User Experience / Build Your Own Box / Price Negotiable

Hello. We're Urban Nature a portuguese company that sells snacks - and we work in Portugal! :) We are looking for a expert to do this kind of development for our website to improve our user experience at our store that's based in Shopify. The challenge is: We would like to create a area in our website that permits our costumers to BUILD YOUR BOX - like what we show on the images that we took by example. The goal is to make the costumer experience much more easier that the one that we than the one we provide now (because to build a box the costumers have to enter in each product individually and chose the quantity that they want and when enter in other product and when repeat the process all again). So we need some kind of solution that allows the costumer to chose all the products that their box will contain in the same page, we aren't stuck to the design that we show at the example, quite the contrary. quite the contrary! We want this new area of the site to be as similar to our design as possible. So, we're open to need ideas for making possible to costumers to chose in the same page their box and go to checkout and pay - without the need to going jumping from page to page. We're looking for to ear some suggestions! Catarina Cabrito