X-energy · 1 day ago
Mechanical Design Engineer
Rockville, MD
Full-time
Onsite
Entry, Mid, Senior Level, Lead/Staff
$80K/yr - $198K/yr
1+ years expX-energy is seeking professionals to join their Mechanical Engineering team as a Mechanical Design Engineer to support the development of the Xe-100. This role is responsible for the engineering design and development of mechanical systems and components, ensuring they meet technical specifications and requirements.
Clean EnergyCleanTechEnergyNuclearRenewable Energy
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
Qualification
Required
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)
Preferred
Experience with commercial nuclear power plant operations
Professional experience in commercial nuclear power as well as design, qualification, licensing, and construction to ASME Boiler & Pressure Vessel Code (BPVC) Section III and/or Section VIII
Experience with NRC regulations and licensing requirements for safety-related systems
Experience with design using ASME BPV Code, ASME B31.1 or B31.3, and other industry standards
Experience with Mechanical Process Equipment (Piping, Ducting, HVAC, Fire Suppression, Pumps, Pressure Vessels, Piping, Valves, Structural Supports) selection, sizing, and specification development
Hands-on experience with graphite or other non-metallic components, fabrication or assembly sequencing, and/or tooling development preferred. Experience with procurement and manufacturing oversight of pressure vessel or large metallic components
Benefits
401K plan with an employer match
Medical/Dental /Vision Insurance
Life and Disability Insurance
Paid Time Off
Tuition Reimbursement/Professional Development policy that supports the continuing education of our employees
Company
X-energy
X-energy is a nuclear energy company that develops small modular nuclear reactors and nuclear fuels for clean energy generation.
501-1000 employees
H1B Sponsorship
X-energy has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)
2024 (1)
2022 (2)
2020 (1)
Funding
Current Stage
Late StageTotal Funding
$1.71BKey Investors
Jane Street CapitalPittco ManagementDepartment for Energy Security & Net Zero
2025-11-24Series D· $700M
2025-03-05Private Equity· $22.8M
2024-10-16Series C· $700M
Leadership Team
J. Clay Sell
CEO
Robert Taylor
Vice President, Regulatory Affairs and Licensing
Recent News
2026-01-06
Crunchbase News
2025-12-17
Company data provided by crunchbase