Mechanical Design Engineering Intern

This is a Full-time 16-month role commencing May 2026

For this role in Oakville, Ontario, The hourly wage range for this position is CAD $25 to $35 per hour. The actual wage offered will be determined based on factors such as education, experience, knowledge, skills, abilities, applicable market data for the work location, and internal equity considerations.

Come join us at Terrestrial Energy, a US developer of advanced, Generation IV nuclear reactors.  We are growing our workforce to develop and deploy our Integral Molten Salt Reactor (IMSR) small modular nuclear plant to provide cost-competitive, clean firm heat and power to industry.

The Company has recently completed a merger creating a publicly listed operating company  (NASDAQ “IMSR”), to secure the capital resources for our next growth phase.  With the current alignment of US Federal and State government, as well as industry interest in Small Modular Reactor (SMR) and advanced reactor technologies such as Terrestrial Energy’s IMSR, there is today a unique and compelling opportunity to participate in the execution of the company’s growth business plan.

The Company is building a team of high-performing business professionals and leaders in engineering, R&D, product management and business development areas at our Charlotte, North Carolina headquarters and future project sites.  We are looking for talented individuals who can help build the organization, processes, and goal-orientated corporate culture to lead the company in our expansion.  We are seeking people who:

Have US market experience and perspectives bringing good judgement and innovative approaches to problem solving and business plan execution.

Have demonstrated exceptional performance in past engineering projects.

Offer exceptional leadership and team building capabilities.

Have a deep understanding of the requirements for advanced reactor development.

Can assist in the creation of the discipline and organized company structure, and contributed to a culture of excellence, necessary for the development and deployment of the Company’s IMSR plant.

Can thrive in a fast growing and opportunity business environment, and are capable of flexibility and adaptability at a time of organizational change.

Have the specific skillset and experience for the following role:

The Mechanical Design Engineering Intern, under the direction of the Mechanical Engineering Manager, is primarily responsible for aiding the Mechanical Design team in the design, development and analysis of mechanical systems.

Other Responsibilities Include:

Prepare & edit calculations, analysis and assessment documents for the development of system and equipment design

Conduct research for design development and optimization

Facilitate communication and work with various technical disciplines to understand system design(s) and interfacing requirements

Coordinate and interface with the plant layout lead in the development of 3D CAD for the responsible mechanical systems

Assist in the development of design specifications to align with project requirements and industry standards

Contribute to timely resolution of mechanical design challenges and address risks

Participate in design review meetings to provide input, feedback, and support for design validation and improvement

Coordinate and support work with other disciplines

Conduct presentations to interdisciplinary team and external parties

Interface with external vendors, experts and design agencies

Exposure to nuclear, thermal, mechanical analysis and design of systems and components in relation to the reactor system

Exposure to reactor engineering design and analysis in neutronics, thermal-hydraulics, and/or radiation for steady state and transient conditions, including transport and Monte Carlo methods

Core Competencies:

Attention to Detail

Technical Aptitude, Engineering Principles

Innovation & Creativity

Communication

Critical Thinking

Decision Making 

Self-Leadership, Initiative

Planning and Organizing

Problem Solving, Analytical Skills

Results Orientation

Team player with the ability to collaborate and interact with other groups

Flexible and adaptable to change

Learning Orientation

Requirements:

Education

Currently enrolled in a Bachelor’s or Master’s degree program in Mechanical Engineering or a closely related engineering discipline.

Experience

Academic, co-op, or project experience involving mechanical design, analysis, prototyping, testing, or technical documentation

Exposure to industry tools, lab equipment, or engineering workflows through coursework, student projects, or internships

Technical Skills

Strong analytical and problem-solving skills

Fundamental understanding of mechanical engineering principles (e.g., statics, dynamics, thermodynamics, heat transfer, materials, fluid mechanics)

Proficiency with Microsoft Office tools (Excel, Word, PowerPoint)

Ability to read and interpret engineering drawings, schematics, and technical documentation

Professional Skills

Clear technical writing and documentation skills

Ability to manage multiple tasks and meet deadlines

Willingness to learn and take initiative

Effective communication skills within a technical team environment

Flexibility to adjust to shifting priorities and deadlines

Assets:

Demonstrated success in project delivery and the execution of design methods

Demonstrated passion for nuclear and/or reducing carbon emissions

Entrepreneurship or other experience demonstrating self-motivation and problem solving

Experience with or knowledge of nuclear power

Experience with CAD software (e.g., SolidWorks, Inventor, NX, or similar) is an asset
Familiarity with data analysis tools or simulation/FEA tools (e.g., MATLAB, ANSYS) is considered an asset

 Benefits:

Mentoring/Coaching with Senior Employees/Leaders

Collaborative and supportive work environment

Opportunities to network across departments

Hands-on experience with real projects

Please submit a Resume, Cover Letter, and Transcripts (Unofficial copies are acceptable at this stage.)

Candidates must be legally authorized to work in the US without the need for sponsorship for employment visa status.

Terrestrial Energy requires that the successful candidate be able to access and use information subject to U.S. Export Control Laws, which mandate all citizenships (including dual citizenships) be from the U.S. Department of Energy’s List of Generally Authorized Countries (10 CFR Part 810 Appendix A and can be found here:
eCFR :: Appendix A to Part 810, Title 10 -- Generally Authorized Destinations

unless a specific authorization from the U.S. Department of Energy is obtained or unless you are a U.S. citizen, U.S. national, U.S. permanent resident, or protected individual under the U.S. Immigration and Naturalization Act (8 U.S.C. 1324b(a)(3)).

Additional information can be found here: 

https://www.energy.gov/nnsa/10-cfr-part-810.

Terrestrial Energy Inc. is an equal opportunity employer and does not discriminate on the basis of any legally protected status or group.  We encourage applications from all qualified individuals. 

If you require accommodation during the application or interview process, please advise us as soon as possible so appropriate arrangements can be made. If you require technical support in a format that is accessible to you, please contact [email protected]