Design and develop a new collection page on Shopify

We seek an experienced Shopify developer to design and build a new collection page template for our e-commerce store. The goal is to modernize the look and enhance the functionality of our existing collection pages which display groupings of related products. The new design should utilize a clean and minimal style with large product images and optimize the layout for excellent mobile experience. Some key requirements include developing a fully responsive template coded with modern HTML5/CSS3 practices, integrating customized sorting and filtering options powered by Shopify's collection liquid code, and ensuring seamless loading of collections containing 50+ products. Bonus consideration will be given to bidders who can implement advanced features like gallery view options, dynamic related products, and image lightboxes. Applicants should have proven experience designing and developing Shopify templates from concept to completion as well as strong skills with Shopify's SDK, AJAX, and liquid templating language. Successful candidates will deliver final optimized code meeting our agreed upon specifications along with all source files and documentation within 3 weeks. Portfolio examples and case studies displaying similar work are highly recommended.