Principal Mechanical Engineer

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 a leading multidisciplinary consultancy seeking a Principal Mechanical Engineer in Cardiff.

You’ll bring proven mechanical building services design experience across Healthcare and Education projects, hold a degree in Mechanical Engineering/Building Services, and be working toward Chartered status. We’re looking for someone ambitious, self-motivated, and ready to take the next step in their career.

We’re at the forefront of the net zero agenda — helping NHS Wales and Health Boards understand and deliver Net Zero, including net zero carbon hospitals and education buildings.

Over the past five years, we’ve delivered more than 100 local refurbishment projects, alongside award winning healthcare and higher education schemes supported by our Cardiff-based team. Our local specialists are also contributing to several schemes within the UK’s New Hospital Programme, a long-term government initiative to replace outdated hospital buildings with modern, digitally enabled facilities.

Join a team trusted to combine top talent, technical excellence, and digital innovation across buildings, transport, water, environment, and energy.

Based in our Cardiff office, you will lead the delivery of small to large-scale Healthcare and Higher Education projects across the UK.

This role combines technical leadership, client engagement, and team development, suited to an experienced and motivated engineer looking to progress their career with AECOM.

Here’s what you’ll do:

• Lead Mechanical teams delivering Healthcare and Education projects to quality, time, and budget
• Manage bids, client relationships, and represent the business at meetings and interviews
• Mentor and develop junior engineers while coordinating multi-disciplinary teams
• Oversee BIM/Revit-led design production, ensuring fully coordinated and compliant solutions
• Manage project resources, QA procedures, statutory approvals, and contractor engagement
• Ensure compliance with project programmes, safety, health and environmental standards

Come grow with us:

And let's not forget about the perks at AECOM. You'll enjoy a range of core and personalised benefits designed to support your future and well-being, customized to fit your lifestyle. Take advantage of career development opportunities, our flexible hybrid working model to ensure a work-life balance that suits your lifestyle, technical practice networks, AECOM University, and volunteering days.

Ready to push the limits of what’s possible?

Requirements:

• Proven experience in mechanical building services design within consultancy, particularly in the healthcare and/or education sectors.
• Previous experience working as a Senior or Principal Engineer.
• Membership of a relevant professional body (e.g., CIBSE, ASHRAE, or EI).
• Good understanding of mechanical building services design software and BIM tools (e.g., Revit, IES).
• Degree in Building Services Engineering or Mechanical Engineering.
• Chartered status or working towards professional accreditation (desirable).
• Experience in the design and delivery of healthcare facilities, with familiarity of HTM/HBN standards (preferred).

About AECOM

AECOM is the world’s trusted infrastructure consulting firm, delivering professional services throughout the project lifecycle – from advisory, planning, design and engineering to program and construction management. On projects spanning transportation, buildings, water, new energy and the environment, our public- and private-sector clients trust us to solve their most complex challenges. Our teams are driven by a common purpose to deliver a better world through our unrivaled technical and digital expertise, a culture of equity, diversity and inclusion, and a commitment to environmental, social and governance priorities. AECOM is a Fortune 500 firm and its Professional Services business had revenue of $16.1 billion in fiscal year 2025. See how we are delivering sustainable legacies for generations to come at aecom.com and @AECOM.

Freedom to Grow in a World of Opportunity 

You will have the flexibility you need to do your best work with hybrid work options. Whether you’re working from an AECOM office, remote location or at a client site, you will be working in a dynamic environment where your integrity, entrepreneurial spirit and pioneering mindset are championed.

You will help us foster a safe and respectful workplace, where we invite everyone to bring their whole selves to work using their unique talents, backgrounds and expertise to create transformational outcomes for our clients.

AECOM provides a wide array of compensation, benefits and well-being programs to meet the diverse needs of our employees and their families. We’re the world’s trusted global infrastructure firm, and we’re in this together – your growth and success are ours too.

Join us, and you’ll get all the benefits of being a part of a global, publicly traded firm – access to industry-leading technology and thinking and transformational work with big impact and work flexibility. As an Equal Opportunity Employer, we believe in each person’s potential, and we’ll help you reach yours.

We are a Disability Confident Employer and will offer an interview to applicants who have a disability or long-term condition, who meet the minimum/essential criteria for the role. Please let us know using this email address [email protected]  if you would like to apply through the Disability Confident Interview Scheme.

All your information will be kept confidential according to EEO guidelines.