Senior Material Planner

About Radiant

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 Role

Radiant is seeking a proactive Senior Material Planner to own material planning across the full lifecycle of our micro nuclear reactors. This role partners with Engineering to translate reactor designs into a company-wide planning bill of materials and works alongside the Mission Planning team to stand up Materials Resource Planning (MRP) within our new Enterprise Resource Planning (ERP) system. You will manage key part attributes — lead times, order quantities, and safety stock — to keep material plans accurate across the build. You will coordinate closely with Production to ensure make/buy decisions in MRP reflect the current build sequence. As Radiant's first Material Planner, you will build this function from the ground up and set the standard for how material planning operates at the company.

Responsibilities & Duties:

Planning Bill of Materials: Partner with Engineering to translate reactor design into a company-wide planning bill of materials.

MRP Standup: Work with the Mission Planning team to configure and launch Materials Resource Planning within our new ERP system.

Part Attribute Management: Own and maintain part attributes — lead times, order quantities, safety stock levels — to ensure accurate, actionable material plans.

Make/Buy Alignment: Coordinate with Production to keep make/buy decisions in MRP current with the production plan.

Shortage Reporting: Produce weekly Clear to Build reports identifying company-wide material shortages for Production.

Design Release Reporting: Produce weekly Design Release Needs reports, flagging designs required to meet procurement lead times.

Deliverables:

Company-wide planning bill of materials

Populated Materials Resource Plan

Maintained part attributes across the product line

Weekly Clear to Build reports showing production shortages

Weekly Design Release Needs reports based on procurement lead times

Required Qualifications & Skills:

3 – 10 years of relevant experience in material planning, supply chain management, or operations, preferably within manufacturing or technology sectors.

ERP/MRP system experience

Strong analytical and organizational skills with an ability to manage complex, evolving bills of materials.

Excellent cross-functional communication skills — this role sits at the intersection of Engineering, Mission Planning, and Production.

Comfort operating with ambiguity and building processes from scratch.

Desired Qualifications & Skills:

Experience working in a start-up, or other rapidly evolving industry is preferred

Additional Requirements:

• •Must be willing to work extended hours and weekends as necessary to
• accomplish our mission.

Must work 100% onsite at El Segundo HQ.

Benefits and Perks

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.