Custom 3D Print Design

I am looking for a 3D printing designer/professional. I'm looking for someone who can take a current product use it as a template and help me figure out how to customize it and make it better to fit my needs. I have the current 3D print pattern or design file for the product that I'm trying to improve or emulate. I need someone that can help figure out how to make changes to make it better and help me bring my design ideas to life.