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Senior Mechanical Engineer

  • Mississauga, ON
  • On-site
  • Posted Oct 15, 2026
  • 1 position

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Employment type
Full-time
Experience level
Lead · 10+ years
Minimum education
Bachelor’s degree
Apply by
Jan 1, 2027
Posting language
English
Working hours
40 hours per week

Job summary

Lead and review engineering design, calculations, specifications, and other technical deliverables for nuclear power plant systems, while coordinating multidisciplinary work and resolving technical issues. Support engineering changes throughout their lifecycle, procurement and supplier activities, manufacturing and site work, regulatory and quality compliance, project reporting, and the development of junior staff.

Job details

Job Description Are you looking for a company that works on major engineering projects all over the world? Do you want to make a difference by improving the daily lives of communities worldwide? Are you seeking to join an inclusive and diverse team that you can truly count on? You’ve come to the right place! Come join us in reshaping the future with AtkinsRéalis. AtkinsRéalis is dedicated to engineering a better future for our planet and its people. Job Description AtkinsRéalis is looking to hire a Senior Engineer. This position requires an experienced, self-motivated professional capable of working independently, leading complex engineering activities, and providing technical guidance to junior staff. The successful candidate will work in a fast-paced, multidisciplinary team environment delivering engineering services for nuclear power plants within a matrix organization. Job Responsibilities: Prepare and review engineering documents, calculations, specifications, reports, drawings, procedures, and other technical deliverables. Lead conceptual, preliminary, and detailed design activities for nuclear power plant systems, structures, and components. Define engineering scope, technical requirements, deliverables, budgets, schedules, and resource needs. Coordinate multidisciplinary engineering activities and resolve technical and interface issues with clients, suppliers, project teams, and other stakeholders. Support engineering changes through the applicable engineering change control processes, from concept development through implementation, commissioning, closeout, and availability for service. Perform and review technical assessments, calculations, design evaluations, and verification activities in accordance with applicable procedures. Provide pre-order and post-order engineering support, including preparation of procurement documents, technical bid evaluations, supplier document reviews, and resolution of design deviations and non-conformances. Support manufacturing, fabrication, assembly, testing, installation, commissioning, and field activities, including site and supplier visits as required. Ensure work complies with applicable codes, standards, regulatory requirements, quality-assurance requirements, and client and company procedures. Interface directly with client engineering representatives and communicate technical matters clearly to peers, management, suppliers, and other stakeholders. Monitor and report on engineering progress, performance, risks, issues, and staffing needs to engineering and project management. Mentor junior engineers and technical staff, provide technical guidance, and contribute to knowledge transfer and continuous improvement. Why choose AtkinsRéalis as an employer? Because we offer: The opportunity to work on various major projects for internal and external clients. An exciting environment where work-life balance is important. A wide array of learning and development opportunities. Competitive pay, flexible benefits, an employee share plan, and a defined contribution pension plan. A work environment focused on health and safety. About You Bachelor’s degree in an applicable engineering discipline from an accredited university. Registered Professional Engineer in a province of Canada and a member in good standing, or eligible for registration. A minimum of 15 years of relevant engineering experience, including significant experience in the nuclear industry and in a senior design or technical role. Demonstrated experience delivering modifications or engineering work for nuclear facilities through the full engineering lifecycle. Strong knowledge of applicable nuclear codes, standards, regulatory requirements, engineering change control processes, and quality-assurance practices. Demonstrated ability to prepare and review complex engineering deliverables and perform or oversee design verification. Experience coordinating multidisciplinary work and interfacing with clients, suppliers, project teams, and regulatory or authorized inspection organizations, as applicable. Strong technical leadership, problem-solving, organizational, and decision-making skills. Excellent written and oral communication skills, with the ability to present technical information clearly. Results-driven, self-motivated, and able to work independently and collaboratively in a matrix organization. Willingness to travel to and potentially work at project, client, or supplier sites to meet business needs. Additional, preferred qualifications: Advanced degree in an applicable engineering discipline. Experience with pressure-boundary systems or components, equipment qualification, seismic or environmental qualification, design registration, or other specialized nuclear engineering activities. Qualification or recent experience as a Specialized Professional Engineer under an applicable code or standard. Experience supporting procurement, manufacturing, fabrication, testing, installation, commissioning, and field engineering activities. Knowledge of configuration management, systems engineering, constructability, operability, maintainability, and lifecycle considerations. Strong presentation, facilitation, mentoring, and public-speaking abilities. Are you up for this challenge? Apply today and join our team to help engineer a Better Future for our Planet and its People. About AtkinsRéalis Created by the integration of long-standing organizations dating back to 1911, AtkinsRéalis is a world-leading professional services and project management company dedicated to engineering a better future for our planet and its people. We create sustainable solutions that connect people, data, and technology to transform the world’s infrastructure and energy systems. We deploy global capabilities locally to our clients and deliver unique end-to-end services across the entire life cycle of an asset, including consulting, advisory and environmental services, intelligent networks and cybersecurity, design and engineering, procurement, project and construction management, operations and maintenance, decommissioning, and capital. The breadth and depth of our capabilities are delivered to clients in key strategic sectors such as Engineering Services, Nuclear, Operations and Maintenance, and Capital. At AtkinsRéalis, we seek to hire individuals with diverse characteristics, backgrounds, and perspectives. We strongly believe that world-class talent makes no distinctions based on gender, ethnic or national origin, sexual identity and orientation, age, religion, or disability, but enriches itself through these differences. AtkinsRéalis cares about your privacy. AtkinsRéalis and other subsidiary or affiliated companies of AtkinsRéalis (referred to throughout as “AtkinsRéalis”) are committed to protecting your privacy. Please consult our Privacy Notice on our Careers site to learn more about how we collect, use, and transfer your Personal Data. By submitting your personal information to AtkinsRéalis, you confirm that you have read and accept our Privacy Notice Worker Type Employee Job Type Regular At AtkinsRéalis, we seek to hire individuals with diverse characteristics, backgrounds and perspectives. We strongly believe that world-class talent makes no distinctions based on gender, ethnic or national origin, sexual identity and orientation, age, religion or disability, but enriches itself through these differences.

