Mechanical Engineer, MEP

Company Description

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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.

We're one global team driven by our common purpose to deliver a better world. Join us.

Job Description

AECOM is seeking an experienced and technically driven Principal HVAC Engineer to join our growing MEP practice. In this senior individual-contributor role you will serve as a recognized technical authority on HVAC systems across a portfolio of complex, multi-discipline projects — ranging from commercial and institutional buildings to critical infrastructure and industrial facilities.

Responsibilities:

Technical Leadership & Design

• Lead and independently execute the HVAC discipline component of Plans, Specifications & Estimates (PS&E) packages, from concept through construction documents.
• Develop and apply advanced HVAC design methodologies — including load calculations, equipment selection, ductwork and piping design, and energy modeling — ensuring accuracy and code compliance.
• Serve as Lead Verifier on projects, confirming that the technical approach satisfies the client's scope of services and expectations.
• Prepare and review complex technical specification sections for HVAC systems, ensuring clarity, completeness, and alignment with applicable standards.
• Develop construction cost estimates and technical effort estimates for HVAC scopes of work.
• Identify and introduce new design processes and tools that improve efficiency and work quality across the discipline.

Quality Assurance & Interdisciplinary Coordination

• Perform quality control reviews of HVAC design calculations, drawings, and specifications produced by the project team.
• Participate in and lead interdisciplinary reviews of project deliverables, resolving conflicts between HVAC, structural, electrical, plumbing, and fire protection systems.
• Engage with cross-discipline technical teams to confirm project approach and review deliverables, ensuring integrated and buildable solutions.
• Analyze complex design issues, recommend solutions, and define new procedures where standard methodologies fall short.

Client & Stakeholder Engagement

• Communicate with clients to discuss scope of work, gather technical information, and address comments on draft deliverables.
• Leverage client credibility gained from delivering high-quality technical services to expand work assignments and support business development.
• Convey complex or sensitive technical information clearly and persuasively to internal teams, clients, and external stakeholders.
• Assist with technical proposals and support the pursuit of new projects and funding opportunities.

Team Development & Knowledge Sharing

• Provide structured guidance, mentoring, and technical training to junior and intermediate engineers, developing team capabilities.
• Share technical expertise through internal communications, presentations, and knowledge-sharing sessions.
• Contribute as an in-house expert on HVAC technologies, systems, and evolving industry practices.
• Actively pursue continuous learning of technical advances, industry trends, energy codes, and competitive positioning.

Qualifications

Qualifications & Experience:

Required:

•        Bachelor's degree in mechanical engineering or closely related discipline.

• Minimum 10 years of progressive experience in HVAC engineering, with a demonstrated track record of leading discipline deliverables on complex projects.
• In-depth knowledge of HVAC systems — including central air handling units, chilled water and heating hot water systems, variable air volume (VAV) systems, exhaust and ventilation systems, and controls integration.
• Proficiency in HVAC load calculation and energy modelling software (e.g., Trane TRACE, eQUEST, HAP, or equivalent).
• Strong working kn