Reactor Software Engineer I/II

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 $130M in venture capital from top-tier investors and has over $13M in government funding.

About the Role

Antares is seeking a Reactor Software Engineer to build the software that operates, tests, and interfaces with our first-of-a-kind microreactor and its hardware-in-the-loop environments. This software sits between reactor controls, instrumentation, operator tools, simulations, and external data systems, collecting live signals, streaming telemetry, executing commands, and helping the system respond predictably to off-nominal conditions.

You will work across a codebase where the same controls and interfaces can run in simulation, on a bench or hardware test stand, and eventually against full-scale reactor hardware. In this role, you will help define data is acquired, validated, routed, displayed, and recorded. You will contribute to how commands are scheduled, gated, confirmed, and executed; and how faults are detected, surfaced, contained, and recovered from.

You will partner with controls, electrical, embedded systems, safety, and test teams to design, implement, and validate hardware-facing software for sensors, data acquisition systems, custom electronics, operator displays, simulations, and HIL/HITL environments. Your work will be central to ensuring the react...