Senior Power Electronics 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 This role owns the high-power electrical architecture of the plant. At the center is the common DC bus that connects the battery energy storage system, reactor power conversion system, and grid-tied inverter through a network of DC/DC converters. As the technical owner of this system, you will define its architecture, establish its performance and fault-handling requirements, lead supplier selection and validation, and drive the roadmap for future power and deployment scaling. Roles and Responsibilities: - Own the common DC bus: Define the architecture that interconnects energy storage, the reactor power conversion system, and the grid-tied inverter through DC/DC conversion — voltage levels, topology, sectionalizing, protection and coordination, grounding and isolation scheme, and the sizing margins behind all of it. - Own the expansion architecture: Define how the DC bus scales from a single unit to a multi-reactor plant: paralleling strategy, fault isolation between units, protection selectivity as available fault current grows, control hierarchy, and what has to be designed in now versus deferred. - Ensure the high voltage system integrates as a system: Verify that components from different vendors behave correctly together across the full range of reactor use cases, and that the whole is stable where the parts are individually fine. - Own HV system functions and their implementation: Battery management, bus precharge, isolation and insulation monitoring, power quality, grid-forming and grid-following operation, controlled and emergency shutdown, load shed, black-start, and failover communications — from definition through implementation and verification. - Own fault behavior across every case that matters: Load drop and rejection, short circuit faults, isolation and ground faults, and converter faults: know what the system does, prove it does that, and make sure protection coordination and control response hold up under each one. - Own the high power distribution test system at Antares HQ: Define and build the rig that lets us test at power. Work with facilities on the power infrastructure to feed it, with the test team on the test cases and campaign, and with the controls infrastructure team on data logging, instrumentation, and automation of repetitive test sequences. - Turn test results into design decisions: Run the campaigns that matter, close the loop on model correlation, and feed what you learn back into architecture and supplier requirements. - Own the power electronics supplier relationships: Energy storage systems, DC/DC converters, grid-tied inverters, and AC/DC converters — you're the technical owner of each: specification, evaluation, design review, integration support, issue escalation, and the long-term relationship. - Drive the electrical development roadmap: Evaluate suppliers and emerging technologies as we push toward higher power output, and make the build-versus-buy and technology-selection calls that shape the next generation of the system. - Shape the equipment pad layout: Work with harnessing and mechanical design…