The Principal or Senior Principal Engineer Supplier Quality at Northrop Grumman is responsible for managing supplier quality risk and ensuring compliance with contractual, regulatory, and technical standards. This role involves developing and implementing supplier quality evaluation systems, conducting product and process verification, and driving corrective actions for supplier quality issues. The position requires direct interaction with suppliers and oversight of supplier performance, including maintaining the approved supplier list and managing waiver requests. The engineer will also mentor junior engineers and lead cross-functional teams to ensure product quality and timely delivery.