About the Company

General Matter is enriching uranium in America. 

Our goal is to design, build, and operate the world’s lowest-cost enrichment services in the United States.  

Our mission is to restore America’s ability to produce nuclear fuel—fuel that will power AI, advanced manufacturing, critical industries, and the next generation of nuclear reactors. 

Ultimately, our work will help power national ambitions and enable a high-energy society. 

We were incubated by Founders Fund, like Anduril and Palantir before us, and are backed by top-tier investors. Our lean, world-class team of engineers and operators is applying a first-principles approach to solving the problem of nuclear fuel production.  

We are a mission-driven company with a culture of urgency, accountability, and transparency. 

Help us build a high-energy society by making the cleanest, safest form of baseload energy the most affordable. 

About This Role

As a General Matter Mechanical Engineer, you will design, build, test, and own the mechanisms and mechanical structures enabling enrichment technology. You will work closely with cross-functional teams, including electrical engineers, software engineers, chemical engineers, manufacturing engineers, nuclear engineers, materials scientists and physicists. If you seek high-impact and are excited by fast-paced, intense, Skunkworks-style projects, we encourage you to reach out to join our team.

Responsibilities

• Develop mechanisms and mechanical structures for enrichment and own them through the entire product lifecycle including requirements definition, design, development, qualification, and release to production.
• Support optimization of designs for cost, performance, and manufacturability.
• Functionally test your hardware through thermal, vibe, shock, durability, etc.
• Perform root-cause analysis on test failures and develop hardware mitigations.
• Participate in design review and provide feedback to ensure design objectives are met.
• Work closely with electrical, software, manufacturing, and nuclear engineers to ensure designs are effectively integrated with overall system requirements.

Basic Qualifications

• Evidence of exceptional ability (prior projects, portfolio of work, completed products, etc).
• Bachelor’s degree in Mechanical Engineering or a related field.
• 1+ years of mechanical engineering experience via project team, research, internship, and/or professional experience.
• Proficient in a 3D CAD package (such as Solidworks, CATIA, NX, etc.) and the ability to make manufacturing drawings using GD&T.
• Proficiency in finite element analysis (FEA).

Preferred Skills and Experience

• Strong understanding of engineering fundamentals.
• Ability to perform trade studies and make clear recommendations using first principles and engineering fundamentals even with partial information.
• Experience in a fast-paced engineering environment or a highly technical role requiring a resourceful, entrepreneurial approach to complete tasks within tight timeframes or budget constraints.

Additional Requirements

• Ability to work extended hours and weekends as necessary.

Equal Opportunity Employer

General Matter is an Equal Opportunity Employer; employment with General Matter is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

Compensation and Benefits

The base salary range for this role is $80,000-$95,000 annually. 

Compensation bands are determined by role, level, location, and alignment with market data. Individual level and base pay is determined on a case-by-case basis and may vary based on job-related skills, education, experience, technical capabilities and internal equity. Please note that the stated salary range is an estimate and may be adjusted based on market conditions, business needs, or other factors. In addition to base salary, for full-time hires, you may also be eligible for long-term incentives, in the form of stock options, and access to medical, vision & dental coverage as well as access to a 401(k) retirement plan.

About the Company

General Matter is enriching uranium in America. 

Our goal is to design, build, and operate the world’s lowest-cost enrichment services in the United States.  

Our mission is to restore America’s ability to produce nuclear fuel—fuel that will power AI, advanced manufacturing, critical industries, and the next generation of nuclear reactors. 

Ultimately, our work will help power national ambitions and enable a high-energy society. 

We were incubated by Founders Fund, like Anduril and Palantir before us, and are backed by top-tier investors. Our lean, world-class team of engineers and operators is applying a first-principles approach to solving the problem of nuclear fuel production.  

We are a mission-driven company with a culture of urgency, accountability, and transparency. 

Help us build a high-energy society by making the cleanest, safest form of baseload energy the most affordable. 

