Hello Client
I am shopify expert.
My main skillis CMS development.
I have good experience with web development using shopify,wordpress,woocommerce, Magento, prestashop, Drupal, Joomla, ...etc in 7 years.
I already check your description carefully and I know what do you want.
My pros is best Algorithm and strong security.
I will follow your suggestion about budget for you.
if you want fair cost and highest quality please contact.
I am ready to work anytime.
I will try my best for you.
regards
Alex