Shopify Bugfixing

We need our store to have a more dynamic management of different product options and variants and to show the relevant images without using a plugin or any other third party solutions. Also we require to achieve this without displaying any thumbnails but by displaying full sized product variant images. The developer will choose the best implementation as long as the order gets correctly processed by the cart and store owners. The current appearance of the product page cannot be changed in any detail and the developer will have to find the perfect working solution for this problem.