Convert the Existing MAGENTO LIVE Website to Shopify Website

Hi there, We have existing Website with Good SEO on MAGENTO Platform and we would get the whole website to Shopify with New Theme but we need to clarify following. - Old URLs ( Magento) to New URLs ( Shopify) Must be perfect as Website is already ranked in Google - New Shopify Website theme will be provided - Need fair bit of customization in Shopify work - Need perfect work as no downtime as Shopify work will be hosted work online - Product CSV and photos will be provided - Content will be provided - Use Free Plugins and make it optimized as possible from Shopify OR-------------------------------------------- - If you think URL redirections will be issue then - Revamp the whole website with New Magento theme - All the data will be provided - Use customization as per the new theme - Bulk upload the products from the Magento - Optimize the website as the same old website Meta and SEO capabilities - Optimize the security on Magento - Latest Magento work required Either or any platform the work is simple around 400 products distributed among the 15 categories. We need someone who can do this work within maximum 2 weeks and required perfect and secure work. No Time Wasters, please!!!