Position: Nuclear Engineer (Neutronics Specialist)

Location: Waterloo, Ontario (On site, five days per week)

About CSMC

Canadian Strategic Missions Corporation is developing advanced energy and aerospace technologies that include nuclear microreactors for space and extreme environments, quantum sensing platforms, and mission critical deep tech systems. We are hiring a Nuclear Engineer with strong neutronics and reactor physics expertise to join our reactor design team and help build the physics foundation of our micro modular reactor programs.

This is a hands on technical role in a fast moving environment. You will develop high fidelity neutronics models, run transport and diffusion simulations, support multiphysics integration, and contribute to first of a kind reactor concepts.

About the Role

You will work on neutron transport simulations, core physics modeling, reactivity and kinetics evaluations, fuel cycle and burnup analysis, multiphysics coupling with thermal hydraulics and structural teams, benchmark and validation work, and nuclear data processing. You will collaborate closely with engineering, safety, and program teams to produce defensible and auditable reactor physics outputs suitable for a regulated environment.

Key Responsibilities

Neutronics and Reactor Physics

• Perform neutron transport and reactor physics simulations using Serpent2, OpenMC, MCNP, SCALE, DRAGON, MOOSE based solvers, or other neutronics and nodal diffusion codes

• Build and maintain high fidelity core, lattice, reflector, and shielding models for microreactor concepts

• Conduct reactivity coefficient evaluations, power distribution studies, burnup and depletion analysis, kinetics assessments, and control system behavior studies

• Support core design optimization, fuel selection, reflector and shielding design, and neutronic performance trade studies

Multiphysics and Safety Integration

• Work with thermal hydraulics engineers on coupled neutronics and thermal hydraulics analysis

• Provide neutronics inputs for safety analysis, transient behavior, and extreme environment performance assessments

Nuclear Data and Verification

• Process and interpret nuclear data libraries including ENDF B, JEFF, and JENDL

• Perform sensitivity and uncertainty analysis using tools such as SCALE SAM or TSUNAMI

• Conduct benchmark comparisons including ICSBF, Serpent benchmarks, MCNP benchmarks, and critical experiments

Documentation and Communication

• Prepare technical reports, calculation packages, and design documentation suitable for regulated and auditable environments

• Present findings in internal design reviews and to external stakeholders

Qualifications

Required

• Bachelor’s, Master’s, or PhD in Nuclear Engineering, Engineering Physics, Reactor Physics, or a related field

• At least two years of relevant experience in industry, research, or graduate level work

• Demonstrated experience with at least one major neutronics code including: OpenMC, Serpent2, MCNP, SCALE, DRAGON, the MOOSE suite, or other named neutronics and nodal diffusion codes

• Strong programming and automation skills in Python, MATLAB, or similar tools

• Solid understanding of reactor physics fundamentals including cross sections, transport theory, diffusion theory, burnup, kinetics, and reactivity feedback

• Ability to produce clear and defensible technical documentation

Nice to Have

• Experience with microreactors, space reactors, or fast spectrum systems

• Experience with multiphysics coupling such as OpenMC MOOSE or Serpent CFD workflows

• Familiarity with nuclear safety analysis, extreme environment reactor design, or shielding analysis

• Experience with high performance computing environments

• Knowledge of CSA N286 or N299, NQA 1, or other regulated quality frameworks

Why Join CSMC

You will work on first of its kind microreactor systems for space and extreme environments. You will help build foundational reactor physics capability in a high growth deep tech company. You will collaborate with engineers across nuclear, aerospace, quantum, and AI. You will have meaningful ownership, a flat structure, and the opportunity to grow with a mission driven team.

Employment Eligibility

CSMC works with highly sensitive nuclear, defence, and aerospace related technologies. As a result, all CSMC positions require eligibility for federal security screening and export‑control compliance. These requirements are considered Bona Fide Occupational Requirements (BFORs) under applicable human‑rights legislation.

To be eligible for employment at CSMC, candidates must be able to meet ALL of the following criteria:

Current Legal Authorization to Work in Canada

• Currently legally authorized to work in Canada
• Able to maintain valid work authorization for the duration of employment

Government of Canada Security Screening

• Able to obtain and maintain Reliability Status or higher
• Able to provide at least 5 years of continuous, verifiable background history
• Willing to undergo identity, employment, education, and criminal background checks

Foreign Influence & Foreign Affiliation Risk Assessment (FIRA)

CSMC works with controlled nuclear and defence technologies, and candidates must be eligible to undergo a Foreign Influence and Foreign Affiliation Risk Assessment, which may include review of:

• Foreign citizenship(s)
• Recent foreign residence
• Immediate family ties abroad
• Foreign financial, business, or government affiliations

Controlled Goods & Export‑Control Eligibility

• Eligible to access Controlled Goods under the Controlled Goods Program (CGP)
• Eligible to access export‑controlled technical data under Canadian law
• Willing to undergo additional screening if required

On‑Site Requirement

• Able to work on‑site as required for access to secure and controlled workspaces.

These requirements are regulatory in nature and are necessary to ensure compliance with federal law and the secure handling of sensitive technologies