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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 two Senior Site Engineers (Civil Engineering IV) for our Tunnel Practice in Mississauga, ON or Markham, ON or to lead on-site construction for underground works across TBM and SEM/NATM tunnels and support of excavation, ensuring safe, compliant, and efficient delivery aligned with approved drawings, specifications, method statements, and ITPs. This is a newly created position. 

Responsibilities:

• In this role, you will coordinate day-to-day field engineering; manage RFIs and site clarifications from drafting to closeout.
•  Review temporary works, set-outs, sequencing, and hold/witness points; and maintain daily logs, photo records, and concise progress reports.
• You will verify TBM launch/arrival readiness, monitor operational parameters, and oversee segment installation quality and interventions; manage SEM headings and sequencing, shotcrete application and testing, lattice girders/steel ribs, and temporary lining with excavation class validation.
• You will inspect and control SOE systems (diaphragm/slurry walls, secant/soldier piles and lagging, sheet piles, struts/bracing, ground anchors), dewatering/groundwater management, and utilities protection, ensuring proper sequencing, preloading/lock-off, and as-built traceability.
• You will implement and track instrumentation and monitoring (settlement points, prisms, inclinometers, piezometers, extensometers, load cells), interpret trends against trigger/action thresholds, and initiate timely mitigations and design check-backs.
• Enforce QA/QC (material approvals, inspections, NCRs/SNs to closure), uphold safety and environmental controls (permits-to-work, JSAs/THAs, confined space/LOTO, noise/vibration/dust management), and coordinate proactively with geotechnical, structural, MEP, utilities, survey, contractor, designer, and client teams to resolve constraints and protect schedule and quality.

Minimum Requirements:

• BS + 6 years of relevant experience or demonstrated experience as site engineer or equivalent. 

Preferred Qualifications:

• MS in Civil or Geotechnical Engineering highly preferred.
• We value strong communication and documentation skills; proficiency with construction documents and common CDE/field tools.
• 6+ years of heavy civil/underground experience with TBM and/or SEM/NATM.
• Familiarity with monitoring data interpretation and change support (RFIs, claims inputs, time-impact analyses).
• Flexibility to work in active tunnel and shaft environments.

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 2025. Learn more at aecom.com. 

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.