Greetings,
I have read and understood your requirements, you need someone expert in PCB designing. I am an electronics engineer and expert in PCB design tools and multilayer PCB designing with 3d step files using KiCad, Altium designer, EasyEDA, Multisim, EagleCAD and Proteus. I will do the design using your preferred tool.
You can see my portfolio/ reviews and feedback regarding similar projects. Please send a message in chat to discuss further details.
Regards,
Ahmed.