Hi! I am a super saiyan in Shopify! I have developed more than 20 successful Shopify stores, many of them in Fashion industry. I have done multiple checkout optimizations fro Shopify stores. Please note, advanced Shopify checkout development is only available for Shopify Plus subscribers. Although my hourly rate is higher that your offer, I think it would be beneficial to discuss and do a quick overview of project to see how many hours and how many sprints whole project would take.
If you are interested, please feel free to get in touch with me.
I look forward hearing from you.