Understanding of SPICE simulators and simulation methods, preferably using LTSpice, TINA, PSpice Experience with the following PCB and CCA design features: micro-via and blind/buried vias, stacked micro-vias, via-in-pad and via fill/cap processes, controlled impedances, backdrilling, high pin count / fine-pitch BGAs, Chip-on-Board (COB), QFNs/DFNs, LGAs, and other advanced IC package types. About BAE Systems Electronic Systems BAE Systems, Inc. is the U.S. subsidiary of BAE Systems plc, an international defense, aerospace and security company which delivers a full range of products and services for air, land and naval forces, as well as advanced electronics, security, information technology solutions and customer support services.