Mechanical Design Engineering Intern

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

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]