Radiant Industries is an El Segundo, CA-based startup developing Kaleidos, a portable, containerized nuclear microreactor. Portable nuclear power with rapid deploy capability can replace diesel generators used today to provide critical asset support for hospitals, datacenters, and military bases or to power microgrids at remote sites. Radiant’s unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory-constructable microreactors leveraging existing, well-qualified materials. Radiant is on a fast track to demonstrate the first fueled operation of a new commercial nuclear reactor design, just two years from now.

**Senior Nuclear Engineer**

Radiant is seeking a highly motivated senior nuclear engineer responsible for developing nuclear engineering solutions for our Kaleidos microreactor. This may include areas such as transportation, fuel handling, criticality safety, reactor physics modeling, and others. You will lead engineering initiatives, provide mentorship and guidance to junior engineers, and drive trade studies, strategic direction, and solutions as priorities shift in a fast-paced startup environment.

**Responsibilities & Duties**

- Ownership of nuclear design and analysis focus areas, for example:
    - Shielding: Assessing transport, operation, self-activation, environmental activation, and waste categorization, working with both customer and regulatory requirements.
    - Analysis: Run coupled core physics and thermal calculations to refine the thermal model in various scenarios.
    - Mechanical: Assess damage effects and bulk material properties changes due to high flux on ceramics and metals inside the core.
    - Fuel and waste: Model burnup distribution, design burnable absorber, and perform criticality assessments for transport and waste facility compatibility.
    - Reactor Physics: Develop control schemes and design control systems using transient simulations to finalize source sizing and detector selection.
- Apply expertise and knowledge of nuclear industry standards and regulations.
- Develop technical requirements for hardware systems, structures, and components, leading design reviews.
    - Find and develop suppliers for all components.
    - Own subassembly design, manufacturing, and test schedules.
- Provide expertise and feedback on functional areas such as safety and quality via clear and constructive communication to cross functional teams.

**Required Qualifications & Skills**

- Bachelor’s degree in nuclear engineering or equivalent degree from accredited institution.
- 5+ years nuclear engineering industry experience.
- Experience implementing nuclear regulatory requirements.
- Proficient in at least one of the following programming languages: Python, C++, C#, or another scientific computing language.

**Desired Qualifications & Skills**

- Master’s or PhD in nuclear engineering or equivalent degree from accredited institution.
- Subject matter expert in one of following areas: criticality safety, fuel management, and/or radioactive material transportation.
- Self-motivated with strong organizational, written, and oral communication skills.
- Hands-on experience designing hardware and/or performing tests.
- Proficient or advanced in one of following: OpenMC, MCNP, SCALE, MOOSE, Serpent, BISON, RELAP, CFD, Pronghorn, GRIFFIN, or other nuclear software packages
- At least 1 year of software development experience:
    - C, C++, or Python development experience is preferred.

**Employee Benefits for Eligible Employees:**

- Stock: Substantial incentive stock plan for all full time, salaried employees.
- Medical: 100% up to base silver level plan for employee + 50% dependents, offers 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 are offered as employee contributed benefits.
- Free snacks and drinks onsite.
- Flexible PTO policy.

*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.*

*Unfortunately, we are unable to provide visa sponsorship at this time. 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.*

Senior Nuclear Engineer

Radiant Industries is an El Segundo, CA-based startup developing Kaleidos, a portable, containerized nuclear microreactor. Portable nuclear power with rapid deploy capability can replace diesel generators used today to provide critical asset support for hospitals, datacenters, and military bases or to power microgrids at remote sites. Radiant’s unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory-constructable microreactors leveraging existing, well-qualified materials. Radiant is on a fast track to demonstrate the first fueled operation of a new commercial nuclear reactor design, just two years from now.

**Nuclear Engineer**

Radiant is seeking a highly motivated nuclear engineer for an opportunity to work with mentorship and guidance from experienced nuclear professionals in a fast-paced startup environment. The candidate will be responsible for various aspects of nuclear design and analysis as priorities shift and expertise is gained.

