Senior Transportation Planner Engineer – Travel Demand Modeler

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 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 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

Qualifications :

Minimum: 

• Bachelors 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
• Proficiency and experience with C or demonstrated aptitude and interest in developing modeling-related software components
• 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
• Masters 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)
• Professional certification (PE PTP or AICP)
• Hybrid position slightly preferred over remote position
• Demonstrated 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 models

Additional Information :

• Relocation is not an option for this position
• We 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 AECOM 

AECOM 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 . 

What makes AECOM a great place to work 

You 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 youll 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 youve always envisioned. Here youll find a welcoming workplace built on respect collaboration and communitywhere 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. 

Remote Work :

Yes

Employment Type :

Full-time