About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
Skills: Materials Characterization, Optical Microscopy, Electron Microscopy, Mechanical Property Evaluation, Root Cause Investigation
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
Skills: Test Rig Assembly, Instrumentation Integration, Data Acquisition Systems, Mechanical Aptitude, Electrical Wiring
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
Skills: Test Rig Assembly, Instrumentation Integration, Data Acquisition Systems, Mechanical Fabrication, Electrical Wiring
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
Senior, Thermo-Mechanical Design Engineer - Reactor Cavity Cooling Systems
Los Angeles, California, United States · On-site
$140k–$185k/yr
Senior$126M raised
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
Skills: Systems Engineering, Thermodynamics, Energy Systems, Engineering Economics, Project Management
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
Skills: Electrical Architecture, Power Distribution, Instrumentation and Controls, Hardware-based Control Systems, R&D Testing
About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, …
Skills: Python, C++, Data Acquisition, Hardware Integration, Test Automation
Sign up with Clera and we'll reach out the moment a role actually fits you — no more spraying applications into the void.
$115k–$150k/yr
Full-time
bachelor degree
Equity, Stock Option Package
Posted 21d ago
~40 hrs/week
Responsibilities
Develop and qualify materials for reactor systems through physical, thermal, and mechanical testing. Collaborate with cross-functional engineering teams to integrate materials and optimize manufacturing processes.
Requirements
Requires a Bachelor's degree in Materials or Mechanical Engineering with at least 2 years of experience in materials engineering. Proficiency in microscopy and root cause failure analysis is essential.
Full job description
About Us
At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, elevate global living standards, and expand humanity's presence in outer space. To achieve our mission, we’re building mass-producible, inherently safe, deployable microreactors that can be used terrestrially, underwater, and in space.
Formed in 2023, the Antares team hails from SpaceX, The White House, MIT, Rigetti Computing, The Air Force, General Atomics, Relativity Space, Ursa Major, and National Laboratories like Los Alamos, Idaho, and Oak Ridge. Antares has raised over $600M in venture capital from top-tier investors and has over $13M in government funding.
About the Team
As a Materials Engineeryou will aid in the development and qualification of all materials in Antares’ reactor systems. This will consist of developing experiments, processes, and quality control as well as working with vendors and collaborators to identify and rectify critical gaps in material behavior at our operating conditions. This position requires the ability to learn quickly and develop a deep understanding of a wide range of materials – including ceramics and metallic alloys – such that you become the go-to subject matter expert at the company. The ideal candidate will apply fundamental knowledge of materials science to the practical applications of manufacturing in a fast-paced environment while also pushing innovation for the next generation of materials – driving Antares to be a recognized leader in nuclear materials.
Roles & Responsibilities:
Partake in the development and qualification for all materials in the reactor, including lifetime testing, cross-institutional collaboration, and property evaluation.
Design and conduct physical, thermal, and mechanical testing of materials that replicates the reactor environment.
Employ statistical methods to systematically evaluate effects of process variables and environmental effects on materials properties.
Materials characterization including root cause investigations of failure modes.
Interface with manufacturing, neutronics, mechanical, testing, and quality engineers to integrate materials into the overall system, define limits to operating conditions based on material properties, and optimize processes.
Basic Qualifications:
Bachelor’s degree in Mechanical Engineering, Materials Engineering, or a related field.
2+ years of experience in materials engineering.
Proficiency in optical and electron microscopy as well as mechanical property evaluation.
Go-getter attitude – you’ll find a way to get it done.
Preferred Skills and Experience:
3+ years demonstrated experience as part of integrated team in a production setting.
Knowledge of radiation effects in materials.
Knowledge of stainless steel, Ni based superalloys, and ceramics.
Coatings experience.
Exceptional communication skills to work effectively across teams and convey technical information to non-specialists.
