X-energy

13 ago 2026

Mechanical Engineer, Graphite

Estados Unidos

Rockville, Maryland, United States

Job Description

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, 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 x-energy.com/contact-us.

X-energy is seeking professionals to join our Mechanical Engineering team in the role of Mechanical Design Engineer to support the development of the Xe-100. This role is responsible for the engineering design and development of mechanical systems, structures, and components such as Reactor Internal Structures, Steam Generator System, Helium Circulator System, Graphite Core Components, Reactor Cavity Cooling System, or Nuclear Auxiliary Systems. This includes concept development, evaluation of concepts, analysis of systems, structures, and components for their ability to perform their intended function, and ensuring they meet all technical specifications and requirements. The role will ensure the development of the systems and components through production including any necessary prototyping, testing, and commissioning.

Responsibilities

Develop mechanical/physical concepts, design and support development of processes to create or identify structures, systems, and components (SSCs) for use in nuclear products or facilities with a focus on nuclear safety.

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 project leads and systems engineers.

Planning and performing the analysis required to assess aspects of the SSCs to ensure they can perform their intended functions and meet technical specifications and design requirements.

Perform computations utilizing hand calculations and analytical tools for structural, thermal, hydraulic, and other scoping calculations as required at the direction of project leads and systems engineers to ensure SSCs can meet technical requirements.

Develop innovative mechanical solutions to refine and deploy concepts, technologies, and designs associated with X-energy developed reactors, including pressure vessels and piping, reactor internals, nuclear fuel, and high temperature materials such as graphite.

Integrate design activities across engineering team members, partners, and suppliers and perform supporting scoping and sizing calculations to downselect design features to meet design requirements using guidance from consensus codes and standards.

Create and maintain CAD-generated engineering models of reactor SSCs.

Support the assessment of SSCs for manufacturability as well as assembly and integration considerations at the direction of project leads.

Write and develop design documentation including design basis documents, technical reports, calculations, and drawings in accordance with applicable procedures.

Develop Verification and Validation (V&V) plans for analytical tools and support qualification of toolset.

Perform work in accordance with X-energy quality procedures for design and configuration management to ensure project quality requirements are met.

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.

Qualifications

Bachelor’s degree in mechanical engineering, or related engineering discipline (e.g., nuclear aerospace, chemical, etc.) from an accredited institution required.

Proficiency with engineering hand calculations is required.

Experience 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.

Experience in use of Computer-Aided Design (CAD) and product lifecycle management (PLM) software (e.g UG/NX, Solidworks, Pro-Engineer, Teamcenter, Windchill, or similar).

Job Profile Preferred Qualifications

Graphite design, modeling or analysis experience

Professional experience in commercial nuclear power as well as design, qualification, licensing, and construction to ASME Boiler & Pressure Vessel Code (BPVC) Section III, Division V

Job Level Qualifications

Level II

Level Tasks/Responsibilities

Support team members with the execution of the core tasks and responsibilities listed in the Job Profile Task/Responsibilities section of this document, under guided supervision.

Coordinate with engineering team members, partners, and suppliers to facilitate the convergence of efforts, allow design closure, provide design assurance, and deliver high quality engineering work products.

Level Minimum Qualifications

Typically, three years of experience in an engineering role required.

A master’s degree in engineering or related field (may include a combination of experience obtained through an academic institution, e.g., design projects, research, or design teams, as well as professional experience) may be in lieu of two years of experience.

A Ph.D. in engineering or related field (may include a combination of experience obtained through an academic institution, e.g., design projects, research, or design teams, as well as professional experience) may be in lieu of three years of experience.

Level III

Level Tasks/Responsibilities

Execute the core tasks and responsibilities listed in the Job Profile Task/Responsibilities section of this document, with minimal supervision.

Provide ownership, responsibility, and accountability over technical scope involving the coordination of multiple individual contributors working in a specific area.

Level Minimum Qualifications

Typically, five years of experience in an engineering role required.

A master’s degree in engineering or related field (may include a combination of experience obtained through an academic institution, e.g., design projects, research, or design teams, as well as professional experience) may be in lieu of two years of experience.

A Ph.D. in engineering or related field (may include a combination of experience obtained through an academic institution, e.g., design projects, research, or design teams, as well as professional experience) may be in lieu of three years of experience.

Level IV

Level Tasks/Responsibilities

Lead the execution of the core tasks and responsibilities listed in the Job Profile Task/Responsibilities section of this document, without close supervision and some latitude for independent judgement.

Provide feedback and guidance to more junior team members with the execution of the core tasks and responsibilities listed in the Job Profile Task/Responsibilities section of this document.

Lead small groups of engineers to solve complex technical problems and deliver high quality engineering work products on time and within budget.

Level Minimum Qualifications

Typically, ten years of experience in an engineering role required.

A master’s degree in engineering or related field (may include a combination of experience obtained through an academic institution, e.g., design projects, research, or design teams, as well as professional experience) may be in lieu of two years of experience.

A Ph.D. in engineering or related field (may include a combination of experience obtained through an academic institution, e.g., design projects, research, or design teams, as well as professional experience) may be in lieu of three years of experience.

Level V

Level Tasks/Responsibilities

Lead the execution of the core tasks and responsibilities listed in the Job Profile Task/Responsibilities section of this document, without close supervision and extensive latitude for independent judgement.

Teach and mentor more junior team members.

Stay abreast of industry and academic trends, breakthroughs, and best practices.

Level Minimum Qualifications

Typically, fifteen years of experience in an engineering role required.

A master’s degree in engineering or related field (may include a combination of experience obtained through an academic institution, e.g., design projects, research, or design teams, as well as professional experience) may be in lieu of two years of experience.

A Ph.D. in engineering or related field (may include a combination of experience obtained through an academic institution, e.g., design projects, research, or design teams, as well as professional experience) may be in lieu of three years of experience

.Previous experience at X-energy exceeding performance standards may be in lieu of years of experience.

Location: 9801 Washingtonian Boulevard, Gaithersburg, Maryland

Work Site Expectations: 4 days in office

Travel Expectations: up to 10% as needed

Hours: Standard office schedule are 8:00am-5:00pm ET, Mon-Fri

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.

Offers within the posted salary range are commensurate with the individual’s qualifications for the position, along with a view on internal equity, market

data, and room for growth. The salary range for this position is

Salary Range for Job Posting level II: $95,000 - $120,000 level III: $115,000 -

$140,000 Level IV: $140,000 - $170,000

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.gov/sites/default/files/everify/posters/IER_RightToWorkPoster%20Eng_Es.pdf

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

e-verify.gov/sites/default/files/everify/posters/EVerifyParticipationPoster.pdf

Idiomas

Mechanical Engineer, Graphite

Job Description

Responsibilities

Qualifications

Job Level Qualifications

Compensation

data, and room for growth. The salary range for this position is

Benefits

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