Among the various aspects of the present disclosure is the provision of methods, systems, and Rhodococcus sp. strains for the upcycling of polyethylene terephthalate) (PET). An aspect of the present disclosure provides for a system for waste PET valorization comprising: a microorganism capable of growing on PET hydrolysis products, such as PET hydrolysate. PET products from chemical hydrolysis, or alkaline hydrolysis products of PET as a carbon source.