Additional Requirements:
Ability to work long hours and weekends as necessary to support critical milestones
Location
We are located in Torrance, CA in a 322,000 square foot, brand new facility featuring large open spaces for team collaboration, R&D, and production, as well as easy access to the 405, 105, and 110 freeways. Our facility is in the heart of Los Angeles' vibrant emerging tech ecosystem alongside many other high growth startups and enterprises.
Culture
At Antares, we like to specifically tie each role to our founding document’s set of values–here are the top five cultural values we think you should believe at your core to be successful:
Think in Systems - Energy and Defense are complex ecosystems with numerous stakeholders with competing priorities, conflicting policies, perverse incentives, and emergent and path-dependent properties. First principles thinking alone is insufficient. Think probabilistically and then take action. “If you want to be certain, then you are apt to be obsolete.” Over-optimizing the components often degrades the system
Obsess over the End User - The customer and end user are often not the same. We will never build globally competitive commercial products if we lose sight of our end users and their entire interaction with the product life cycle
Be Unconstrained by Convention - Our only limits are the laws of physics. Many, even experts, will say what we are working on is impossible. They said the same about SpaceX reusing rockets. Generationally impactful companies, by definition, must accomplish the seemingly impossible. If it were easy, it would have already been done. Never shy away from a solution because it has never been tried before, and never choose to do something because that's “how it's always been done”
Go Where the Work Is - Never miss a chance to meet a customer, user, or stakeholder face to face, even if that means hopping on a plane. If you can’t make it, find a teammate who can channel your intentions and go in your place. Deep work can be done from anywhere, but we believe teams are built in person, and aim to maximize our time together
Operate in the Grey - Embrace nuance in pursuit of truth. Question every fundamental assumption
Equal Opportunity
Antares is an Equal Opportunity Employer. Employment decisions are based solely on merit, competence, and qualifications, without regard to 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.
ITAR Requirements
To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State. Learn more about the ITAR here.
Related keywords
Nuclear EnergyMicroreactorsMaterials ScienceRadiation EffectsNuclear MaterialsFailure ModesProperty EvaluationManufacturingITARNeutronicsQuality ControlR&DSeries B StartupClean Energy
Energy abundance unlocks progress. It powers missions, grows economies, strengthens national security, and expands what’s possible on Earth and beyond. But in the places where power is most critical, it’s often the hardest to deliver. That’s the problem we’re solving.
At Antares, we’re building compact nuclear microreactors to deliver reliable, mobile energy where it’s needed most: remote military bases, austere industrial sites, and, one day, deep space and underwater missions. The U.S. nuclear industry hasn’t seen true momentum in decades. We’re moving it forward with urgency, humility, and a commitment to building what’s needed now.
Our team includes engineers and operators from SpaceX, Relativity Space, Ursa Major, the White House, MIT, Rigetti Computing, and the U.S. Air Force. Backed by over $600M from top-tier investors, we’re focused on shipping hardware, not hypotheticals.
Offices: Los Angeles, CA 90503, US · 215 Richland Ave E, Aiken, South Carolina 29801, US · 545 Shoup Ave, Idaho Falls, Idaho 83402, US
Energy abundance unlocks progress. It powers missions, grows economies, strengthens national security, and expands what’s possible on Earth and beyond. But in the places where power is most critical, it’s often the hardest to deliver. That’s the problem we’re solving.
At Antares, we’re building compact nuclear microreactors to deliver reliable, mobile energy where it’s needed most: remote military bases, austere industrial sites, and, one day, deep space and underwater missions. The U.S. nuclear industry hasn’t seen true momentum in decades. We’re moving it forward with urgency, humility, and a commitment to building what’s needed now.
Our team includes engineers and operators from SpaceX, Relativity Space, Ursa Major, the White House, MIT, Rigetti Computing, and the U.S. Air Force. Backed by over $600M from top-tier investors, we’re focused on shipping hardware, not hypotheticals.
Offices: Los Angeles, CA 90503, US · 215 Richland Ave E, Aiken, South Carolina 29801, US · 545 Shoup Ave, Idaho Falls, Idaho 83402, US