Analyzes, researches and develops structural engineering specifications involving metals, non-metallic or composite structural materials for product design, or operation of product to include structures, mechanical, hydraulic, electrical and electronics, power plant, armament, heating and ventilating, equipment and maintenance designs. Principal Structural Engineer: Bachelors degree in a Science, Technology, Engineering, or Mathematics (STEM) discipline from an accredited university and 5 years of relevant experience, OR a Masters degree and 3 years of relevant experience, OR a PhD and 1 years of relevant experience.