Graphic Designer Needed: Finalize Canva-Based 18x24 Reference Poster

We are looking for a graphic designer to help formalize and clean up an existing AI-generated poster concept for our steel deck supply business. This is not a blank-slate creative project. We already have a strong poster mock-up and want a designer to use it as the starting point, then rebuild it into a polished, print-ready, editable design. The final design will be an 18" x 24" landscape poster used as a direct mail piece. Final file must be built in Canva so our team can make small future edits.