Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. Rising energy demand is straining the U.S. grid and driving up utility costs, emissions, and interconnection backlogs. Radiant decentralizes energy, producing power close to where it’s used. Its first reactor, Kaleidos, is a factory-built, 1-megawatt, fail-safe microreactor that can be transported by land, sea, or air and runs up to 5 years without refueling. Deployed locally without a decade-long build or permitting fight, Kaleidos provides independent power for critical infrastructure like military bases, data centers, hospitals, and remote sites. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Air Force, Navy, and has pre-order agreements with Equinix, with deployments beginning in 2028.
About the RoleRadiant is seeking a Technical Program Manager, IT and Security, to own visibility and delivery across our IT and security portfolio: eight concurrent programs across three states, including a reactor program at Idaho National Laboratory, a fuel facility and manufacturing plant in Tennessee, and warehouse and office buildouts in Los Angeles.
We have strong technical leaders on each effort. This role sees the whole portfolio, keeps it visible, and holds teams to their commitments. You won't write the SSP or design the network; you'll keep the people who do aligned, unblocked, and delivering against a schedule everyone can see. You'll represent IT leadership in meetings we can't attend, and be the reason nothing quietly slips.
Responsibilities & Duties:Build the system of record for tracking IT and security programs, including the tooling, cadence, and reporting.
Own the operating cadence: recurring IT and security status meetings plus cross-functional reviews with facilities, construction, engineering, and external partners; set agendas, drive to decisions, capture actions, follow up.
Maintain integrated schedules, dependencies, risks, and milestones across all eight concurrent programs; know what is on track, what is at risk, and what needs escalation before anyone asks.
Produce network and architecture diagrams, project charters, status reporting, and executive summaries.
Keep IT scope sequenced with construction alongside the facilities PM and general contractor so structured cabling, MDF/IDF, low voltage, access control, cameras, wireless, and carrier circuits are planned into GC milestones.
Escalate slipping commitments and unresolved blockers to the VP of IT and VP of Cybersecurity early enough to act on them, and represent IT leadership in meetings they cannot attend
Support the CMMC and NIST SP 800-171 program alongside executives: milestone plans, POA&M status, remediation coordination, evidence collection, assessor coordination; technical control decisions stay with the security team.
First 90 days: inventory all eight programs and their owners, stand up the Jira and Confluence structure, publish the first integrated portfolio schedule, and establish the recurring reporting cadence
6+ years in technical program or project management, including IT infrastructure and security programs.
Breadth of IT project experience: site build-outs, infrastructure deployment, IT strategy and roadmap planning, program and project management, vendor selection and contract management, budget ownership, and IT operations.
Hands-on Atlassian administration-built Jira projects, workflows, dashboards, and Confluence spaces that teams actually adopted, not just filed tickets in someone else's instance
Can hold their own in an architecture review; reads and produces network diagrams; understands infrastructure and security concepts; asks the right questions of engineers without needing translation.
Strong written communication skills, producing documentation that engineers respect and executives can act on.
Proven experience fostering a culture of influence, effective stakeholder management, and teamwork.
Regulated environment experience (nuclear, defense, aerospace, life sciences, or similar) including work under compliance frameworks
Prior hands-on IT experience as an IT manager, IT operations, help desk management, systems administration, IT engineering, or information security operations.
Delivered IT infrastructure into new construction or facility buildouts: manufacturing, industrial, healthcare, or multi-site commercial
Exposure to OT and IT convergence in manufacturing or plant settings
Site decommissioning or IT asset disposition experience
Familiarity with CMMC, NIST SP 800-171, or FedRAMP
DOE, national laboratory, or ITAR-controlled environment experience
PMP or equivalent formal project management training
Multi-site or multi-state portfolio experience with regular travel
Must be willing to work extended hours and weekends as necessary to accomplish our mission.
Must work 100% onsite at Radiant's El Segundo HQ.
Travel up to 15%, heavier during site activation windows.
Stock: Substantial incentive stock plan for all full-time 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/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. Remote workday allocation.
Company and team-bonding events, happy hours and in-person camaraderie.
Beautiful El Segundo headquarters close to the Pacific Ocean.
Total Compensation and Benefits
Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant.
The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: [email protected].
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.
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.
