Senior Transportation Planner / Engineer – Travel Demand Modeler at AECOM — NeverHard

Job Description 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 models Apply and refine mode choice models and advanced discrete choice frameworks Develop and apply dynamic traffic assignment (DTA) and multimodal modeling approaches Contribute to or develop model components, tools, or extensions in C++ or other high-performance languages, as appropriate Diagnose and resolve model and code issues, ensuring robust, efficient, and reproducible outputs Support integration between modeling platforms, scripting environments, and core software components Lead technical discussions with clients while remaining actively involved in analytical work Provide technical mentorship through code reviews, modeling guidance, and collaborative problem-solving Contribute to automation, performance optimization, and workflow improvements Support proposal development and technical approach writing