Refai leads NAMS-2 contract tasks related to Digital Transformation and Security. He brings extensive UAS software engineering experience with NASA following 25 years of experience as a contractor supporting a variety of projects. He developed software for several NASA simulation systems, including Java Architecture for Detect and Avoid Extensibility Modeling System (JADEM), Center TRACON Automation System (CTAS), Future Air Traffic Management Concepts Evaluation Tool (FACET), Airspace Concepts Evaluation System (ACES) and NAS Digital Twin.