Shopify Photo Updates

We are looking for immediate help on our Shopify website. We need all our product photos condensed and re-sized to properly fit into our website. We're looking for someone that is very technology savvy and understands the back end of a shopify website. And as well, experience working with re-sizing photos but yet keeping the resolution the same. There are about 20 different products and 6 variants in each product. So re-sizing about 120 photos. This person will need to have very clear communication with us as to when they're changing which products and preferably being done during 8-4pm CST.