1,128,939open jobs
65,067companies
198,483added this week
Browse all
Salary
$163k – $208k per year
Location
In office (Rockville)
Seniority
Junior · 2+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 3, 2026. First seen by Alion on Oct 2, 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.
Backed by G Squared

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

X-energy LLC is hiring a Plant & Process System Manager. This position is responsible for providing leadership and management/technical oversight to the team of engineers designing and developing plant layout, piping arrangements, and system processes. This role manages a team of engineers of various disciplines that direct the technical requirements and configuration of the layout, piping arrangements, and system processes of the plant through all project life cycle phases.

Job Profile Tasks/Responsibilities

  • Manages the execution of the designing and developing plant mechanical systems using sound engineering principles and adhering to business standards, practices, procedures, and product / program requirements.
  • Manages the identification and mitigation of design conflicts using 3D software.
  • Manages the utilization of engineering resources across multiple projects and ensures qualified engineers are performing assigned work.
  • Oversee project design cycle sprints 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 as defined by the Project leadership.
  • Manages engineering staff by ensuring staff are meeting expectations and promoting staff professional development.
  • Supports the Business Development workgroup providing technical resources when needed and engaging with potential future clients to promote marketing of the X-energy products and/or technologies.
  • Influences the development of strategy, methodology and technical tools for the area of responsibility, including control of resources and policy formulation.
  • Interprets 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, project management, technology, or engineering.
  • Assesses quality of information given and asks pertinent questions to stakeholders.
  • Offers new solutions to problems outside of set parameters and can construct and provide recommendations.
  • Work within a multidisciplinary engineering team to create the next generation nuclear power plants.
  • Ensure work is performed in accordance with design control procedures, ensuring thorough documentation of work, 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 direct manager.

Minimum Qualifications

  • Bachelor’s degree in mechanical or systems 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.
  • Requires specialized knowledge within the function of mechanical engineering or systems engineering, related to system requirements, system physical architecture, integrated system design, technical data management, and technical risk management.

Preferred Qualifications

  • Experience in managing the development of integrated power plant mechanical systems.
  • Experience working on large EPC or EP projects.
  • Experience working in the nuclear industry.
  • Experience leading and mentoring design engineers.
  • Knowledge of ASME piping and pressure vessel codes (e.g., B31.1 and ASME BPVC).

Location: 9801 Washingtonian Blvd, Gaithersburg, MD

Work Schedule: 4 days a week in office

Travel Expectations: Up to 10% as needed

Hours: 8:00am-5:00pm, 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

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/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.
1,128,939 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.

Recommended for you based on this role

HR
Similar stack
Same company
Rockville
≈ $47k – $96k per year (Estimated) • In office • Part-Time • 1+ year exp • High School Diploma • Atlanta
Apply
Title Processor II 3 days ago
$34k per year • In office • Full-Time • 2+ years exp • High School Diploma • Baltimore
Apply
$34k per year • In office • Full-Time • 2+ years exp • High School Diploma • Baltimore
Analytics
Microsoft Excel
Apply
$64k – $80k per year • In office • Full-Time • 3+ years exp • United States
Apply
$50k – $60k per year • Remote (United States) • Full-Time • 2+ years exp • High School Diploma • Cincinnati
Management
Outlook
Microsoft Office
Apply
$86k – $104k per year • In office • Full-Time • 10+ years exp • Associate's Degree • Frederick
Apply
$139k – $159k per year • In office • Full-Time • 10+ years exp • High School Diploma • Rockville
Python
Java
Databases
PostgreSQL
Frontend
GraphQL
DevOps
Rest API
Terraform
GitLab CI
CI/CD
AWS
Kubernetes
Amazon EKS
AWS Lambda
GitLab
API Gateway
SOAP
Management
SharePoint
Agile
Apply
$163k – $185k per year • Hybrid • Full-Time • 15+ years exp • Bachelor's Degree • Rockville
AI/ML
Supervision
Management
Microsoft Office
Apply
$198k – $248k per year • In office • Full-Time • 10+ years exp • Bachelor's Degree • Oak Ridge
Apply
Manager, Recruiting 8 days ago
$135k – $160k per year • In office • Full-Time • 10+ years exp • Bachelor's Degree • Oak Ridge
Management
Outlook
Microsoft Office
Marketing
LinkedIn
Apply
$88k – $108k per year • In office • Full-Time • 3+ years exp • Rockville
Apply
$38k per year • Equity • In office • Part-Time • High School Diploma • Rockville
Apply
$139k – $159k per year • In office • Full-Time • 10+ years exp • High School Diploma • Rockville
Python
Java
Databases
PostgreSQL
Frontend
GraphQL
DevOps
Rest API
Terraform
GitLab CI
CI/CD
AWS
Kubernetes
Amazon EKS
AWS Lambda
GitLab
API Gateway
SOAP
Management
SharePoint
Agile
Apply
$125k – $135k per year • In office • Full-Time • 7+ years exp • Bachelor's Degree • Rockville
Apply
$200k per year • In office • Full-Time • 2+ years exp • Rockville
Apply
See all jobs
This is one of many
1,128,939 more open roles from verified company boards, updated every day.