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Design, model, and analyze advanced heat pipe systems for microreactors from concept through production. Develop manufacturing methods, test procedures, and reliability limits to ensure high-performance thermal management.
Requires a Bachelor's degree in Mechanical, Aerospace, or Nuclear Engineering with 2+ years of experience in thermal systems and modeling software. Preferred candidates have a Master's degree and expertise in high-temperature systems (500°C+) and sodium handling.
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.
As a Thermo-Mechanical Design Engineer, you will play a key role in the development, design, qualification, and deployment of advanced heat pipe systems for cutting-edge applications. You will work closely with the Heat Pipe Responsible Engineer and cross-functional teams to mature technologies from concept through production. The ideal candidate will drive innovation and ensure the highest standards in heat pipe technology, contributing to next-generation sustainable energy solutions.
This role is required to be onsite in Torrance, CA.
Perform design, modeling, and analysis of heat pipe systems, ensuring compatibility with interfaces in their intended applications
Support development of manufacturing methods for prototyping and mass manufacturing of heat pipes
Support development of test articles, stands, and procedures for validating the limits of heat pipe performance and life characteristics
Coordinate with internal teams and external stakeholders to drive the execution of customer requirements into delivered hardware products
Define operating procedures and limits for heat pipes to inform end users of performance envelope
Investigate heat pipe failure and define reliability limits; integrate fixes rapidly
Bachelor’s degree in Mechanical / Aerospace Engineering, Nuclear Engineering, or a related physics-based field
2+ years of experience in engineering, with a focus on thermal or heat transfer systems
Demonstrated experience with thermal modeling software (e.g., COMSOL, ANSYS)
Master’s in Nuclear Engineering, Thermal Sciences, or Mechanical /
Aerospace Engineering
Knowledge of materials science as it applies to alloy selection for heat transfer and structural properties
Demonstrated knowledge in simulation of high temperature 2-phase flow fields
Demonstrated expertise in heat pipe design, analysis, manufacturing, and test
Strong understanding of nuclear safety standards, testing protocols, and regulatory requirements
2+ years of experience in high temperature (500°C+) systems, including prior work with heat pipe technology
Experience with sodium purification and material handling
Exceptional communication skills to work effectively across teams and convey technical information to non-specialists
Ability to work long hours and weekends as necessary to support critical milestones.
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.
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
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.
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.
We build microreactors for critical missions.
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
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