Radiant
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 failsafe micro‑reactor that can be transported anywhere power is needed and run for up to five years without refueling. Portable nuclear power with rapid deploy capability can replace similar‑sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory‑built micro‑reactors that leverage existing, well‑qualified materials.
Founded in 2020, Radiant is on track to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028.
Senior Software Engineer Radiant seeks a driven Senior Software Engineer to work on a variety of internal tools and platforms. In this role, you will design, build, maintain, and scale the internal systems and platforms that support simulation, hardware testing, data processing, and analysis. You will work in an interdisciplinary environment with a high degree of ownership and drive milestones forward to unlock commercialization of the first mass‑produced nuclear reactor.
Responsibilities and Duties
Architect, build, and maintain a variety of internal tools and platforms
Help define and build our simulation and analysis stack to support the development of Digital Twins
Collaborate across teams to integrate new and existing software with a variety of software and hardware platforms
Mentor and be a technical leader: review code and provide feedback, and establish best practices (documentation, testing, deployment automation)
Required Qualifications and Skills
Bachelor’s degree in computer science or engineering
5–8+ years of professional experience in Python, C++, C#, or similar object‑oriented programming languages
Familiarity with Git, Docker, and common CI/CD frameworks
Desired Qualifications and Skills
Highly self‑motivated with strong communication skills
Experience testing software and hardware systems
Experience with embedded and distributed software development and familiarity with common design patterns
Interest in physics, hardware, and electrical engineering
Additional Requirements
Must be willing to work extended hours and weekends as necessary to accomplish our mission
Must work 100% onsite at El Segundo HQ
Total Compensation and Benefits Radiant's new hire compensation package includes base salary, substantial equity grants, and comprehensive benefits. Total compensation and level are determined through a holistic evaluation of your interview performance, experience, education, and qualifications.
Benefits and Perks for Eligible Employees
Stock: Substantial incentive stock plan for all full‑time employees
Medical: 100% up to base silver level plan for employee + 50% dependents, with options up to Platinum plans
One Medical: Sponsored memberships for employees and their dependents
Vision: 100% top‑tier plan coverage + 50% for dependents
Dental: 100% top‑tier plan coverage, orthodontia extra, 50% for dependents
Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee‑contributed benefits
8‑weeks of paid parental leave for all parents; additional paid pregnancy leave for CA employees
Daily catered lunch; free snacks and drinks
Flexible PTO policy and remote workday allocation
Company and team‑bonding events, happy hours and in‑person camaraderie
Beautiful El Segundo headquarters close to the Pacific Ocean
EEO Statement We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.
Visa Sponsorship Unfortunately, we are unable to provide visa sponsorship at this time.
Export Control This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.
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Founded in 2020, Radiant is on track to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028.
Senior Software Engineer Radiant seeks a driven Senior Software Engineer to work on a variety of internal tools and platforms. In this role, you will design, build, maintain, and scale the internal systems and platforms that support simulation, hardware testing, data processing, and analysis. You will work in an interdisciplinary environment with a high degree of ownership and drive milestones forward to unlock commercialization of the first mass‑produced nuclear reactor.
Responsibilities and Duties
Architect, build, and maintain a variety of internal tools and platforms
Help define and build our simulation and analysis stack to support the development of Digital Twins
Collaborate across teams to integrate new and existing software with a variety of software and hardware platforms
Mentor and be a technical leader: review code and provide feedback, and establish best practices (documentation, testing, deployment automation)
Required Qualifications and Skills
Bachelor’s degree in computer science or engineering
5–8+ years of professional experience in Python, C++, C#, or similar object‑oriented programming languages
Familiarity with Git, Docker, and common CI/CD frameworks
Desired Qualifications and Skills
Highly self‑motivated with strong communication skills
Experience testing software and hardware systems
Experience with embedded and distributed software development and familiarity with common design patterns
Interest in physics, hardware, and electrical engineering
Additional Requirements
Must be willing to work extended hours and weekends as necessary to accomplish our mission
Must work 100% onsite at El Segundo HQ
Total Compensation and Benefits Radiant's new hire compensation package includes base salary, substantial equity grants, and comprehensive benefits. Total compensation and level are determined through a holistic evaluation of your interview performance, experience, education, and qualifications.
Benefits and Perks for Eligible Employees
Stock: Substantial incentive stock plan for all full‑time employees
Medical: 100% up to base silver level plan for employee + 50% dependents, with options up to Platinum plans
One Medical: Sponsored memberships for employees and their dependents
Vision: 100% top‑tier plan coverage + 50% for dependents
Dental: 100% top‑tier plan coverage, orthodontia extra, 50% for dependents
Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee‑contributed benefits
8‑weeks of paid parental leave for all parents; additional paid pregnancy leave for CA employees
Daily catered lunch; free snacks and drinks
Flexible PTO policy and remote workday allocation
Company and team‑bonding events, happy hours and in‑person camaraderie
Beautiful El Segundo headquarters close to the Pacific Ocean
EEO Statement We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.
Visa Sponsorship Unfortunately, we are unable to provide visa sponsorship at this time.
Export Control This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.
#J-18808-Ljbffr