Radiant is an El-Segundo, CA-based 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. Radiant's goal is to bring one of the world's first factory-constructed microreactors to market. 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.
Senior Manager, Technical Program Management
Radiant is seeking a Senior Manager, Technical Program Management to lead the strategic execution of complex engineering programs critical to delivering the world’s first portable nuclear microreactor. This high-visibility role will oversee cross-functional program planning, alignment, and execution across Radiant’s engineering, operations, and leadership teams.You will drive the delivery of integrated, multi-disciplinary technical initiatives — aligning timelines, resources, and milestones in service of our mission to deploy a new commercial reactor design for fueled operation by 2026.
This role requires an exceptional aptitude for proactively spotting roadblocks and pre-emptively aligning resources to remove those blocks, thereby bringing clarity, structure, and momentum to complex, high-stakes efforts.
Responsibilities and Duties:
- Drive company-wide technical programs and own the technical outcomes. You will be responsible for everything from planning through execution, ensuring delivery of key milestones across design, prototyping, testing, and deployment.
- Partner with executive leadership to set priorities, develop integrated roadmaps, and drive investment decisions.
- Foster new links between teams by leading cross-functional collaboration with engineering, operations, safety, regulatory, and commercial teams to ensure synchronization of goals and resources.
- Establish and manage program-level risk frameworks, identifying critical dependencies, bottlenecks, and failure modes early — and working with teams to mitigate them decisively.
- Communicate program status, challenges, and strategy updates clearly to executive stakeholders and external partners, all while holding each and every stakeholder accountable within defined frameworks.
Required Qualifications:
- 8+ years of experience in technical program management, with increasing levels of leadership responsibility.
- Proven track record managing large-scale, interdisciplinary engineering programs — ideally involving both hardware and software – on time, and on budget.
- Strong familiarity with engineering development lifecycles in high-regulation, high-risk domains (e.g., aerospace, energy, defense, or automotive).
- Demonstrated success in aligning executive and technical stakeholders around complex initiatives with tight timelines.
- Experience in creating and managing budgets, schedules, and resource plans across multiple teams or departments.
- Exceptional communication, influence, and leadership skills; able to drive accountability and foster alignment in a fast-paced startup environment.
Desired Qualifications:
- Engineering background or technical literacy in nuclear, aerospace, or hardware-intensive systems (ideally as an RE/Responsible Engineer).
- Prior experience in productizing first-of-a-kind (FOAK) technologies or regulated industrial systems.
- Deep commitment to mission-driven work and a passion for accelerating clean energy solutions.
Key Traits:
- Grit: Unflappable perseverance in the face of strong, sustained project headwinds. An unstoppable momentum advancing ever closer to the end-goal.
- Win Others Over: Persuade, influence, and convert your counterparts into new ways of thinking by steadily building rapport over time.
- Paranoia: Having a persistent, nagging feeling that all may not be as it seems. Constantly expect the unexpected, and prepare for all possible outcomes.
- Independently Drive Results: Harness your willpower to push projects through to fruition with minimal hand-holding, and a passion for owning the final outcome.
Additional Qualifications:
- Must be willing to work extended hours and weekends as necessary to accomplish our mission.
- Must work 100% onsite at El Segundo HQ.
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.
Life at Radiant
Radiant is a team of innovators and communicators creating digital products that bring out the best in people, families and communities. At Radiant we believe in human light - the raw potential within each of us to do extraordinary good.
