Highly Miniatured PCB at Production Level for A Smart Zip

I need an electronics engineer and PCB design expert to help design a highly miniaturised and compact PCB. This PCB will be used to control a smart zip which is a very small form factor. The PCB will contain circuits such as a DC motor controller, microcontroller(max size 7x7mm but could be 3.6x3.5mm), battery level sensing, charging controller, interface to a finger print sensor, interface to two contact sensor, an RGB LED and interface to a Hall effect sensor. All of these need to fit in a space of 15x15x5mm.