815,977open jobs
52,521companies
131,724added this week
Browse all
Salary
$163k – $208k per year
Location
In office (Rockville)
Seniority
Junior · 2+ years exp
Employment
Part-Time

Confirmed on the employer's own hiring board on Sep 26, 2026. First seen by Alion on Sep 24, 2026.

Overview
Company
Impact
Profile match
X-energy is an advanced nuclear reactor and fuel company headquartered in Rockville, Maryland, developing the Xe-100 high-temperature gas-cooled small modular reactor and the TRISO-X fuel that powers it. Founded in 2009, it has further offices and sites in Frederick, Maryland and Oak Ridge, Tennessee, where its fuel fabrication facility is being built, and works with utility and industrial partners on first deployments of its reactors in the United States. It recruits mechanical, electrical, fuel and thermal hydraulics engineers, project controls and supply chain specialists, procurement and purchasing staff, construction field engineers and corporate functions such as HR and recruiting.

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 position is responsible for managing the group of engineers responsible for performing a subdiscipline of mechanical engineering across all projects and programs. This includes directing the work of individual contributors on the team, at the discretion of projects which they are supporting, providing organizational support for the project team, and assisting with the design, analysis and drafting of systems, structures, and components for various advanced reactor plants.

Job Responsibilities

  • Manages the execution of the mechanical design, analysis, and evaluation of assigned projects using sound engineering principles and adhering to business standards, practices, procedures, and product / program requirements.
  • This role may include specialization in one or more of the following areas:
  • Lead team responsible for performing the mechanical design of various advanced reactor plants to inform the design, manufacturing, construction and licensing strategy.
  • Manages the utilization of engineering resources across multiple projects and ensures qualified engineers are performing assigned work.
  • Adjudicates technical differences within their area of responsibility to determine best option, while fostering a healthy engineering dialogue.
  • Lead design cycle sprints and provide direction to ensure the convergence of efforts of engineering team members, partners, and suppliers to ensure the successful delivery of high-quality engineering work products are on schedule and within budget as defined by the Project leadership.
  • Manages staff by ensuring they are meeting expectations and promoting their professional development.
  • Influences the development of strategy, methodology and technical tools for the area of responsibility, including control of resources, policy formulation, and ways in which technical work is executed.
  • Interprets simple internal and external business challenges and recommends best practices to improve products, processes, tools, or services.
  • Uses high level of judgement to make decisions and handle complex tasks or problems in areas of operations, product management, manufacturing, technology, or engineering.
  • Act in advisory capacity to define scope and level of effort estimates for areas where their resources would be supporting.
  • Work within a multidisciplinary engineering team to create the next generation nuclear power plants.
  • Perform work in accordance with design control procedures, ensuring thorough documentation of work, facilitation of internal and external design reviews, and control of product design configuration data.
  • Maintain professional demeanor and behavior at all times in all forms of communication.
  • Perform other duties as assigned by manager.

Minimum Qualifications

  • Bachelor’s degree in mechanical engineering or related discipline from an accredited university or college.
  • Typically, ten years of engineering experience. Graduate degrees typically count as two plus years of experience.
  • Experience and/or knowledge in a minimum of one of the following areas:
  • Designing and developing mechanical or fluid systems, assemblies, or components.
  • Hardware ownership including manufacturing and testing oversight.
  • Use of Computer-Aided Design (CAD) and product lifecycle management (PLM) software.
  • E.g. UG/NX, SolidWorks, Pro-Engineer, Teamcenter, Windchill, or similar.

Preferred Skills

  • Experience designing moving equipment/pressurized gas systems
  • Experience overseeing engineering lifecycle from the design to the fabrication of a product

Location: 9801 Washingtonian Blvd, Gaithersburg, MD

Work Site Expectations: 5 days in office

Travel Expectations: Up to 10%

Hours: Standard office hours are 8:00am - 5:00pm 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.

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:

$162,500 - $207,500

Position Job Classification

Part 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/ProfessionalDevelopment 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

Free account
Stop reading job ads. Get the ones that fit.
One free account turns this page into a shortlist built around your stack, your level and your pay.
Match on every job. Stack, seniority, pay and location, scored against your profile.
815,977 open roles. Read straight off company career pages, refreshed every day.
Unlimited applications. Every one you send is tracked in one place, on-site or on a company board.
3 tailored CVs a month. Rewritten for the exact job you are applying to. Included free.
Create a free account Continue with Google
Free forever. No card. Under a minute.

Your match

How well do you fit this role?
Two answers are enough for a real match. No account needed.
Check my fit
Answers stay in this browser until you create an account.

Recommended for you based on this role

Industrial Engineering
Similar stack
Same company
Rockville
Anti-Cheat Engineer 1 hour ago
≈ $73k – $140k per year (Estimated) • Hybrid • 4+ years exp • Austin
C++
C++
LLVM
DevOps
Linux
Windows
Apply
≈ $64k – $121k per year (Estimated) • In office • 1+ year exp • Bachelor's Degree • Austin
DevOps
Platform Engineering
Cybersecurity
SIEM
Apply
$50k – $56k per year • In office • Full-Time • 2+ years exp • Washington
Apply
≈ $61k – $119k per year (Estimated) • Hybrid • Full-Time • 3+ years exp • High School Diploma • Tampa
Management
Outlook
Microsoft Office
Apply
$44k – $48k per year • Remote (United States) • Full-Time • 1+ year exp • United States
Apply
$126k – $227k per year • Equity • In office • Full-Time • 8+ years exp • Bachelor's Degree • Austin
MATLAB
MATLAB
Simulink
Robotics
Digital Twin
Design
SolidWorks
IoT
OPC UA
Apply
$132k – $238k per year • Equity • In office • Full-Time • 8+ years exp • Bachelor's Degree • Austin
Mobile
Modularization
Design
SolidWorks
Apply
≈ $69k – $170k per year (Estimated) • In office • Full-Time • Bachelor's Degree • Wilmington
Design
SolidWorks
Apply
In office • 3+ years exp • Bachelor's Degree
Design
SolidWorks
AutoCAD
Apply
In office • PhD
AI/ML
Machine Learning
Design
SolidWorks
Apply
$123k – $139k per year • In office • Full-Time • 5+ years exp • Bachelor's Degree • Rockville
Design
SolidWorks
Apply
$123k – $139k per year • In office • Full-Time • 10+ years exp • Bachelor's Degree • Rockville
Apply
$75k – $103k per year • In office • Full-Time • 10+ years exp • Bachelor's Degree • Lafayette
Apply
$100k – $125k per year • Hybrid • Full-Time • 10+ years exp • Bachelor's Degree • Rockville
Apply
Materials Engineer 9 days ago
$80k – $104k per year • In office • Full-Time • 5+ years exp • Bachelor's Degree • Rockville
Apply
$163k – $220k per year • Equity • In office • Full-Time • 7+ years exp • Bachelor's Degree • Rockville
AI/ML
Stable Diffusion
ControlNet
Apply
$123k – $139k per year • In office • Full-Time • 5+ years exp • Bachelor's Degree • Rockville
Design
SolidWorks
Apply
$123k – $139k per year • In office • Full-Time • 10+ years exp • Bachelor's Degree • Rockville
Apply
≈ $58k – $143k per year (Estimated) • In office • Rockville
Apply
Hybrid • 3+ years exp • Rockville
JavaScript
Apex
DevOps
CI/CD
Bitbucket
Management
Confluence
Jira
Agile
Scrum
Apply
See all jobs
This is one of many
815,977 more open roles from verified company boards, updated every day.