Lead Mechanical/Nuclear Systems Engineer

Lead Mechanical/Nuclear Systems Engineer

Work Location: Waterloo, ON

About Canadian Strategic Missions Corp. (CSMC)
Canadian Strategic Missions Corporation is building the capabilities that will shape Canada's future in space, defence, and energy. We focus on developing dual use systems that address critical challenges here on Earth while enabling sustained human activity beyond it.

Ina short time, CSMC hasestablishedreal momentum. WE have secured significant government investment to advance next generation micro nuclear reactors in partnership with leading institutions, alongside expanding a portfolio of technologies designed for remote environments, national defence, and future space missions. These efforts reflect a broader ambition to deliver reliable power and critical infrastructure where it matters most.
Our work is grounded in close collaboration with government and guided by a clear sense of purpose: to build sovereign capability at a time when it has never been more important. We care deeply about execution, long term impact and earning the trust required to deliver systems that will service Canada and its allies for decades.

CSMC is a company for builders. We are a group of people drawn to hard problems, meaningfulimpactand the opportunity to shape systems that matterata national and global scale. We are building a team that thrives in ambiguity, values execution, and is motivated by mission and impact.

About the Role

CSMC is developing amicroreactor for strategic and remote applications. We are hiring a Lead Mechanical and Nuclear Systems Engineer to take ownership of the mechanical and pressure boundary design for core reactor subsystems. This includes the Reactor Pressure Vessel, the primary pressurized loop, and the emergency cooling systems.

This is a technical leadership role. It is not a people management position, although the successful candidate may eventually supervise a small group as the program grows. The focus is on strong engineering judgment, disciplined design work, and the ability to guide mechanical and nuclear systems development from early concept through detailed design.

Key Responsibilities

Reactor Pressure Vessel and Primary Loop Design

• Lead the mechanical design of the Reactor Pressure Vessel using analysis and simulation results from the nuclear science team
  
• Define interfaces for instrumentation and control, penetrations, nozzles, and structural integration
  
• Own the design of the primary pressurized loop including piping, valves, pumps, heat exchangers, and other pressure boundary components
  
• Lead the design of emergency cooling systems including passive and active heat removal pathways
  

Pressure Boundary Engineering and Code Compliance

• Develop designs that comply with the following codes and standards
• ASME Section III Class 1, 2, and 3
  
• ASME Section VIII
  
• CSA N285
  
• CSA N286 and N299
  
• Perform or oversee stress analysis, thermal hydraulic integration, materials selection, and fabrication considerations
  

Systems Integration and Technical Leadership

• Serve as the technical lead for mechanical and nuclear systems across the microreactor program
  
• Work closely with neutronics, thermal hydraulics, instrumentation and control, and safety engineering teams
  
• Translate simulation results into mechanical design requirements
  
• Lead design reviews, hazard analyses, and configuration control for mechanical systems
  

Design Documentation and Engineering Governance

• Produce engineering drawings, specifications, design reports, and code compliance documentation
  
• Support early licensing documentation including design descriptions and safety basis inputs
  
• Help establish early engineering processes, standards, and design control practices

Prototyping, Testing, and Vendor Engagement

• Support fabrication planning, prototyping, and supplier qualification for pressure boundary components
  
• Work with vendors on manufacturability, materials, inspection methods, and quality requirements
  

Required Qualifications

Technical Background

• Degree in Mechanical Engineering, Nuclear Engineering, or a related field
  
• Seven to fifteen years of experience in mechanical or nuclear systems design for pressure boundary components
  
• Experience with pressure vessel design, piping and loop systems, heat transfer components, high pressure and high temperature systems, and safety critical mechanical systems

Code and Standards Expertise

• Hands on experience with ASME Section III, ASME Section VIII, CSA N285, and CSA N286 and N299
  
• Experience preparing code compliant design documentation and calculations
  

Engineering Leadership

• Proven ability to act as a technical lead on complex mechanical or nuclear systems
  
• Experience leading design reviews and guiding junior engineers
  

Preferred Experience

• Experience with microreactors, small modular reactors, or advanced reactor concepts
  
• Experience with thermal hydraulic analysis tools such as RELAP5, TRACE, or MOOSE based codes
  
• Familiarity with defence sector engineering environments
• Naval nuclear design experience
• Experience with emergency cooling systems, passive safety systems, or high reliability mechanical systems
  

Why Join CSMC

CSMC is building technologies that will shape Canadas future in energy, space, and national security.Youlljoin a team of engineers, scientists, and missiondriven builders who care deeply about solving hard problems that matter. We move quickly, support each other, and take pride in doing work that hasrealimpact. Along the way,youllhave access to competitive compensation, benefits, and equity, and the chance to grow with a company that values ownership, curiosity, and technical excellence.

Employment Eligibility
CSMC works withhighly sensitivenuclear, defence, and aerospace technologies, and all roles require eligibility for federal security screening and compliance with controlled goods and export regulations. Candidates must be legally authorized to work in Canada, able to obtain andmaintainGovernment of Canada security clearance, and eligible to meet foreign affiliation and export control requirements. These conditions aremandatoryBona Fide Occupational Requirements and reflect the need to securely develop and protect nationally significant capabilities.