Rails Pro for Shopify App Development

I’m eagerly searching for an expert Rails developer experienced with Shopify app development. The app was functional, and its 99% rails. Shopify portion is just authentication of the user, saving their store URL into database, and using session ID to display the Rails app part in iframe of Shopify admin. We've hired someone to update and do this initially, they updated Rails already but had no idea on how Shopify_app gem works, even though they said they did know. So we need someone with experience to come in, fix the session function and authroization as currently, installing the app through Shopify puts it into constant loop.

So before you bid, if you don't know what I mean by Shopify session ID or how that works, or if you get confused by looking at Shopify_app gem, please DONT BID!

I'll hire someone for this and future projects with this, as we have big ideas for expansion. No silly bids either, over bid and you won't get my attention.

Thank you!