Customization in Shopify Filters and Collections

I am looking for a Freelancer to perform customization on the filters and collections on a Shopify store. The level of customization I need is Basic, and I have a list of specs ready. Custom coding will be required and any suggestions would be greatly appreciated. I'm looking to find someone with the skills and experience to provide me with quality customization that follows my specs, as this project is very important to me. Thank you in advance for your help.