Freelance Mechanical Engineer Pe Jobs in Decatur, GA

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 actively seeking a highly motivated, goal-oriented Mechanical Engineer IV (HVAC) for our Atlanta, Georgia Buildings and Places Group.  This role will consist of providing mechanical design on federal and commercial projects across the country and/or internationally, with a strong focus on timely delivery and Client satisfaction.  The successful candidate will be a self-starter with a strong desire to further their design capabilities and make significant contributions to substantial projects within a larger design initiative.

The responsibilities of this position include, but are not limited to:

• Design, including drafting, of mechanical systems for heating, ventilation and air conditioning (HVAC) systems including engineering related calculations and development of drawings.
• Develop system narratives.
• Review / Edit Specifications.
• QA/QC of Mechanical designs.
• Working under supervision of a department leader.
• Able to manage teams and projects with minimal supervision.
• Assist in proposal development.

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.

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, FAA, and many Fortune 500 companies.

Minimum Requirements

• Bachelor's degree in Mechanical Engineering and six (6) plus years of related experience, which includes an understanding of Mechanical/HVAC systems for commercial buildings, experience and skills in mechanical systems building design, project management, and team leadership or demonstrated equivalency of experience and/or education.
• Experience working with federal clients.
• Due to the nature of the work, US Citizenship is required.
• At least 4 years of experience with Energy Modeling (e.g. Trane Trace, IES, EnergyPlus, etc.).
• At least 4 years of experience with AutoCAD and Revit.

Preferred Qualifications

• Registered professional engineer (PE).
• 8+ years of related HVAC design experience.
• Full understanding and ability to complete, accurate and coordinated project design assignments with ability to review team member's work for quality and recognition of training requirements.
• Experience building HVAC infrastructure including but not limited to chilled water systems, condensing water systems, thermal distribution, hot water, steam and air side systems.
• Experience with sustainable design and energy efficiency projects.
• Successfully performed the role of a lead engineer on various projects and acted as the PM covering electrical and plumbing trades, in addition to the mechanical trade.
• Demonstrated understanding of Mechanical/HVAC systems for transportation, federal, corporate, commercial, educational, medical laboratory and sport facilities.
• Ability to work on multiple projects concurrently.
• Good interpersonal, organizational, verbal and written communication skills.
• Ability to bring energy and enthusiasm to the office.
• Eager to be part of an organization that is built to create a better world.

• Relocation assistance is available.
• Sponsorship for US Employment Authorization is not available now or in the future for this position.

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 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.