Senior Mechanical Engineer

Mississauga, Ontario, Canada

The Senior Mechanical Engineer will support refurbishment, retube, field services, and new‑build nuclear projects. This role combines design engineering expertise with field execution support, providing technical leadership throughout the full lifecycle of tooling, equipment, and mechanical systems from concept development through deployment, commissioning, maintenance, and field operations.

The successful candidate will lead complex engineering assignments, support tooling and field execution activities, mentor junior staff, and interface with clients, suppliers, and site personnel to ensure safe, reliable, and efficient project delivery.

Your role within the team

• Lead conceptual, preliminary, and detailed mechanical design activities for Retube Tooling, specialized equipment, and field service systems.
• Execute and oversee engineering work packages supporting refurbishment, retube, maintenance, outage, and new‑build projects.
• Provide technical leadership for design, procurement, fabrication, assembly, testing, commissioning, deployment, and field implementation activities.
• Support field execution teams by resolving technical issues, developing corrective actions, and providing engineering guidance during equipment installation, operation, maintenance, and troubleshooting.
• Prepare and review engineering deliverables including design requirements, design descriptions, technical specifications, calculations, drawings, test procedures, commissioning plans, operating instructions, and design change packages.
• Perform and verify engineering analyses related to machine design, structural integrity, mechanisms, materials, hydraulics, pneumatics, lifting systems, and pressure‑retaining components.
• Coordinate and lead multidisciplinary teams consisting of engineers, technologists, designers, manufacturing personnel, suppliers, and field staff.
• Interface directly with clients, vendors, contractors, and station personnel to define requirements and resolve technical challenges.
• Mentor and provide technical oversight to junior engineers, designers, and technologists.
• Travel periodically to customer sites and nuclear generating stations to support installation, commissioning, outage execution, inspections, and troubleshooting activities.

Why choose AtkinsRéalis as an employer?

• Opportunity to work on major nuclear refurbishment, retube, field services, and new‑build projects.
• Exposure to both engineering design and field implementation activities.
• Career growth through leadership, mentoring, and technical specialization opportunities.
• Competitive compensation, flexible benefits, employee share plan, and defined contribution pension plan.
• Strong commitment to safety, quality, innovation, and professional development.
• Collaborative environment that values technical excellence and work‑life balance.

About You

• Bachelor's degree in Mechanical Engineering, Mechatronics Engineering, or equivalent.
• Registered Professional Engineer (P.Eng.) in Ontario, or eligible for registration.
• Typically 8‑12 years of experience in mechanical design, tooling, equipment, automation, field engineering, or nuclear projects.
• Strong understanding of machine design, mechanics of materials, manufacturing methods, and mechanical system integration.
• Experience leading engineering tasks and coordinating multidisciplinary teams.
• Experience supporting field execution, commissioning, maintenance, outage, or refurbishment activities is an asset.
• Familiarity with nuclear industry codes and standards including ASME and CSA requirements is an asset.
• Experience with 3D CAD software such as SolidWorks, Solid Edge, Creo, or Inventor.
• Excellent communication, problem‑solving, and technical leadership skills.

• Excellent problem‑solving, communication, leadership, and stakeholder management skills.
• Ability to obtain and maintain nuclear security clearance and access authorization.

Are you up for the challenge? Apply today and join our team to help engineer a Better Future for our Planet and its People.

Why choose AtkinsRéalis?

Wherever you are in your career – and whoever you are – AtkinsRéalis is for you. Here, support and collaboration are a vibrant part of a culture that lets you choose where – and how far – your career can go. Take on projects that push boundaries and drive sustainable impact, surrounded by colleagues who believe there's no limit to how brilliant you can be. It's time to join a like‑minded team where you'll be rewarded, supported, and free to be your kind of brilliant.