Custom Project Shopify

I’m looking for a developer with high familiarity to the shopify website interface, templates, and/or custom web application. I have a website hosted by Shopify and I want to modify the template, interface, or implement a custom application for how I load and update inventory to the product pages. Currently I enter all data using an excel spreadsheet that becomes extremely tedious due to the variation in products (size, color, style etc). My wish list include a simpler application or interface that gives me all the below qualities and smoothly integrates with Shopify. -Sku -sizes: all with checkbox for selection -pictures upload able option -cost: vendor (hidden) and customer -colors -product title -product type -inventory