Job Description: L3Harris has an immediate need for a Signal Integrity/Stackup PCB Design Specialist whose role defines and optimizes rigid, rigid-flex, and multilayer PCB stackups for signal integrity, power integrity, impedance control, EMI/EMC, thermal performance, and fabrication constraints. Partner with electrical engineers to translate Signal Integrity(SI)/Power Integrity(PI) requirements into practical routing rules, return-path planning, reference-plane strategy, grounding, shielding, and layer-transition guidance.