Shopify theme update and troubleshooting

Hello, I have a live site right now that needs some troubleshooting both on the design and the back end. The perfect person for this job will have Shopify experience and is familiar with their back end. On the design side of things I need some drop downs styled and implemented. I also need some small fixes like adjusting margins etc. On the back end the cart is not passing the color variant to the invoice and need some help figuring that part out. Finally the last and possibly biggest part of this project is that the last developer was using Ruby on rails to update all the files etc and using [login to view URL] for the css. I would love to transfer all this code from using Ruby to being stored locally on their shopify account so that they can go in and make small adjustments etc without having to rely on Ruby. Upon accepting the job I can deliver a pdf with everything marked up and ready for you to work on. I can provide login to site and ask that you work on a copy of the theme and not the actual live site until all the work is done and ready to be turned on. I would normally tackle a job like this but I am heading out of town and need someone to continue the work while I am gone.