Principal Embedded Software Engineer

About the Company

Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor designed to provide critical power to hospitals, data centers, and remote sites.

Responsibilities

• Define and own the embedded software architecture for I&C systems
• Lead design and development of reliable, fault-tolerant embedded software for production hardware
• Develop and bring up new drivers for I&C hardware across sensing and actuation subsystems
• Serve as the senior technical voice in design reviews and surface systemic risks
• Own the full engineering lifecycle from architecture through test and field implementation
• Establish robust hardware and software testing frameworks and validation methodologies
• Mentor embedded engineers and model technical excellence
• Partner with electrical, controls, and hardware engineering leadership

Requirements

• Bachelor's degree in computer engineering, computer science, electrical engineering, or a related field
• 8+ years of industry experience in embedded software
• Significant ownership of system-level architecture decisions
• Hands-on experience with an RTOS (Zephyr, NuttX, ThreadX, etc.)
• Deep proficiency in embedded C/C++
• Proven track record of influencing technical direction across teams
• Strong communication skills for driving consensus among stakeholders
• Ability to work 100% onsite in El Segundo, CA

Preferred Qualifications

• Experience with Zephyr RTOS at an architectural or maintainer level
• Experience with Simulink Autocode C++ export
• Experience with CMake in large, multi-target embedded builds
• Proficiency in reading hardware schematics and debugging at the hardware/software boundary
• Experience in safety-critical or high-reliability domains (aerospace, defense, medical, nuclear, or industrial)