Marketplaces Manager Expert- Amazon, eBay, Shopify

I am looking for a personal assistance in the fields of eCommerce and marketplaces,

Our business own 2 product brands with some 5-10 products in each brand, these products are currently sold on amazon.com .co.uk and .de and on our own Shopify based sites,
We are now looking to expand into additional markets and marketplaces...

This is a full time job where the selected candidate be setting up new marketplaces, uploading all products into these marketplaces, monitoring them and be responsible for fulfilling the orders.

You Must be an expert on Amazon Seller Central and FBA as well as ebay listings tools.

Your initial task will be to set up my eBay.com account and create some 10 listings from my current amazon account. - you will also need to monitor and fulfil the orders from the eBay account through amazon FBA where our inventory is stored.

As this will be a continuos work with creating additional marketplaces stores (eBay UK, Amazon JP, Amazon CA, etc...) Please share your experience with such marketplaces if any.

BONUS Advantage: Share your experience with a software/service to centralise, manage and fulfil orders from these different marketplaces.

BONUS Advantage #2: Share your experience with 2-3 strategies you are familiar with and can implement that can boost sales/rankings for my products.

BONUS ADVANTAGE #3: knowledge and experience with amazon product ads to drive ppc traffic from amazon to my website.