**Responsibilities & Duties**

- Ownership of Nuclear design and analysis, examples:
    - Shielding: Transport, Operational, Self-Activation and environmental Activation, Waste Categorization, working with both customer and regulatory requirements
    - Run coupled neutronics and thermal calculations to refine the thermal model in various scenarios
    - Mechanical: Assess damage effects and bulk material properties changes due to high flux on ceramics and metals inside the core
    - Neutronics: Develop control schemes and design control systems using transient simulations to finalize source sizing and detector selection
    - Fuel and Waste: Model burnup distribution, design burnable absorber, and perform criticality assessments for transport and waste facility compatibility
- Develop requirements for hardware systems, structures, and components
    - Create and manage a Bill-Of-Materials (BOM).
    - Find and develop suppliers for all components.
- Own subassembly design, manufacturing, and test schedules.
- Collect requirements, provide expertise and feedback to engineers in other functional areas via clear, constructive communication.

**Required Qualifications & Skills**

- Bachelor’s degree in nuclear engineering or equivalent degree from accredited institution
- Proficient in at least one of the following programming languages: Python, C++, C#, or another scientific computing language

**Desired Qualifications & Skills**

- Self-motivated with strong organizational, written, and oral communication skills
- Competency in distributed software development process
- Hands-on experience designing hardware and/or performing tests
- Related experience with OpenMC, Serpent, MCNP, MOOSE, BISON, RELAP, CFD, Pronghorn, GRIFFIN, or other nuclear software packages
- At least 1 year of software development experience:
    - C, C++, or Python development experience is preferred.
    - Prior use of code repositories, unit testing, performance benchmarking, and software review / release processes.
    - Familiarity with good documentation practices and implementation of style guidelines.

**Employee Benefits for Eligible Employees:**

- Stock: Substantial incentive stock plan for all full time, salaried employees.
- Medical: 100% up to base silver level plan for employee + 50% dependents, offers 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 are offered as employee contributed benefits.
- Free snacks and drinks onsite.
- Flexible PTO policy.

*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.*

*Unfortunately, we are unable to provide visa sponsorship at this time. 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.*

Radiant Industries is an El Segundo, CA-based startup developing Kaleidos, a portable, containerized nuclear microreactor. Portable nuclear power with rapid deploy capability can replace diesel generators used today to provide critical asset support for hospitals, datacenters, and military bases or to power microgrids at remote sites. Radiant’s unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory-constructable microreactors leveraging existing, well-qualified materials. Radiant is on a fast track to demonstrate the first fueled operation of a new commercial nuclear reactor design, just two years from now.

**Infrastructure Engineer**

Reporting to the CTO & Co-Founder, this will be the first dedicated Infrastructure team member that will shape and execute Radiant’s infrastructure strategy. You will support our diverse and critical cloud-based ecosystem of applications and services spanning from digital twin simulations, hardware testing, and data pipelining with a keen eye for high-availability, high performance, and robust security. You will design high level architecture and requirements as well as troubleshoot bottleneck issues and identify improvements. This role is pivotal in enabling Radiant's success in commercializing the world's first portable nuclear microreactor to power remote communities globally.

- Design, deploy and administer our AWS infrastructure.
- Ensure high availability, scalability, reliability and security of backend services and deployed software applications.
- Manage and scale Kubernetes for effective software deployment and container orchestration.
- Manage and optimize Terraform environment.
- Partner closely with an interdisciplinary team to verify nuclear test hardware for functionality and performance.
- Troubleshoot and resolve issues that arise, and maintain a deep commitment to highly reliant, available systems.
- Establish roadmaps, project timelines and detailed documentation.

**Required Qualifications and Skills:**

- 3+ years of devops engineering experience.
- Proficient in Python, Go or Java, with Go or Python preference.
- Proficient in AWS technology and tools such as EC2 and S3.
- Proficient in Terraform.
- Proficiency in containerization technologies such as Kubernetes.
- Experience deploying and maintaining CI/CD pipelines.

**Desired Qualifications and Skills:**

- Experience deploying and maintaining CI/CD pipelines.
- Deep understanding of AWS security practices.
- Experience with monitoring tools such as Grafana.
- Demonstrated experience in hardware and test environments.
- Highly self-driven and motivated and operates successfully both autonomously and collaboratively with teams.
- Excellent communications skills with the ability to effectively collaborate with interdisciplinary and cross-functional teams.
- Enjoys working in fast paced environments and effectively balancing competing priorities.