What you’ll do

Lead and review engineering design, calculations, specifications, and other technical deliverables for nuclear power plant systems, while coordinating multidisciplinary work and resolving technical issues. Support engineering changes throughout their lifecycle, procurement and supplier activities, manufacturing and site work, regulatory and quality compliance, project reporting, and the development of junior staff.

Requirements

Requires a bachelor's degree in an applicable engineering discipline, professional engineer registration in a Canadian province or eligibility for registration, and at least 15 years of relevant experience, including significant nuclear industry experience in a senior design or technical role. Candidates should have strong knowledge of nuclear codes, standards, regulatory and quality requirements, engineering change processes, design verification, and multidisciplinary coordination; an advanced degree and specialized nuclear engineering experience are preferred.

Benefits

  • Flexible Benefits
  • Employee Share Plan
  • Defined Contribution Pension Plan
  • Learning And Development Opportunities
  • Work-Life Balance

Listed skills

  • Multidisciplinary Coordination · Preferred
  • Quality assurance · Preferred
  • Regulatory Compliance · Preferred

Other relevant skills

Identified from the job description. Confirm important requirements above.

  • Nuclear Engineering
  • Mechanical Engineering
  • Engineering Design
  • Technical Leadership
  • Engineering Change Control
  • Design Verification
  • Technical Calculations
  • Multidisciplinary Coordination
  • Client And Supplier Relations
  • Procurement Support
  • Quality Assurance
  • Regulatory Compliance
  • Project Scheduling And Budgeting
  • Risk And Issue Management
  • Mentoring
  • Technical Communication
  • Energy Systems
  • Technical Requirements
  • Knowledge Transfer
  • Self-Motivation
  • Intelligent Networks
  • Systems Engineering
  • Management
  • Decision Making
  • Configuration Management
  • Procurement
  • Constructability
  • Construction Management
  • Consulting
  • Continuous Improvement Process
  • Cyber Security
  • Engineering Design Process
  • Engineering Change Order
  • Engineering Support
  • Public Speaking
  • Problem Solving
  • Matrix Management
  • Project Management
  • Mentorship
  • Operability
  • Operations
  • Presentations
  • Verbal Communication Skills
  • Coordinating
  • Commissioning

Job areas

  • Engineering
  • Energy
  • Management & Leadership
  • Mechanical Engineer
  • Mechanical Engineer (General)
  • Mechanical Engineers

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