Senior Estimator (Timberline Expert)

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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.

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AECOM is seeking a Senior Estimator to work on a hybrid basis in our Sacramento, CA Office.

JOB SUMMARY

This role will be responsible for developing detailed and accurate cost estimates as part of the Project Controls & Project Financial Office for the California High-Speed Rail Program. The role functions as an integral team member, contributing to the planning and execution of cost estimation activities to support program goals and financial oversight under the general direction of the Estimating Manager.

JOB RESPONSIBILITIES 

• Develop capital cost estimates across all project phases, from planning and conceptual design to final design and construction.
• Facilitate the coordination and collection of information from internal departments and external stakeholders to support accurate cost estimation.
• Contribute to the development of capital cost estimates for key program deliverables, including the bi-annual Programmatic Business Plan, Program Baselines, and Project Update Reports.
• Review and analyze contractor-submitted estimates and claims to ensure accuracy, consistency, and alignment with program standards.
• Assist in creating and maintaining policies, procedures, and standards for program-wide cost estimating practices.
• Collaborate with the Estimating Manager and Project Controls team to ensure alignment between scope, schedule, and cost.
• Maintain cost estimate documentation and support audits, reporting, and oversight functions.
• Participate in process improvement efforts to enhance the accuracy, efficiency, and transparency of cost estimating activities.

MINIMUM REQUIREMENTS

• BA/BS + 8 years of relevant experience or demonstrated equivalency of experience and/or education

PREFERRED QUALIFICATIONS

• Bachelor’s degree in Civil Engineering, Construction Management, or related field.
• 15+ years of estimating experience, including 10+ years on large transit projects ($1B+).
• Proficient in cost estimating and database software (e.g., HCSS, Timberline, Onscreen Takeoff).
• Strong skills in cost analysis, change order evaluation, and negotiation.
• Proven experience leading estimating teams on complex infrastructure programs.
• Effective communicator with ability to interpret plans, develop scopes, and present to stakeholders.
• Professional certification in cost estimating or engineering preferred.

• Some travel may be required
• Sponsorship is offered for this position

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 aecom.com. 

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, 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.