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AtkinsRéalis

Senior Mechanical Engineer

Mississauga, ON, Canada

Job type: Full-time
Apply by: Oct 5, 2026
Experience: Minimum 8 Years of related work experience including 3 Years of field engineering within a heavy industrial environment with emphasis on constructability.
Posting language: English
Posted: Sep 22, 2026

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Original job description

Job Description

Overview

AtkinsRéalis is one of Canada's largest private sector nuclear engineering groups. We have been providing a wide range of services to the nuclear industry in Canada and around the world for more than 60 years. We are proud to be the steward of Canadian CANDU nuclear technology.

This position is in the Modularization & Constructability team and requires an individual who is self-motivated and capable of working independently and developing his/her career and experience in the nuclear field.

The candidate shall be able to apply mature engineering knowledge to direct and supervise other professional engineers, to plan, coordinate, and complete the assigned preassembly and constructability scopes or tasks and develop necessary engineering design documentation as required.

Your role

Perform Engineering work following AtkinsRéalis/Candu Energy QA programs, and applicable codes, standards, and regulation requirements.
Coordinate and interface with clients, suppliers, stakeholders and other design disciplines or departments to execute assigned constructability engineering work.
Involve in conceptual, preliminary, and/or detailed design of CANDU off-site pre-assembly and construction packages.
Participate in development of construction methods and sequences for nuclear equipment and piping skids.
Develop plans for off-site pre-fabrication, pre-assembly, transportation, and installation for equipment and piping skids.
Review technical documents including drawings, constructability reports, and procedures.
Develop technical reports such as constructability, risk-review, and assessment reports for preassemblies.
Develop or support construction plans including but not limited to sequence strategies, schedule, and MTO.
Prepare technical documents, such as engineering drawings (including GA, ISO, pipe supports, flow diagrams), calculations, design/analysis reports, design requirements, design manuals, bill of materials, design specifications, technical specifications, data sheets, system classification lists, code classifications, commissioning specifications, etc.
Prepare requisitions or Engineering Quotation Requests (EQR) for equipment and materials to support module fabrication and procurement.
Review supplier technical documents and perform technical bid analyses.
Provide technical guidance and instruction to Engineers, Designers/Drafters and more junior staff as required.
May be requested by Engineering Manager to lead technical packages with a small or large team of Engineers, Designers, and Coordinators.
Perform site visits to client and supplier shops as required.
Perform field walk-downs during different design phases as required.
Support field construction and execution activities, such as field changes, design revisions, commissioning, AFS, closeout, etc.
Provide prompt response and engineering resolutions on any critical engineering related matters.
Complete the assigned scopes or tasks within a given budget and schedule, and in good quality.

About you

Engineering Degree in Mechanical from an accredited university or equivalent degree as recognized by Professional Engineers Ontario (PEO).
Having a P.Eng. license for this position is mandatory.
Qualified or eligible to be qualified as ASME Appendix XXIII is an asset.
Minimum 8 Years of related work experience including 3 Years of field engineering within a heavy industrial environment with emphasis on constructability.
Preassembly/offsite work experience is a must. Nuclear work experience is an asset.
Design engineering experience in nuclear class 1, 2, 3 and 6 piping systems, valves, and pumps for Nuclear Power Plants is an asset.
Experience in AutoPipe, MATLAB, MathCAD, ANSYS Mechanical (APDL preferred or Workbench), and LS-DYNA, or other similar software programs is an asset.
Site Experience in construction, or commissioning of plant mechanical and structural systems for nuclear or other heavy industries would be an asset.
Working knowledge of MS Excel advanced tools and other database applications.
Working knowledge of CSA N285.0, CSA B51, CSA N289, ASME Section III and ANSI B31.1 codes, and any other applicable standards or regulatory guides related to permanent plant components, pressure boundary equipment, and/or reactor systems is preferred.
Knowledge of AutoCAD, and 3D Model reviewer such as Navisworks.
Must have knowledge of mechanical, structural and piping systems or equipment (knowledge of CANDU nuclear systems would be an asset).
Shall have excellent technical document reviewing and writing skills.
Must be able to apply technical principles in a logical and practical manner to resolve engineering issues or technical problems.
Must be willing to become a Nuclear Energy Worker (NEW), although this will not be a regular requirement as part of the job.
Demonstrate good interpersonal skills and the ability to work in a multidisciplinary team environment.
Excellent leadership, communication, and stakeholder management skills.

Rewards & benefits

Explore the rewards and benefits that help you thrive – at every stage of your life and your career at AtkinsRéalis in Canada.

Enjoy competitive compensation, employee recognition, and a brilliant range of flexible benefits you can tailor to your health, wellbeing, financial and lifestyle needs.

Make the most of diverse opportunities for training and professional development to grow your skills and expertise.

And take advantage of our hybrid working culture and generous time-off policies to balance a fulfilling career with your personal life.

Be rewarded. Find out more.

About AtkinsRéalis

We're AtkinsRéalis, a world-class engineering services and nuclear organization. We connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants, designers, engineers and project managers, we can change the world. We're committed to leading our clients across our various end markets to engineer a better future for our planet and its people.

Find out more.

Additional information

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 know 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.

Appropriate accommodation will be provided upon request throughout the recruitment and hiring process as required by Company policy and the Accessibility for Ontarians with Disabilities Act (AODA).

Successful applicants will be notified about AtkinsRéalis’ accommodation policies at the time the employment offer is extended, and the information will be shared with new personnel during the onboarding process.

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.

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More about this job

Responsibilities

The Senior Mechanical Engineer will direct and supervise engineering tasks related to modularization and constructability for nuclear projects. They will coordinate with stakeholders, develop technical documentation, and provide guidance to junior staff to ensure project quality and schedule adherence.

Requirements

Candidates must hold a Mechanical Engineering degree and a mandatory P.Eng. license in Ontario. A minimum of 8 years of experience in heavy industrial environments, specifically with constructability and preassembly, is required.

Skills

Mechanical engineering
Nuclear engineering
Constructability
Project management
Technical documentation
Piping systems
AutoCAD
Navisworks
AutoPipe
ANSYS Mechanical
Leadership
Stakeholder management
Quality assurance
Construction planning
Risk assessment
Field engineering

Benefits

Competitive compensation
Employee recognition
Flexible benefits
Training and professional development
Hybrid working culture
Generous time-off policies

Visa sponsorship

Not detected in the job text

Keywords

Mechanical Engineer
Nuclear
CANDU
Modularization
Constructability
P.Eng.
ASME
CSA N285.0
CSA B51
ANSI B31.1
AutoPipe
MATLAB
MathCAD
ANSYS Mechanical
LS-DYNA
AutoCAD
Navisworks
Piping systems
Pressure boundary equipment
Commissioning
Technical bid analysis
Engineering drawings
Bill of materials
Quality assurance
Heavy industry
Field engineering
Project management
Stakeholder management
Risk review
Nuclear Energy Worker

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