Senior 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 seeking a motivated and skilled Senior Mechanical Engineer to support the design and construction of buildings within the Buildings + Places (B+P) business line. This opportunity can be based out of our Markham, Mississauga, or Pickering offices, with opportunities for hybrid work available. This is a new role for the team.

This is an exciting opportunity for a Senior-level Mechanical Engineer with extensive experience in building systems to serve as the Technical Lead and Job Captain for the Mechanical Discipline on multi-discipline projects for the Defence and Transportation Market Sectors. The role also involves mentoring junior staff, contributing to technical excellence, and supporting project delivery across a wide range of building typologies.

About AECOM Buildings + Places Canada (B+P Canada):

B+P Canada is a vibrant and growing fully integrated team spanning architecture, all building engineering disciplines, landscape architecture, urban planning, urban design, economics, and asset management for design and infrastructure projects.

Major Responsibilities

As a Senior Mechanical Engineer, you will:

• Lead the design of Plumbing, Fire Protection, and HVAC systems for complex building projects.
• Serve as the Technical Lead for the Mechanical Discipline, providing specialized technical input and oversight on studies, designs, and construction documentation.
• Review and prepare HVAC design concepts, layouts, and calculations, ensuring compliance with project requirements and industry standards.
• Develop plumbing system layouts, including domestic water distribution, sanitary drainage, venting, storm drainage, and specialty systems such as oil grit interceptors and trench drains.
• Provide fire suppression indicative design, including wet/dry sprinkler systems, standpipes, clean agent systems, and specialized suppression systems for unique applications (e.g., hangars).
• Oversee Building Automation System (BAS) design and ensure seamless integration with other building systems.
• Perform quality control reviews of design calculations, drawings, and technical specifications to ensure high-quality deliverables.
• Prepare and review technical specification sections and contribute to the development of engineering budgets and schedules.
• Collaborate with interdisciplinary teams to ensure seamless coordination across all building systems.
• Mentor and provide guidance to junior engineers and technicians, fostering a culture of continuous learning and technical excellence.
• Actively participate in construction administration, including reviewing submittals, responding to RFIs, and conducting site visits to ensure project compliance with design intent.
• Support the preparation of technical reports and deliver results in a clear and concise manner to both technical and non-technical stakeholders.

Key Technical Expertise

The ideal candidate will have expertise in:

• HVAC Design and Construction Administration:

• Hydronic heating and cooling systems.
• Duct air distribution and terminal/central airside equipment selection.
• Net-zero heating and cooling solutions.
• General HVAC best practices.

• Plumbing Design and Construction Administration:

• Plumbing fixture selection and optimization of domestic water distribution.
• Sanitary and storm drainage systems.
• Specialty drainage systems (e.g., oil grit interceptors, trench drains).
• Domestic hot water production systems.

• Fire Suppression Design and Construction Administration:

• Wet and dry sprinkler systems.
• Standpipes and clean agent gas/aerosol systems.
• Specialized fire suppression systems for unique applications.

• Building Automation Systems (BAS):

• Design and integration of BAS for efficient building operations.

Minimum Requirements:

• Bachelor's Degree in Mechanical Engineering.
• Minimum 6 years of experience in designing HVAC, plumbing, and fire protection systems for commercial, institutional, and light industrial facilities.
• Demonstrated equivalency of experience and/or education may be considered.

Preferred Requirements:

• Professional Engineering (P.Eng.) license is strongly preferred.
• PWGSC/PSPC - Level II Secret Clearance preferred for Federal Projects.
• Proficiency in AutoCAD, MicroStation, and REVIT for 2D and 3D design and drafting.
• Experience with Carrier HAP, Trane Trace, or Design Builder
• Strong communication skills (spoken and written) with the ability to present technical concepts to diverse audiences.
• Experience with mechanical system installation, service and maintenance requirements.
• Experience mentoring junior staff and contributing to team development.
• Familiarity with sustainable design practices and net-zero building solutions.

• Relocation is not available for this position.
• Sponsorship for Canadian employment authorization is not available for this position.

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. Artificial intelligence will be used to support the screening, assessment, and selection of applicants for this role. Final hiring decisions are made by the hiring team.