Interface Engineers focus on managing how different subsystems, components, and external systems interact within a larger system. Their work includes defining interface requirements, data exchanges, protocols, and physical or logical boundaries. They ensure interface consistency, manage changes, and resolve integration issues that arise during development and deployment. Interface Engineers collaborate closely with systems, integration, and verification teams to maintain traceability and reduce integration risk. They use interface control documents, modeling tools, and configuration management processes. Interface Engineers work in complex engineering environments such as aerospace, transportation, defense, infrastructure, and large-scale digital systems. Globally, demand remains strong as systems become more interconnected and integration complexity increases.