Senior HVAC Design Engineer – Building Services

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.

At AECOM Spain, our Building Services Engineering team is made up of highly qualified professionals who deliver smart, efficient solutions to international clients across a wide range of sectors.

We design mechanical, electrical, and public health (MEP) systems that ensure buildings operate safely, comfortably, and sustainably. As part of our continued growth, we're looking for a Senior HVAC Design Engineer to lead and deliver high-quality mechanical engineering projects.

This role is ideal for someone with solid experience in HVAC design who wants to stay hands-on, take ownership of technical solutions, and work on complex projects in sectors such as Industrial, Healthcare, Education, Aviation, Commercial, and Defense.

What you'll do:

• Lead the technical design of HVAC systems throughout the full project lifecycle.
• Coordinate with electrical engineers, architects, and other disciplines.
• Perform HVAC calculations and system analysis using tools like Carrier HAP (knowledge of IES is a plus).
• Review design drawings, conduct field investigations, and evaluate cost-effective alternatives.
• Develop technical specifications, BoQs, plans, elevations, sections, and detailed drawings.
• Ensure compliance with relevant codes, regulations, and engineering standards.
• Participate in site visits and construction inspections when needed.
• Maintain regular communication with clients and stakeholders to ensure alignment and collaboration.
• Clearly communicate complex system solutions, especially in early design phases.

Why AECOM?

You'll be part of a global company with a strong local presence, working on technically challenging projects that make a real impact. We value expertise, autonomy, and collaboration—and we offer the opportunity to grow professionally while staying close to the technical side of engineering.

What we offer:

• A hybrid working model (2–3 days/week in the Barcelona office, depending on project needs).
• Flexible working hours to support work-life balance.
• The opportunity to grow your career within a global company, collaborating with key stakeholders across AECOM's international network.
• A very positive and collaborative working environment, where teamwork and mutual support are part of our culture.

What we're looking for:

• Degree in Mechanical Engineering or a related field.
• At least 10–12 years of experience in HVAC / Mechanical Design Engineering.
• Strong knowledge of international standards (RITE, ASHRAE, IMC, etc.).
• Experience in Plumbing and Fire Protection systems is a plus.
• Proficiency in Revit and BIM workflows is an asset.
• Fluent in English, Spanish, and Catalan (spoken and written).
• Strong communication skills and ability to work in multidisciplinary teams.
• Leadership capabilities and a proactive approach to problem-solving.

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 2024. 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, 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.