About This Role

As a General Matter Mechanical Engineer, you will design, build, test, and own the mechanisms and mechanical structures enabling enrichment technology. You will work closely with cross-functional teams, including electrical engineers, software engineers, chemical engineers, manufacturing engineers, nuclear engineers, materials scientists and physicists. 

Responsibilities

• Develop mechanisms and mechanical structures for enrichment and own them through the entire product lifecycle including requirements definition, design, development, qualification, and release to production.
• Support optimization of designs for cost, performance, and manufacturability.
• Functionally test your hardware through thermal, vibe, shock, durability, etc.
• Perform root-cause analysis on test failures and develop hardware mitigations.
• Participate in design review and provide feedback to ensure design objectives are met.
• Work closely with electrical, software, manufacturing, and nuclear engineers to ensure designs are effectively integrated with overall system requirements.

Basic Qualifications

• Evidence of exceptional ability (prior projects, portfolio of work, completed products, etc).
• Bachelor’s degree in Mechanical Engineering or a related field.
• 3+ years of mechanical engineering experience via project team, research, internship, and/or professional experience.
• Proficient in a 3D CAD package (such as Solidworks, CATIA, NX, etc.) and the ability to make manufacturing drawings using GD&T.
• Proficiency in finite element analysis (FEA).

Preferred Skills and Experience

• Strong understanding of engineering fundamentals.
• Ability to perform trade studies and make clear recommendations using first principles and engineering fundamentals even with partial information.
• Experience in a fast-paced engineering environment or a highly technical role requiring a resourceful, entrepreneurial approach to complete tasks within tight timeframes or budget constraints.

Additional Requirements

• Ability to work extended hours and weekends as necessary.

Equal Opportunity Employer

General Matter is an Equal Opportunity Employer; employment with General Matter is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

Compensation and Benefits

The base salary range for this role is $80,000-$170,000 annually. 

Compensation bands are determined by role, level, location, and alignment with market data. Individual level and base pay is determined on a case-by-case basis and may vary based on job-related skills, education, experience, technical capabilities and internal equity. Please note that the stated salary range is an estimate and may be adjusted based on market conditions, business needs, or other factors. In addition to base salary, for full-time hires, you may also be eligible for long-term incentives, in the form of stock options, and access to medical, vision & dental coverage as well as access to a 401(k) retirement plan.

About the Company

General Matter is enriching uranium in America. 

Our goal is to design, build, and operate the world’s lowest-cost enrichment services in the United States.  

Our mission is to restore America’s ability to produce nuclear fuel—fuel that will power AI, advanced manufacturing, critical industries, and the next generation of nuclear reactors. 

Ultimately, our work will help power national ambitions and enable a high-energy society. 

We were incubated by Founders Fund, like Anduril and Palantir before us, and are backed by top-tier investors. Our lean, world-class team of engineers and operators is applying a first-principles approach to solving the problem of nuclear fuel production.  

We are a mission-driven company with a culture of urgency, accountability, and transparency. 

Help us build a high-energy society by making the cleanest, safest form of baseload energy the most affordable. 

About This Role 
We are seeking a Mechanical Designer to develop and maintain the 3D CAD model for piping and mechanical systems in a complex nuclear enrichment facility. This role emphasizes detailed routing, spatial integration, and layout optimization, ensuring designs are accurate, constructible, and coordinated across disciplines. The ideal candidate has strong plant design software expertise and experience translating design intent into precise, model-centric layouts. 

Responsibilities 

• Own and maintain the 3D CAD model for piping and mechanical systems, ensuring alignment with process and mechanical specifications.
• Develop, update, and maintain piping component libraries, data attributes, tagging, and system standards to ensure consistency between P&IDs, 3D models, and documentation.
• Perform detailed routing of pipes, valves, specialty components, and supports, considering space constraints, accessibility, maintainability, and constructability.
• Coordinate with structural, HVAC, and electrical systems to avoid clashes and optimize layouts.
• Conduct clash detection and interdisciplinary model reviews using plant design tools.
• Produce isometric drawings, general arrangement drawings, spool sheets, and installation documentation for fabrication and construction.
• Define spool breaks and support modular construction where applicable.
• Collaborate with engineers to ensure design intent, constructability, and field installation requirements are incorporated.
• Maintain as-built documentation and update models throughout the project lifecycle. 