Thrive Here & What We ValueFlexible PTO policy | Free snacks and drinks onsite | Employee benefits for eligible employees (stock, medical, vision, dental, voluntary life, accident, hospital, critical illness, commuter, FSA) | Equal opportunity employer | Unable to provide visa sponsorship at this time.</s> | 1. Substantial incentive stock plan for all full time, salaried employees. | 2. 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. | 3. One Medical: Sponsored memberships for employees and their dependents. | 4. Vision: 100% top tier plan coverage + 50% for dependents. | 5. Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits. | 6. Free snacks and drinks onsite. | 7. Flexible PTO policy.</s> | 1. Flexible PTO policy | 2. Free snacks and drinks onsite | 3. Employee Benefits for Eligible Employees: Stock, Medical, Vision, Dental, Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits.</s> | Free snacks and drinks onsite</s> | 4. Equal Opportunity Employer | 5. Access to technology that is subject to U.S. export controls.</s> | 3. Employee benefits for eligible employees include stock, medical, vision, dental, voluntary life, accident, hospital, critical illness, commuter, and FSA plans</s> | 2. One Medical: Sponsored memberships for employees and their dependents. | 3. Flexible PTO policy. | 4. Free snacks and drinks onsite. | 5. 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. | 6. Unfortunately, we are unable to provide visa sponsorship at this time.</s> | Radiant is an El-Segundo, CA-based clean energy startup building a nuclear microreactor. | 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. | Plan to test 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. | Goal is to bring one of the world's first factory-constructed microreactors to market. | Microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios.</s> | Medical benefits for employees and dependents | Vision benefits for employees and dependents | Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits</s> | Vision: 100% top tier plan coverage + 50% for dependents</s> | 1. Flexible PTO policy. | 2. Free snacks and drinks onsite. | 4. 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. | 5. 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.</s> | 4. 100% top tier plan coverage + 50% for dependents for medical, dental, and vision insurance | 5. Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits.</s> | 3. Employee benefits for eligible employees, including stock incentives, medical coverage, dental coverage, vision coverage, voluntary life, accident, hospital, critical illness, commuter and FSA options</s> | 3. Employee Benefits for Eligible Employees (Stock, Medical, Vision, Dental) | 5. No Visa Sponsorship at This Time</s> | Radiant is 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. | Radiant offers employee benefits such as stock incentives, medical and dental coverage, vision coverage, voluntary life, accident, hospital, critical illness, commuter and FSA plans. | Radiant provides free snacks and drinks onsite and has a flexible PTO policy.</s> | 4. Equal Opportunity Employer</s> | Employee benefits for eligible employees: stock, medical, vision, dental, voluntary life, accident, hospital, critical illness, commuter, and FSA are offered as employee contributed benefits.</s> | 3. 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. | 4. One Medical: Sponsored memberships for employees and their dependents. | 5. Vision: 100% top tier plan coverage + 50% for dependents.</s> | 5. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. | 6. Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits. | 7. Free snacks and drinks onsite. | 8. Flexible PTO policy. | 9. 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. | 10. 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.</s> | 1. Substantial incentive stock plan for all fulltime salaried employees | 4. Flexible PTO policy.</s> | Free snacks and drinks onsite.</s> | 1. Radiant is an ElSegundo, CA-based clean energy startup building a nuclear microreactor. | 2. Climatefriendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. | 3. Plan to test 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. | 4. Goal is to bring one of the world's first factoryconstructed microreactors to market. | 5. Microreactor can bring power to remote parts of the world and provide backup power for lifesaving applications in hospitals or disaster-relief scenarios.</s> | Employee benefits for eligible employees, including stock incentives, medical coverage, dental coverage, vision coverage, voluntary life, accident, hospital, critical illness, commuter, and FSA options.</s> | 3. One Medical Sponsored Memberships for Employees and Their Dependents | 5. Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are Offered as Employee Contributed Benefits</s> | 1. Fastpaced and high-growth startup | 2. Willingness to work extended hours and weekends as necessary to accomplish the mission. | 3. Flexible PTO policy.</s> | Employee benefits for eligible employees: stock, medical, vision, dental, voluntary life, accident, hospital, critical illness, commuter, and FSA</s> | 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. | Radiant's goal is to bring one of the world's first factory-constructed microreactors to market. 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.</s> | Employee benefits for eligible employees, including stock incentives, medical coverage, dental coverage, vision coverage, voluntary life, accident, hospital, critical illness, commuter and FSA plans</s> | Employee benefits for eligible employees include stock, medical, vision, dental, voluntary life, accident, hospital, critical illness, commuter, and FSA plans.</s> | Flexible PTO policy</s>
