Thermo-Mechanical Engineer II
Listed on 2026-08-26
-
Engineering
Mechanical Engineer
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.
The Antares team hails from SpaceX, the White House, the Pentagon, the Department of Energy, MIT, Rigetti Computing, General Atomics, Relativity Space, Ursa Major, and National Laboratories like Idaho, Oak Ridge, Los Alamos, and Savannah River. Antares has raised over $600M in venture capital from top-tier investors and has hundreds of million-dollars on contract with the military services, NASA, and the Department of Energy.
About the Role
As the Thermal-Mechanical Engineer for Integration of the Power Conversion System (PCS), you will own how heat moves through the Power Conversion System, including the thermal budget and its impact on hardware over time. Your scope runs from the thermal energy budget of the whole system down to the insulation on a single hot-section joint. You will develop the heat rejection and cold-sink architecture that closes the cycle, size and integrate the recuperator, define the thermal configuration of the hot section (insulation, heat-loss budget, surface temperatures, and personnel protection), and hold the thermal interfaces and transient requirements against the major PCS components, the reactor, and the safety systems.
You are responsible for managing temperature-related life-limited hardware including mitigations, inspection procedures and processes, and a maintenance plan that manages that risk. You will participate in testing and data reviews for test rigs, full-scale hardware, and deployed reactors. You will drive instrumentation placement, correlate your models against what the PCS actually does, and take the delta back into the design.
The ideal candidate is fluent in heat transfer across conduction, convection, and radiation, has sized real thermal hardware rather than only analyzed it, and is comfortable owning the heat-loss budget and the cold-sink margin and working with component owners to ensure thermal performance is met. Experience with high-temperature power cycles, creep and thermal-mechanical fatigue life, or bringing first-of-a-kind hardware through thermal commissioning is a strong differentiator.
Key Responsibilities:
Own thermal management and thermal energy budget of the Power Conversion System and close the loop with cycle performance on parasitic losses.
Develop the heat rejection and cold-sink architecture, sizing and integrating the recuperator and heat rejection against site and ambient conditions.
Define the thermal configuration including insulation selection and design, heat-loss budget, surface temperatures, instrumentation, and personnel protection.
Manage thermal interfaces and thermal transient requirements for major PCS components, reactor, and safety systems.
Support test rig design and instrumentation placement. Utilize collected data to improve component life and performance.
Engineer components for high-temperature and high-stress service using metals and advanced materials, in partnership with materials and structural analysis.
Work with the team to develop inspection and maintenance plans that manage risk on thermal-mechanically life-limited.
Work with Mechanical, Electrical, Safety, and Nuclear teams to ensure the designs meet the overall objectives and requirements.
Basic Qualifications:
Bachelor's degree in Mechanical, Aerospace, Nuclear, or a related engineering discipline
2+ years of full-cycle engineering experience for Engineer II
Experience performing thermal analysis (hand calculations and FEA or CFD) to size, configure, or qualify hardware
Experience designing thermal management hardware for high-temperature systems, such as insulation systems, heat-loss budgets, or thermal isolation
Experience sizing or integrating heat exchangers or a heat rejection path against real…
(If this job is in fact in your jurisdiction, then you may be using a Proxy or VPN to access this site, and to progress further, you should change your connectivity to another mobile device or PC).