Principal Mechanical Engineer

AECOM Corporation; Dublin; Hybrid; EUR 90,000 - 120,000; Full time

Job summary

AECOM is seeking a Principal Mechanical Engineer to lead the design and delivery of complex mechanical building services in Dublin. You will guide projects across healthcare, education, rail, and data centres, coordinating with architects, engineers, and clients to ensure high-performance, sustainable outcomes.

You will mentor junior engineers, drive engineering excellence, and help grow AECOM’s Building Services practice in Ireland through innovative solutions and effective stakeholder

Qualifications

• Degree in Mechanical Engineering, Building Services Engineering, or related discipline.
• Chartered Engineer (CEng) status or working towards chartership with Engineers Ireland or equivalent.
• Extensive experience in design and delivery of mechanical building services across multiple sectors.
• Proven track record of leading multidisciplinary design teams on complex projects.
• Strong technical expertise in HVAC, public health engineering, heating/cooling plant, low-carbon tech, and sustainable building services design.
• Experience across Healthcare, Education, Rail/Transport, and Mission-critical data centres.
• Excellent communication and stakeholder management; collaborative problem-solving.
• Solid knowledge of Irish Building Regulations, CIBSE guidance, and European/UK standards.

Responsibilities

• Lead mechanical design and delivery of major building services projects across sectors.
• Provide technical leadership and ensure compliance with standards and best practices.
• Coordinate multidisciplinary design teams with electrical, structural, civil, and architectural disciplines.
• Develop energy-efficient, low-carbon building services solutions.
• Build and maintain strong client relationships and act as technical advisor.
• Manage project schedules, resources, budgets, and commercial performance.
• Review and approve calculations, reports, specs, and design docs.
• Mentor junior engineers and graduates in the team.
• Support business development through proposals and client interviews.
• Drive continuous improvement and engineering excellence across Building Services.

Skills

HVAC systems

Building services engineering

Low-carbon technologies

Sustainable design

Leadership capability

Stakeholder management

Education

Mechanical Engineering degree

Chartered Engineer (CEng) status or in progress

Job description

Company Description

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.

Job Description

Start here. Grow here.

AECOM is looking for an experienced and ambitious Principal Mechanical Engineer to join our expanding Buildings + Engineering team in Dublin. This is an excellent opportunity to take a leadership role in delivering innovative mechanical building services solutions across a diverse portfolio of projects, including healthcare facilities, education campuses, railway stations, and mission‑critical data centres.

As part of a collaborative multidisciplinary team, you will lead the design and delivery of complex engineering projects while working closely with clients, architects, contractors, and industry stakeholders. You'll play a key role in developing sustainable, high‑performing building services solutions and contribute to the continued growth and success of our Building Services business in Ireland.

Key Responsibilities

• Lead the mechanical design and successful delivery of major building services projects across the healthcare, education, transport, and data centre sectors.
• Provide technical leadership on complex projects, ensuring designs comply with Irish and international standards, regulations, and industry best practice.
• Coordinate multidisciplinary design teams, working closely with electrical, structural, civil, architectural, and specialist engineering disciplines.
• Develop innovative, energy‑efficient, and low‑carbon mechanical engineering solutions that support sustainable building design.
• Build and maintain strong client relationships, acting as a trusted technical advisor throughout all stages of project delivery.
• Manage project schedules, resources, budgets, and commercial performance to ensure successful project outcomes.
• Review and approve engineering calculations, technical reports, specifications, and design documentation.
• Mentor, coach, and support the professional development of junior engineers and graduates within the team.
• Support business development by contributing to proposals, client presentations, and project interviews.
• Drive continuous improvement initiatives and promote engineering excellence and best practice across the Building Services team.

What We're Looking For

We're seeking a highly motivated mechanical engineer with strong technical expertise, leadership capabilities, and experience delivering complex building services projects. You'll have excellent communication and stakeholder management skills, a collaborative approach to problem‑solving, and a passion for delivering sustainable engineering solutions that create lasting value for our clients and communities.

Qualifications

Ready to push the limits of what's possible?

We're looking for an experienced and driven engineering professional who is passionate about delivering high‑quality mechanical building services solutions and leading multidisciplinary teams on complex projects.

To be successful in this role, you will have:

• A degree in Mechanical Engineering, Building Services Engineering, or a related discipline.
• Chartered Engineer (CEng) status or be working towards chartership with Engineers Ireland or an equivalent recognised professional institution.
• Extensive experience in the design and delivery of mechanical building services projects across a variety of sectors.
• A proven track record of leading multidisciplinary design teams and successfully delivering complex engineering projects.
• Strong technical expertise in HVAC systems, public health engineering, heating and cooling plant, low‑carbon technologies, and sustainable building services design.
• Experience delivering projects within one or more of the following sectors:
  • Healthcare
  • Education
  • Railway stations and transport infrastructure
  • Mission‑critical data centres
• Excellent communication, leadership, and stakeholder management skills, with the ability to build strong client relationships and collaborate effectively across multidisciplinary teams.
• A thorough understanding of Irish Building Regulations, CIBSE guidance, relevant British Standards, European Standards, and industry best practice.
• Strong commercial awareness, problem‑solving abilities, and a commitment to delivering innovative, sustainable engineering solutions.

Additional Information

Interested in the role or curious about life at AECOM? Follow us on LinkedIn, Facebook, Instagram, and YouTube to explore our AECOM voices, employee stories, latest projects, and much more!

For further information about the role, reach out to the recruiter on LinkedIn Colum Calnan.

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 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 aDisabilityConfidentEmployer 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 [e-mail] if you would like to apply through theDisabilityConfidentInterview Scheme.

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

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