then we can also discuss terms on percentage basis, There might be slightly more smaller features that might be needed and we can discuss later, however the above are key features and is essential, so keeping that in mind, please bid accordingly.