The posting, in Antares's own words
archived Oct 23, 2026About 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 a Mechanical Design Engineer in the Mission Engineering team, you will primarily own hardware associated with nuclear power systems in space and on the surface of the Moon and Mars. As the Responsible Engineer (RE) on space with the expectation of taking hardware from clean sheet design to build, dev test, qualification, and integration. You will be responsible for the entire life cycle of your hardware and system, interfaces to and from other systems, how your hardware fits into the larger system, sourcing, building, testing, and designing improvements for a first of a kind system. You’ll drive trades on system layout, interfaces, packaging, working closely with cross-disciplinary teams to refine configurations and close design loops. Your responsibilities will span CAD design, system analysis, leading design reviews, precise definition of thermal and mechanical interfaces, requirements ownership and decomposition, and manufacturability / scalability of your design.
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Roles and Responsibilities:
Own a subsystem and related hardware as part of the larger space nuclear system. Drive system-level layout, requirements definition/decomposition, build/test cycles, defend decisions across all phases of design, take concept through CDR and onward. Own CAD models, manage configurations, produce drawings, DFMEA, etc. Drive cross-discipline alignment and trade studies. Coordinate closely with other teams/people (nuclear, thermal, structures, manufacturing, quality) to ensure a system architecture that satisfies mission/product requirements. Develop a clean sheet design through hardware procurement and dev/qual testing. Support design reviews and integration/test planning for hardware, define manufacturing plan and generate work instructions as needed.