Technical Program Manager

ABOUT 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, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 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 leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is building a first-of-its-kind reactor, and delivering it to some of the most demanding customers in the world. As a Technical Program Manager in Radiant’s Commercial organization, your job is to deliver on our customer contracts. You will own the end-to-end process, serving as the single point of accountability for all contract deliverables, from technical milestones through reactor deployment. Within Radiant, your key points of contact will be the licensing, state engagement, engineering, and manufacturing teams. This role has full responsibility for delivering on Radiant’s most important customer projects. You will operate with wide latitude and direct access to company leadership. Responsibilities & Duties - Drive contract milestones to completion. - Manage the timely execution of regulatory, engineering, and siting deliverables. - Serve as the primary interface with contracting officers, program offices, installation personnel, and end users. - Architect and maintain program integrated master schedules and cost baselines, ensuring internal teams and subcontractors are aligned to contract obligations. - Manage contract compliance including reporting requirements and milestone billing; support negotiation of contract modifications and change orders. - Independently identify, assess, and drive resolution of programmatic risks and cross-functional dependencies. - Own program financial performance, including budget and resource forecasting. - Stand up and refine the project management processes, tools, and reporting cadence needed to provide clear visibility to company leadership and consistent milestone updates to customer partners. - Carry the customer’s voice back to Radiant, shaping engineering and deployment decisions. Required Skills and Qualifications - 5-7+ years of experience in program management or project management. - Experience managing programs requiring the delivery of complex capital equipment or large-scale industrial systems. - Proven ability to manage programs with significant technical complexity, multiple parallel workstreams, and…