Basic Qualifications 

• Associate’s degree or equivalent experience in Mechanical Design, Drafting, or related field.
• 3+ years of hands-on experience modeling piping systems in 3D plant design platforms.
• Proficiency with plant design software (e.g., AutoCAD Plant 3D, AVEVA E3D, SmartPlant 3D, CADWorx, or similar).
• Strong understanding of piping systems, mechanical components, and industrial layout principles.
• Ability to interpret P&IDs and specifications into accurate 3D models.
• Experience producing piping isometrics, general arrangement drawings, and fabrication documentation. 

Preferred Skills 

• Experience in nuclear, chemical, petrochemical, or other complex industrial facilities.
• Familiarity with spec-driven piping, automated part selection, and component catalogs.
• Knowledge of piping line numbering, tagging systems, and engineering data attributes.
• Experience modeling pipe supports, equipment connections, and maintenance clearances in dense layouts.
• Familiarity with model coordination and clash detection tools (e.g., Navisworks).
• Understanding of fabrication and field installation practices, including spool breaks and field fit.
• Ability to thrive in fast-paced, multidisciplinary environments. 
  

Additional Requirements

• Ability to work extended hours and weekends as necessary.

Equal Opportunity Employer

General Matter is an Equal Opportunity Employer; employment with General Matter is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

Compensation and Benefits

The base salary range for this role is $80,000-$170,000 annually. 

Compensation bands are determined by role, level, location, and alignment with market data. Individual level and base pay is determined on a case-by-case basis and may vary based on job-related skills, education, experience, technical capabilities and internal equity. Please note that the stated salary range is an estimate and may be adjusted based on market conditions, business needs, or other factors. In addition to base salary, for full-time hires, you may also be eligible for long-term incentives, in the form of stock options, and access to medical, vision & dental coverage as well as access to a 401(k) retirement plan.

About the Company

General Matter is enriching uranium in America. 

Our goal is to design, build, and operate the world’s lowest-cost enrichment services in the United States.  

Our mission is to restore America’s ability to produce nuclear fuel—fuel that will power AI, advanced manufacturing, critical industries, and the next generation of nuclear reactors. 

Ultimately, our work will help power national ambitions and enable a high-energy society. 

We were incubated by Founders Fund, like Anduril and Palantir before us, and are backed by top-tier investors. Our lean, world-class team of engineers and operators is applying a first-principles approach to solving the problem of nuclear fuel production.  

We are a mission-driven company with a culture of urgency, accountability, and transparency. 

Help us build a high-energy society by making the cleanest, safest form of baseload energy the most affordable. 

Mechanical Design Engineer - Plant Piping Systems

General Matter is seeking a Mechanical Design Engineer to transform conceptual process designs into fully engineered systems for a large-scale nuclear enrichment facility. This role focuses on detailed mechanical design, including piping systems, component selection, and structural analysis, ensuring that complex process architectures are realized safely and reliably. The ideal candidate will combine expertise in mechanical engineering fundamentals with experience in high-hazard or industrial plant environments, delivering robust solutions for advanced nuclear energy production. 

Responsibilities

• Translate P&IDs and process architecture outputs into detailed mechanical designs for piping and equipment systems. 
• Perform component sizing and selection (pipes, valves, fittings, supports) based on process conditions (flow, temperature, pressure). 
• Collaborate on routing plans and layouts for piping systems, ensuring efficient and maintainable configurations. 
• Conduct structural and flow analysis to validate mechanical integrity and performance under operating conditions. 
• Specify materials, thicknesses, and support methods to meet safety, regulatory, and operational requirements. 
• Prepare detailed engineering drawings, BOMs, and procurement specifications for mechanical systems. 
• Select components that meet technical requirements while considering availability and lead times, ensuring designs can be executed on schedule without compromising quality or safety. 
• Collaborate with process engineers, structural engineers, and procurement teams to ensure seamless integration of designs. 
• Participate in design reviews and risk assessments, providing technical justification for design decisions. 
• Support installation planning and provide technical oversight during construction phases as needed. 

