A system for dynamic circuit board design, preferably including a library of modular circuits and a merge tool. A method for merging modular circuitry into a unified electronics module, preferably including: receiving a circuit board layout, the circuit board layout preferably including a set of modular circuits arranged on a virtual carrier board; converting the circuit board layout into a virtual circuit representation; applying transformations to the virtual circuit representation; and generating a unified circuit board design based on the transformed virtual circuit representation.