Senior Transportation Planner / Engineer - Travel Demand Modeler

Senior Transportation Planner / Engineer – Travel Demand ModelerAECOM 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. 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 writingMinimum Qualifications:Bachelor's degree in Engineering, Transportation Planning, Applied Mathematics, Computer Science, or related field8 years of directly relevant, hands-on experience in travel demand modeling or demonstrated equivalency of experience and/or education.Demonstrated experience developing, calibrating, and applying modelsProficiency and experience with one or more platforms: Cube, TransCAD, VISUM, TRANSIMS, DTALite, DynusT, or similarAbility to develop custom data analysis routines in Python, R, C++, or similarProficiency and experience with C++ or demonstrated aptitude and interest in developing modeling-related software componentsExperience working with large datasets and model workflows/pipelinesAdvanced skills and experience in Excel and data analysisExperience with GIS platforms (ArcGIS Pro or QGIS)Preferred Qualifications:Experience with COG/TPB Gen2 Travel Model (trip-based)Experience or exposure with Activity-Based Models (ABM) or COG/TPB Gen3 Travel Model (activity-based)Experience implementing or supporting travel models for MPOs or DOTsMaster's or PhD in a related field10 years of modeling experience with increasing technical responsibilityFamiliarity with federal processes (NEPA, FHWA/FTA guidelines)Experience with: Tolling and managed lane modeling, Big data processing (RITIS, StreetLight, Replica, TomTom, etc.), Cloud environments (AWS, Azure) for model execution, Visualization tools (Power BI, Tableau)Professional certification (PE, PTP, or AICP)Hybrid position slightly preferred over remote positionDemonstrated ability and interest in software development beyond scripting, particularly: Writing or modifying core modeling code in C++, Improving performance, memory efficiency, or scalability of modelsAdditional Information:Relocation is not an option for this positionWe are interested in every qualified candidate eligible to work in the United States. Sponsorship may be available for current visa holders in the United States.At AECOM, we are committed to maintaining a secure and trustworthy recruitment process and take any fraudulent hiring activity seriously. To support this commitment, all newly hired employees are required to attend an in-person Day 1 onboarding at an AECOM office location as a condition of employment.