It's great news that you are getting many excellent bids. Much appreciate if you can share detail requirement so that i can offer my best time and cost estimation.
Technically, I'm having strong experience in working on Shopify platform. I can handle both front & back-end related work. Till the date, I worked on more than 80+ Shopify stores. Happy to share references in detail proposal.
I look forward to embarking on a wonderful business relationship with you!