Basic Qualifications

• Bachelor’s degree in Mechanical Engineering or a related field. 
• 3+ years of experience in mechanical design for industrial plants, chemical facilities, or similar high-hazard environments. 
• Strong understanding of fluid mechanics, structural analysis, and material selection. 
• Proficiency in piping design standards (ASME, ANSI, or equivalent) and familiarity with pressure vessel codes. 
• Experience with CAD tools for mechanical design and layout. 
• Ability to interpret P&IDs and process documentation and translate them into detailed mechanical designs. 
• Excellent problem-solving and communication skills for cross-functional collaboration. 
• Evidence of exceptional ability (prior projects, portfolio of work, completed products, etc).

Preferred Skills and Experience

• Experience in nuclear, chemical, petrochemical, or gas processing facilities. 
• Familiarity with stress analysis tools and piping flexibility analysis (e.g., Caesar II or similar). 
• Knowledge of compressible flow, vacuum systems, and cryogenic piping design. 
• Procurement experience for large-scale facilities, including vendor engagement and managing long-lead components. 
• Ability to thrive in a fast-paced, multidisciplinary environment, balancing technical rigor with practical constraints. 

Additional Requirements

• Ability to work extended hours and weekends as necessary.

Equal Opportunity Employer

General Matter is an Equal Opportunity Employer; employment with General Matter is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

Compensation and Benefits

The base salary range for this role is $90,000–$175,000 annually. 

Compensation bands are determined by role, level, location, and alignment with market data. Individual level and base pay is determined on a case-by-case basis and may vary based on job-related skills, education, experience, technical capabilities and internal equity. Please note that the stated salary range is an estimate and may be adjusted based on market conditions, business needs, or other factors. In addition to base salary, for full-time hires, you may also be eligible for long-term incentives, in the form of stock options, and access to medical, vision & dental coverage as well as access to a 401(k) retirement plan.

About the Company

General Matter is enriching uranium in America.

Our goal is to design, build, and operate the world’s lowest-cost enrichment services in the United States.  

Our mission is to restore America’s ability to produce nuclear fuel—fuel that will power AI, advanced manufacturing, critical industries, and the next generation of nuclear reactors. 

Ultimately, our work will help power national ambitions and enable a high-energy society. 

We were incubated by Founders Fund, like Anduril and Palantir before us, and are backed by top-tier investors. Our lean, world-class team of engineers and operators is applying a first-principles approach to solving the problem of nuclear fuel production.  

We are a mission-driven company with a culture of urgency, accountability, and transparency. 

Help us build a high-energy society by making the cleanest, safest form of baseload energy the most affordable.

About This Role

We are seeking a Fluid Systems Engineer to lead the design, analysis, and deployment of fluid systems for our uranium enrichment facility.

This role is responsible for developing highly reliable, manufacturable systems that move, store, and control fluids critical to enrichment operations. You will own systems from early sizing and architecture through detailed mechanical design, testing, and production ramp, working closely with manufacturing, operations, and safety teams.

Responsibilities

• Perform system-level sizing and performance analysis for fluid systems to establish requirements and operating margins.
• Translate requirements into hardware concepts, evaluating architectures and design trades for performance, safety, and manufacturability.
• Design pressurized and unpressurized components and assemblies, producing original CAD models, drawings, and specifications.
• Conduct structural and mechanical analysis to ensure survivability under pressure, thermal, and operational loads.
• Drive design-for-manufacturability improvements to enable efficient, repeatable production.
• Lead first-article builds and work directly with manufacturing teams to establish robust production processes.
• Plan and execute development, qualification, and acceptance testing for critical hardware.
• Define concepts of operations for systems, from commissioning and acceptance testing through steady-state operation.
• Participate in internal and external design reviews with cross-functional partners, suppliers, and stakeholders.

