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 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.