**Employee Benefits for Eligible Employees:**

- Stock: Substantial incentive stock plan for all full time, salaried employees.
- Medical: 100% up to base silver level plan for employee + 50% dependents, offers 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 are offered as employee contributed benefits.
- Free snacks and drinks onsite.
- Flexible PTO policy.

*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.*

*Unfortunately, we are unable to provide visa sponsorship at this time. 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.*

Infrastructure Engineer

Radiant Industries is an El Segundo, CA-based startup developing Kaleidos, a portable, containerized nuclear microreactor. Portable nuclear power with rapid deploy capability can replace diesel generators used today to provide critical asset support for hospitals, datacenters, and military bases or to power microgrids at remote sites. Radiant’s unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory-constructable microreactors leveraging existing, well-qualified materials. Radiant is on a fast track to demonstrate the first fueled operation of a new commercial nuclear reactor design, just two years from now.

**Head of Software Engineering**

Radiant is seeking an excellent technical and people leader to head our software engineering organization. The software team is the backbone of our Digital Twin infrastructure, enabling reliable, real-time, and performant simulations to validate performance and safety of our systems. You will be responsible for the roadmap, schedule, budget, and execution of software milestones towards our 2026 DOME test and beyond. The ideal candidate has a successful track record of leading high performing teams and seeing an early product mature into a robust, comprehensive software solution. The ideal candidate also has exposure to building software in hardware-centric environments, and has experience building fault-tolerant, highly reliable systems. You will continue to hire and grow the team as software requirements grow and manage DevOps as well.

This role is located onsite in El Segundo, CA.

**Responsibilities and Duties:** **

- Hire, lead, and grow a high performing, exceptional software team.
- Drive software development schedule, budget, and strategy aligned to organizational goals.
- Foster a collaborative culture with a big emphasis on growing responsible engineers who own their work end to end.
- Work closely with cross-functional engineering teams and leaders to understand business requirements and translate them into reliable solutions.
- Oversee the design and scale of the devops organization.

**Required Skills and Qualifications:**

- Bachelors in computer science, computer engineering, or similar discipline.
- 4+ years of software development experience.
- 3+ years leading software teams.

**Desired Skills and Qualifications:**

- Experience in developing software for a hardware product realized from concept to production.
- 1+ years leading and mentoring software managers.
- Proven track record of leading high performing software teams and overseeing software operations, best practices, methodologies, and tools.
- Experience in interdisciplinary technical environments solving complex, ambiguous problems.
- Exceptional ability to pivot from diving deep into technical problems to big picture strategy development.
- Experience with AWS.
- Demonstrated interest in driving the forefront of nuclear energy.

**Employee Benefits for Eligible Employees:**

- Stock: Substantial incentive stock plan for all full time, salaried employees.
- Medical: 100% up to base silver level plan for employee + 50% dependents, offers 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 are offered as employee contributed benefits.
- Free snacks and drinks onsite.
- Flexible PTO policy.

*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.*

*Unfortunately, we are unable to provide visa sponsorship at this time. 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.*

Head of Software Engineering

Radiant Industries is an El Segundo, CA-based startup developing Kaleidos, a portable, containerized nuclear microreactor. Portable nuclear power with rapid deploy capability can replace diesel generators used today to provide critical asset support for hospitals, datacenters, and military bases or to power microgrids at remote sites. Radiant’s unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory-constructable microreactors leveraging existing, well-qualified materials. Radiant is on a fast track to demonstrate the first fueled operation of a new commercial nuclear reactor design, just two years from now.

**Software Simulation Engineer**

The Digital Twin software team is seeking a driven software engineer. The Digital Twin is an innovative real-time simulation system for Kaleidos, spanning from core physics simulation to connecting real hardware and validating performance. This is a critical system utilized by every engineering team in the organization to enable rapid iteration and model safety critical scenarios. We’re looking for a software engineer comfortable developing mission critical software. The ideal candidate will either have experience or be very comfortable understanding thermo-physics concepts while applying best practices for quality software development. You’ll have the opportunity to architect new features, have autonomy in problem solving, work with interdisciplinary teams, and drive Radiant through necessary milestones towards commercializing of the first portable nuclear microreactor.

