Shopify Store Customization

I am looking for a skilled programmer to add several functions to my online marketplace for Instagram shoutouts. The site will be similar to [login to view URL] The project will most likely be ongoing as we upgrade he site. I currently use Shopify and have a multi-vendor seller app that allows anyone to sign up and sell their products on my site: [login to view URL] Functions needed: • Allow users to sync Instagram account information with each product listing (followers, profile picture, and engagement score). They must confirm ownership of account by placing short string of numbers/letters in their bio. • Seller product setup page with locked in variations of: account username, duration of post, optional bio link, and story post. Each seller can set their own prices. The post should automatically aggregate the Instagram account's profile picture and most recent timeline photos. • Easy checkout page for advertisers that allow them to input their desired: caption, photo/video, and time & date of post. • Add a system for sellers to the posting of each advertisement at the specified time by the advertiser. The seller should be notified via email 30 minutes prior to posting and then confirm the post by placing a customized code in their caption when they post. I am hoping that these functions can be added while using my current multi-vendor Shopify app. However, I am open to the possibility of needing a custom multi-vendor app created for my system.