Basic Qualifications

• Evidence of exceptional ability (prior projects, portfolio of work, completed products, etc).
• Bachelor’s degree (or higher) in Mechanical Engineering, Aerospace Engineering, Chemical Engineering, Engineering Physics, or a related field.
• 1+ years of experience in mechanical or fluids system design, analysis, or hardware development.

Preferred Skills and Experience

• Experience with gas dynamics, thermal analysis, and finite element analysis (FEA).
• Hands-on experience with pressurized systems (e.g., valves, regulators, piping, tubing, pressure vessels).
• Experience owning operation-critical hardware from concept through production.
• Proficiency with FEA tools and CAD software such as Plant 3D and Caesar II.
• Comfortable working across disciplines with manufacturing, safety, and operations teams.
• Strong communication, organization, and technical leadership skills.

Additional Requirements

• Ability to work extended hours and weekends as necessary.

Equal Opportunity Employer

General Matter is an Equal Opportunity Employer; employment with General Matter is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

Compensation and Benefits: 

The base salary range for this role is $90,000–$175,000 annually. 

Compensation bands are determined by role, level, location, and alignment with market data. Individual level and base pay is determined on a case-by-case basis and may vary based on job-related skills, education, experience, technical capabilities and internal equity. Please note that the stated salary range is an estimate and may be adjusted based on market conditions, business needs, or other factors. In addition to base salary, for full-time hires, you may also be eligible for long-term incentives, in the form of stock options, and access to medical, vision & dental coverage as well as access to a 401(k) retirement plan.

About the Company

General Matter is enriching uranium in America.

Our mission is to restore our country’s ability to make nuclear fuel. Our fuel will help power AI, manufacturing, and other critical industries. It will power our next generation of reactors. Ultimately, it will power our national ambitions.

We were incubated by Founders Fund, like Anduril and Palantir before us, and we are backed by top tier investors. 

Our lean, world-class team of engineers and operators is applying a first-principles approach to solving the problem of nuclear fuel production.

We are a mission-driven company with a culture of urgency, accountability and transparency.

About This Role

The Test Engineer owns test infrastructure and supports test design, setup, and operations to validate hardware developed by the design engineers. This position validates that all hardware designs meet requirements during development and ensures long-term system and hardware reliability.

Responsibilities:

• Design, develop, and maintain custom test solutions and data acquisition systems for in-house developed mechanical and electrical hardware.
• Lead design reviews, run data analysis, visit vendors, define and execute hardware test plans.
• Work closely with responsible design and manufacturing engineers to drive reliability improvements
• Build test equipment, implement test automation, analyze failures and execute qualification campaigns.

Basic Qualifications:

• Bachelor's degree in mechanical, electrical or similar engineering field.
• 2–3 years of experience in hardware development, test engineering, or similar role.
• Ability to design and fabricate test fixtures, adapters, and other tools needed for testing.
• Experience with digital-hardware communication/integration.

Preferred Skills and Experience:

• Experience performing finite element analysis (FEA).
• Experience with test equipment (data acquisition, instrumentation, pumps, valves, and automation).
• Experience with the building and testing of fluid and/or electrical systems.

Additional Requirements:

• Ability to work extended hours and weekends as necessary.

Equal Opportunity Employer

General Matter is an Equal Opportunity Employer; employment with General Matter is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

Compensation and Benefits

The base salary range for this role is $80,000-$170,000 annually. 

Compensation bands are determined by role, level, location, and alignment with market data. Individual level and base pay is determined on a case-by-case basis and may vary based on job-related skills, education, experience, technical capabilities and internal equity. Please note that the stated salary range is an estimate and may be adjusted based on market conditions, business needs, or other factors. In addition to base salary, for full-time hires, you may also be eligible for long-term incentives, in the form of stock options, and access to medical, vision & dental coverage as well as access to a 401(k) retirement plan.