**Responsibilities and Duties:** 

- Architect and develop Digital Twin software features and blocks.
- Build and optimize performance and process for testing models in accordance to NQA-1 regulations.
- Build new models in conjunction with the Thermo-Mechanical and Nuclear teams to support hardware testing.
- Collect requirements, provide expertise and feedback to engineers, and present design reviews to cross-functional teams.

**Required Qualifications and Skills:**

- Bachelor’s degree in computer science, physics, or similar field from an accredited institution.
- At least 1 year of software development experience in C# or C++.
- Demonstrated understanding of thermal physics first principles.

**Desired Qualifications and Skills:** 

- Double major in computer science and engineering discipline, or graduate degree in chemical, mechanical, or nuclear engineering, physics, or similar field.
- Experience communicating and distilling information with cross-functional teams.
- Experience in software project management.
- Experience and/or exposure to software systems design or architecture.
- Driven, self-motivated, and takes ownership of work end to end.

**Employee Benefits for Eligible Employees:**

- Stock: Substantial incentive stock plan for all full time, salaried employees.
- Medical: 100% up to base silver level plan for employee + 50% dependents, offers 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 are offered as employee contributed benefits.
- Free snacks and drinks onsite.
- Flexible PTO policy.

*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.*

*Unfortunately, we are unable to provide visa sponsorship at this time. 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.*

Software Simulation Engineer

Radiant Industries is an El Segundo, CA-based startup developing Kaleidos, a portable, containerized nuclear microreactor. Portable nuclear power with rapid deploy capability can replace diesel generators used today to provide critical asset support for hospitals, datacenters, and military bases or to power microgrids at remote sites. Radiant’s unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory-constructable microreactors leveraging existing, well-qualified materials. Radiant is on a fast track to demonstrate the first fueled operation of a new commercial nuclear reactor design, just two years from now.

**Senior Embedded Software Engineer**

Radiant is seeking a Senior Embedded Software Engineer to design, develop, and test firmware for instrumentation and control (I&C) systems on the Kaleidos reactor system, hardware-in-the-loop (HITL) test stands, and PLCs. You will develop mission critical, highly performant embedded systems for microcontrollers to interface with sensors and actuators. The candidate will be comfortable working in early design architectural stages and owning through production. You will have the opportunity to build mission critical autonomous software control systems for the first commercialized portable nuclear microreactor.

**Responsibilities and Duties:** 

- Design and build reliable, fault-tolerant firmware for test systems and production hardware.
- Develop and bring up real-time operating systems and drivers for I&C modules.
- Lead design reviews, review and iterate on feedback, and partner closely with cross-functional teams in nuclear, thermomechanical, and electrical.
- Be a responsible engineer from architectural design through test, build and implementation.
- Optimize and build diligence into robust testing plans and documentation.

**Required Qualifications and Skills:**

- Bachelor’s degree in computer engineering, computer science, electrical engineering, or similar discipline from accredited institution.
- 5+ years of industry experience on embedded firmware, including 1+ year of design and architecture experience.
- Proficient in C++ and Python.

**Desired Qualifications and Skills:** 

- Experience with ThreadX or RISC-V.
- Experience working with instrumentation and control systems.
- Experience with FPGAs.
- Comfortable taking extreme ownership of responsibilities and domain.
- Strong communication across interdisciplinary teams and distilling deep technical topics to non-technical audiences.
- Comfortable working autonomously and proactively in day-to-day activities.

**Employee Benefits for Eligible Employees:**

- Stock: Substantial incentive stock plan for all full time, salaried employees.
- Medical: 100% up to base silver level plan for employee + 50% dependents, offers 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 are offered as employee contributed benefits.
- Free snacks and drinks onsite.
- Flexible PTO policy.

*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.*

*Unfortunately, we are unable to provide visa sponsorship at this time. 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.*

Senior Embedded Software Engineer

Radiant

Radiant is a clean energy startup building a nuclear microreactor. A climate-friendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. We plan to test our development reactor by 2026 and if successful, it will be the first new commercial reactor design to achieve a fueled test in over 50 years. Our microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios.

Radiant

Open roles