Senior Transportation Planner / Engineer – Travel Demand Modeler
About the role
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.
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
Qualifications
- Minimum: Bachelor’s degree in Engineering, Transportation Planning, Applied Mathematics, Computer Science, or related field, 8 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 models
- Proficiency and experience with one or more platforms: Cube, TransCAD, VISUM, TRANSIMS, DTALite, DynusT, or similar
- Ability to develop custom data analysis routines in Python, R, C++, or similar
- Experience working with large datasets and model workflows/pipelines
- Advanced skills and experience in Excel and data analysis
- Experience with GIS platforms (ArcGIS Pro or QGIS)
Preferred
- 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 DOTs
- Master’s or PhD in a related field
- 10 years of modeling experience with increasing technical responsibility
- Familiarity 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)
About AECOM
AECOM is the global infrastructure leader, committed to delivering a better world. As a trusted professional services firm powered by deep technical abilities, we solve our clients’ complex challenges in water, environment, energy, transportation and buildings. Our teams partner with public- and private-sector clients to create innovative, sustainable and resilient solutions throughout the project lifecycle – from advisory, planning, design and engineering to program and construction management. AECOM is a Fortune 500 firm that had revenue of $16.1 billion in fiscal year 2025.