Principal Mechanical Engineer

AECOM; Dublin; On-site; EUR 90,000 - 120,000; Full time

Job summary

AECOM in Dublin is seeking an experienced Principal Mechanical Engineer to lead the mechanical building services design across a diverse portfolio including healthcare, education, transport and data centres. You’ll drive technical excellence, mentor junior engineers, and coordinate with electrical, civil and architectural teams to deliver high‑performing, sustainable solutions.

Join a global team delivering projects that shape communities, with leadership responsibility for design quality,

Qualifications

• Degree in Mechanical Engineering, Building Services Engineering, or related field.
• Chartered Engineer (CEng) status or pursuing chartership with Engineers Ireland.
• Extensive experience in design and delivery of mechanical building services.
• Proven track record leading multidisciplinary design teams.
• Strong HVAC, public health engineering, heating/cooling, and low-carbon tech expertise.
• Experience delivering projects across multiple sectors.

Responsibilities

• Lead mechanical design and delivery of major building services projects.
• Provide technical leadership ensuring designs meet standards.
• Coordinate multidisciplinary design teams with electrical, structural, civil, architectural, and specialist engineering disciplines.
• Develop energy‑efficient, low‑carbon mechanical engineering solutions.
• Build and maintain client relationships as trusted technical advisor.
• Manage project schedules, resources, budgets, and commercial performance.
• Review and approve calculations, reports, specifications, and design documentation.
• Mentor and support development of junior engineers.
• Support business development with proposals and client presentations.
• Promote engineering excellence and best practices.

Skills

Mechanical design

HVAC expertise

Leadership

Stakeholder management

Building services

Mentoring

Education

Degree in Mechanical Engineering

Job 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.

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