The Journeyman JavaScript/React Developer at Amentum is responsible for leading multiple development teams in the creation and maintenance of data cataloging and management services that comply with government architecture and design principles. This role involves overseeing the full lifecycle of software engineering support, from requirements gathering to system performance verification, while ensuring adherence to structured architecture principles and agile methodologies. The position requires providing technical direction for modernizing services using AWS managed services and custom microservices, as well as engaging with government IT leadership and development teams to deliver technology-based solutions.