Mechanical Engineer - 4+ years experience

Work 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.

AECOM is seeking a Mechanical Engineer based in Orange, California.

Join our dynamic team supporting exciting projects!  Work independently and make technical decisions based on building code interpretation as well as company, client, and industry standard practices. Mentor and teach junior engineers. Grow your career with us in our Building+ Places group. 

Job Summary/Responsibilities

• Perform assignments requiring application of standard techniques, procedures and criteria to carry out engineering tasks

• Lead the preparation of deliverables and products such as presentation materials, calculations, drawings, specifications, and reports, ventilating, and air-conditioning (HVAC) for commercial, governmental, and institutional facilities

• Exercise judgment limited to developing details of work in making preliminary selections and adaptations of engineering alternatives

• Prepare engineering related calculations and develop drawings and visual aids

• Lead the mechanical design of heating, ventilation and air conditioning systems for commercial and institutional facilities

• Basic knowledge of industry standard computer software (AutoCAD, Carrier HAP, Trane Trace)

• Work independently as well as guide junior engineers as needed on projects

• Deliver complete, accurate, and coordinated project design assignments within time and budget parameters while satisfying client contractual obligations

• Perform field investigations for incorporation of existing conditions into construction documents

• Work within a project team environment and coordinate work with other project disciplines

• Maintain and organize all project-related documentation

• Plan and organize work that follows a defined process

• Work independently and make technical decisions based on building code interpretation as well as company, client, and industry standard practices.

• Mentor and teach junior engineers

About Buildings + Places

AECOM’s Buildings + Places practice includes architecture, interiors, building engineering, workplace strategy, business transformation, asset advisory, economics and development planning, master planning, urban planning, and landscape architecture in a dynamic, interactive, and creative work environment.

With a range of expertise from strategy and design through project realization, we create better outcomes to grow economies, protect natural systems, conserve natural resources, make societies more equitable and connect and engage people through innovative, sustainable design solutions.

Our teams have worked on signature projects such as the London 2012 Olympic Park and Legacy Framework, to the new plan for the LA2028 Olympics, to industrial facilities for GE and Rolls-Royce, to headquarters and workplaces for NASA, Unilever, Sony Music, DirecTV, Box, Inc. and many Fortune 500 companies.

Minimum Requirements

• Bachelor’s degree plus four years of related experience or demonstrated equivalency of experience and/or education

• This position requires U.S. citizenship due to federal contract/security requirements

Preferred Qualifications

• Knowledge of Revit, at least 4 years of experience

• Licensed Professional Engineer Licensed – Mechanical

• Extensive understanding of HVAC engineering fundamentals including load calculations, conceptual systems analysis through construction documentation design, design and layout of equipment, duct, and pipe sizing

• Plumbing and Fire Protection systems design experience is a plus

• Experience with Unified Facilities Criteria (UFC)

• Visit client sites for accurate existing conditions gathering

• Experience with Design Build and other Alternative Delivery practices

• Analyze equipment energy use for optimizing systems selection (EnergyPro, eQuest, IES)

• Instrumentation and controls design/engineering experience

• Experience in the following markets:
  • -Corporate Commercial / Mixed Use
  • -Data Centers/Mission Critical
  • -Healthcare
  • ·Federal
  • -Higher Education
  • -Themed Entertainment

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.