Mechanical Design Engineer I

Posted:
3/24/2026, 11:28:22 PM

Location(s):
Maryland, United States ⋅ Rockville, Maryland, United States

Experience Level(s):
Junior ⋅ Mid Level

Field(s):
Mechanical Engineering

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

This role is responsible for the design and development of mechanical systems and components. This includes concept development, evaluation of concepts, analysis of systems and components for their ability to perform their intended function, and ensuring they meet all technical specifications and requirements. They will ensure the development of the systems and components through production including any necessary prototyping, testing, and commissioning.


 

Job Profile Tasks/Responsibilities

  • Develop mechanical/physical concepts, design and support development of processes to create structures systems and components (SSCs). Understand how nuclear safety relates to system engineering and the work performed on a day-to-day occurrence.
  • Identify, collect, and document applicable requirements, interfaces, design basis and criteria by coordinating with key stakeholders/systems engineers and support identifying applicable industry codes and standards and the direction of senior engineers and systems engineers.
  • Create and maintain CAD-generated engineering models.
  • Planning for the analysis required to assess aspects of the SSCs to ensure they can perform their intended functions and meet technical specifications and requirements.
  • Perform computations utilizing hand calculations and analytical tools for structural, thermal, hydraulic, and other scoping calculations as required at the direction of senior engineers and systems engineers to ensure SSCs can meet technical requirements.
  • Support the assessment of SSCs for manufacturability as well as assembly and integration considerations at the direction of senior engineers.
  • Perform work in accordance with X-energy quality procedures for design and configuration management to ensure project quality requirements are met.
  • Write and develop design documentation including design basis documents, technical reports, calculations, and drawings in accordance with applicable procedures.
  • Provide independent reviews and acceptance reviews of engineering deliverables and data.
  • Maintain professional demeanor and behavior at all times in all forms of communication.
  • Perform other duties as assigned by manager.

Job Profile Minimum Qualifications

  • Bachelor’s degree in engineering or related degree from an accredited institution.
  • Zero to two years of experience in an engineering role.

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:

$70,050- $116,750

Position Job Classification

Full time - Exempt

Benefits 

X Energy, LLC offers a robust benefits package that includes a 401K plan with an employer match, Medical/Dental /Vision Insurance, Life and Disability Insurance, Paid Time Off, and a Tuition Reimbursement/Professional Development policy that supports the continuing education of our employees. 

An Equal Opportunity Employer.  All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.   

X Energy, LLC participates in E-Verify. Please visit the links below for more information about E-Verify and the protection of your Right to Work. 

Right To Work Link:  If you have the right to work, don't let anyone take it away (e-verify.gov)

E-Verify Participation Link:  E-Verify Participation Poster English and Spanish  

X-energy

Website: https://x-energy.com/

Headquarter Location: Rockville, Maryland, United States

Employee Count: 501-1000

Year Founded: 2009

IPO Status: Private

Last Funding Type: Private Equity

Industries: Clean Energy ⋅ CleanTech ⋅ Energy ⋅ Nuclear ⋅ Renewable Energy