AECOM is seeking a hands-on Senior Travel Demand Modeler to join our Arlington, VA office, supporting a diverse portfolio of transportation planning and modeling projects across the Mid-Atlantic and nationwide. This role is ideal for a technical expert who actively develops, calibrates, and applies models, not just oversees them. You will work within a collaborative team of approximately 10 modelers, contributing directly to model development while guiding junior staff and supporting client engagement.We are particularly interested in candidates with experience in dynamic traffic modeling or Activity-Based Modeling (ABM), and those with a demonstrated interest and capability in software development, such as C, for high-performance modeling.or similar applications. This is a hybrid work option with a consideration of being remote.Responsibilities:Hands-on development, calibration, validation, and application of travel demand models (trip-based and/or activity-based)Implement, enhance, and maintain travel-demand modelsApply and refine mode choice models and advanced discrete choice frameworksDevelop and apply dynamic traffic assignment (DTA) and multimodal modeling approachesContribute to or develop model components, tools, or extensions in C or other high-performance languages, as appropriateDiagnose and resolve model and code issues, ensuring robust, efficient, and reproducible outputsSupport integration between modeling platforms, scripting environments, and core software componentsLead technical discussions with clients while remaining actively involved in analytical workProvide technical mentorship through code reviews, modeling guidance, and collaborative problem-solvingContribute to automation, performance optimization, and workflow improvementsSupport proposal development and technical approach writing
