X-energy LLC conducts a thorough recruiting process and will never issue offers without interview to discuss qualifications and responsibilities. All applications will be submitted via our company career page, www.x-energy.com/careers/. We will never ask you to provide payment information as part of the recruiting process. If anyone claiming to represent X-energy directs you in a manner otherwise, please contact us at www.x-energy.com/contact-us.

Job Description

Please note: This is a pipeline requisition for anticipated Summer 2027 internship openings. We accept and review applications on a rolling basis, and we extend offers as individual positions are finalized and specific team hiring needs are confirmed. Submitting an application places you in consideration for upcoming opportunities as they open.

What You'll Do

• Support active engineering projects and analyses within your area of study, contributing to work that advances real reactor design and licensing efforts.
• Assist with the day-to-day technical and operational needs of your team.
• Conduct research, gather technical data, and synthesize findings to inform ongoing design and analysis initiatives.
• Help develop reports, technical documentation, and presentations that communicate results to internal stakeholders.
• Organize and maintain project files, technical records, and documentation to support traceability and quality.
• Participate actively in team meetings, design reviews, and brainstorming sessions — bringing ideas, asking questions, and offering perspective.

What You'll Bring

• Current enrollment in — or recent completion of — a degree in mechanical engineering or a closely related field from an accredited institution.
• Academic or hands-on knowledge in a minimum of one of the following areas:

  • Mechanical Design

    • Designing and developing mechanical or fluid systems, assemblies, or components.

    • One plus years of demonstrated hands-on experience developing and delivering hardware or manufacturing processes in a production environment is required. May include industry internship experience, hobby, or participation in collegiate engineering projects such as: Formula SAE, Baja SAE, Design Build Fly, Rocket Club, etc.

    • Hardware ownership including manufacturing and testing oversight.

    • Use of Computer-Aided Design (CAD) and product lifecycle management (PLM) software.

  • Thermodynamics

    • Use of 1D flow-solvers performing heat/energy and mass balance (e.g., RELAP, Flownex, NPSS, SINDA/FLUINT, Flomaster, or similar).

  • E.g. UG/NX, SolidWorks, Pro-Engineer, Teamcenter, Windchill, or similar.

    • Structural Analysis

      • Analytical experience with structural analysis hand calculations and structural FEA software programs (e.g., ANSYS, ABAQUS, NASTRAN, FEMAP, CAESAR, ROHR, LS-DYNA, PIPESTRESS).

    • Thermal Hydraulics

      • Use of Computational Fluid Dynamics (CFD) analysis codes (e.g., STAR-CCM+, Fluent, or similar).

    • Mechanical Process Equipment

      • Piping, Ducting, HVAC, Fire Suppression, Pumps, Valves

• Proficiency with the Microsoft Office Suite (Outlook, Word, Excel, PowerPoint).
• Curiosity, initiative, and a collaborative mindset — you're eager to learn and ready to contribute.

Application Requirements

Along with your resume, please submit at least one letter of recommendation. Letters should come from a professor, academic advisor, employer, or professional mentor who can speak directly to your qualifications, work ethic, and potential.

Program Details

Location: 9801 Washingtonian Blvd, Gaithersburg, MD

Work Site Expectations: Fully on-site, 5 days per week

Program Length: 10-week program (anticipated June–August 2027; exact dates to be confirmed)

Hours: Standard office hours, 8:00 AM–5:00 PM ET, Monday–Friday

Compensation

As required by Maryland and other applicable state law, X Energy, LLC (X-energy) lists the expected compensation range for a publicly advertised job opportunity based upon the job requirements (e.g. education/training, experience, skill sets, etc.).  Individual candidates who meet the job requirements for the posted position will be offered a salary within this range based on their respective levels of education/training, experience, and other qualifications unique to them.  Salary ranges may vary based on the specific office location and region referenced in the posting to take into consideration differences in cost of living and may not be reflective of all regions.  Please note that compensation ranges listed for US job postings reflect base salary only and do not include benefits or other incentives. 

A reasonable estimate for this position at the level of experience required is:

Position Job Classification