Firmware 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. 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 Antares is seeking a Firmware Engineer to build the embedded software that enables our first-of-a-kind microreactor hardware to operate reliably in real time. This firmware sits at the interface between custom electronics and reactor control infrastructure, translating sensor signals, device commands, timing requirements, diagnostics, and fault responses into dependable behavior at the hardware level. In this role, you will develop firmware for embedded controllers, instrumentation electronics, data acquisition systems, and test hardware. You will help define how reactor hardware is initialized, monitored, commanded, diagnosed, and protected across development, integration, and qualification environments. You will work closely with electrical, controls, reactor software, safety, and test teams to design, implement, bring up, and validate firmware that interacts directly with sensors, actuators, custom electronics, communication buses, control algorithms, and hardware-in-the-loop systems. Your work will be central to ensuring Antares’ reactor hardware can be safely operated, tested, diagnosed, qualified, and eventually deployed. Key Responsibilities - Design, develop, test, and maintain firmware for reactor instrumentation, control, monitoring, and electrical support systems. - Develop embedded software in C/C++ for microcontrollers, embedded processors, and real-time hardware platforms. - Bring up new hardware, debug board-level issues, and validate firmware behavior using oscilloscopes, logic analyzers, multimeters, power supplies, and other lab equipment. - Implement communication interfaces such as SPI, I2C, UART, CAN, Ethernet, RS-485, or similar protocols. - Develop firmware for sensor acquisition, actuator control, telemetry, diagnostics, fault detection, and system health monitoring. - Collaborate with electrical engineers on schematics, board design reviews, signal integrity concerns, interface definitions, and hardware/software requirements. - Collaborate with systems, software, test, and licensing teams to ensure firmware supports safety, reliability, and regulatory requirements. - Participate in design reviews and ensure firmware designs are technically sound, testable, and traceable. - Support hardware-in-the-loop and hardware-in-the-loop testing, automated test frameworks, data acquisition systems, and integration campaigns. - Develop firmware test plans, verification procedures, and documentation for configuration-controlled hardware and software releases. - Analyze failure modes, define safe states, and implement fault-handling logic for embedded systems. - Drive root-cause investigations for firmware, electrical, and integration issues through bench testing and system-level debugging. Basic Qualifications - Bachelor’s degree in Computer Science, Computer Engineering, Software Engineering, or a related technical field. - 2+ years of experience developing production software in C, C++, Python, Rust, or similar languages for hardware-integrated, distributed, embedded, robotics, aerospace, automotive, industrial, or mission-critic…