System Administrator - MES, Procurement, TestOps

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.

Radiant is seeking a Systems Administrator to own and administer core operational systems supporting Manufacturing Execution (MES), Quality Management, and Test Operations. In this role, you will ensure that the digital backbone of our manufacturing environment is reliable, scalable, compliant, and aligned with production needs. You will work cross-functionally with Manufacturing Engineering, Inventory, Quality, and Test Engineering, and you'll be a key technical contributor, ensuring our systems are secure, scalable, and reliable. You will have an opportunity to work in an interdisciplinary environment, with a high degree of ownership and drive, to advance milestones toward the commercialization of the first mass-produced nuclear reactor.

• Administer and maintain Radiant’s Manufacturing Execution System (MES), including configuration, user access, workflows, and integrations.

• Oversee the Purchasing module within ERP or related systems, ensuring alignment with supply chain processes.

• Support and maintain systems used for Test Operations, including data capture, traceability, and reporting.

• Configure workflows, user roles, permissions, and system logic to support production and testing processes.

• Monitor system health, resolve incidents, and perform root cause analysis on system-related disruptions.

• Coordinate system upgrades, patches, and version releases with minimal operational impact.

• Develop and maintain disaster recovery and data backup procedures for manufacturing-critical systems.

• Act as the bridge between business process owners and external system enhancements and integration efforts.

• Identify workflow inefficiencies and recommend system-based improvements.

• Develop system documentation, SOPs, and user training materials.

• Build access control, audit logs, and traceability required for regulated manufacturing.

• Ensure system configurations align with internal compliance requirements and export control constraints.

• Support audit compliance readiness and security - access documentation around manufacturing systems.

• Bachelor’s degree in Information Systems, Engineering, Computer Science, or related field.

• 3+ years of experience administering enterprise systems in a manufacturing environment.

• Direct experience with MES platforms (inclusive of early-stage systems, mid-market systems, and enterprise level systems).

• Experience supporting QMS issues and corrective actions, ERP purchasing, supply chain, or inventory modules.

• Strong understanding of manufacturing workflows, BOMs, routings, traceability, production control, kitting, and material movement.

• Ability to translate manufacturing processes into system configurations.

• Experience working cross-functionally with operations and engineering teams.

• Strong troubleshooting and root cause analysis skills.

• Experience with Microsoft O365 Gov, and other collaboration technologies.

• Experience supporting test operations or production test data systems.

• Familiarity with integrating MES and QMS systems.

• Experience in hardware, aerospace, nuclear, defense, or other regulated industries.

• Exposure to automation or PLC-connected environments.

• Working knowledge of scripting or automation tools for system administration.

• Experience supporting multi-site manufacturing operations.

• Familiarity working with both cloud and on prem infrastructure.

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

• Must work 100% onsite at El Segundo HQ.

• 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.

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.