Senior Transportation Planner / Engineer - Travel Demand Modeler

Company DescriptionWork with Us. Change the World.At AECOM, we're delivering a better world. Whether improving your commute, keeping the lights on, providing access to clean water, or transforming skylines, our work helps people and communities thrive. We are the world's trusted infrastructure consulting firm, partnering with clients to solve the world’s most complex challenges and build legacies for future generations.There has never been a better time to be at AECOM. With accelerating infrastructure investment worldwide, our services are in great demand. We invite you to bring your bold ideas and big dreams and become part of a global team of over 50,000 planners, designers, engineers, scientists, digital innovators, program and construction managers and other professionals delivering projects that create a positive and tangible impact around the world.We're one global team driven by our common purpose to deliver a better world. Join us.Job DescriptionAECOM 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 writingQualificationsMinimum: 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 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: Experience with COG/TPB Gen2 Travel Model (trip-based)Experience or exposure withActivity-Based Models (ABM) orCOG/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 modelingBig data processing (RITIS, StreetLight, Replica, TomTom, etc.)Cloud environments (AWS, Azure) for model executionVisualization 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 (a plus):Writing or modifying core modeling code in C++Improving performance, memory efficiency, or scalability of modelsAdditional InformationRelocation 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.About AECOMAECOM is proud to offer comprehensive benefits to meet the diverse needs of our employees. Depending on your employment status, AECOM benefits may include medical, dental, vision, life, AD&D, disability benefits, paid time off, leaves of absences, voluntary benefits, perks, flexible work options, well-being resources, employee assistance program, business travel insurance, service recognition awards, retirement savings plan, and employee stock purchase plan. 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. Learn more at aecom.com. What makes AECOM a great place to workYou will be part of a global team that champions your growth and career ambitions. Work on groundbreaking projects - both in your local community and on a global scale - that are transforming our industry and shaping the future. With cutting-edge technology and a network of experts, you’ll have the resources to make a real impact. Our award-winning training and development programs are designed to expand your technical expertise and leadership skills, helping you build the career you’ve always envisioned. Here, you’ll find a welcoming workplace built on respect, collaboration and community—where you have the freedom to grow in a world of opportunity. As an Equal Opportunity Employer, we believe in your potential and are here to help you achieve it. All your information will be kept confidential according to EEO guidelines. SummaryType: Full-timeFunction: Strategy/PlanningExperience level: Mid-Senior LevelIndustry: Construction