Senior Mission Planner, Supply Chain

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 seeking an experienced Senior Master Scheduler to own risk assessment and master scheduling across the company.

This is a key operations role. You will manage master project schedules that guide Radiant’s commitment and constraint management, and you will build and maintain long-term schedules grounded in sales forecasts and current capacity. You will interface with every level of leadership and act as the central link between Sales, Engineering, Procurement, Production, and Facilities. You will assess schedule risk across individual programs in the context of the full program, then make sure leadership sees it clearly and early.

Responsibilities & Duties Operational Planning and Master Planning Executive Communication:
Present schedule status, risks, and tradeoffs to VPs and the C-suite.

Root Cause Analysis:
Investigate and understand the root cause of schedule impacts. Assess risk across individual programs in light of the full program.

Program & Product Management:
Assess schedule health in light of the full program and product lifecycle. Guide the schedule differently depending on the phase of the program and product.

New Product Integration:
Work with ambiguous product and program definitions and coordinate across Engineering, Supply Chain, Manufacturing, and Sales. Bring an organized approach to complex data.

Schedule Creation & Management:
Create and analyze schedules in Microsoft Project and Smartsheet. Combine schedules to assess critical path, dependencies, slack, and capacity. Drive detailed schedules for key activities.

Deliverables Company-wide master schedule tied to sales forecasts and current capacity

Integrated schedules showing critical path, dependencies, slack, and capacity

Detailed schedules for key activities

Schedule risk assessments and root cause analyses for schedule impacts

Executive-level schedule updates for VP and C-suite audiences

Required

Qualifications & Skills:

(not in your content, so these are placeholders to confirm)[5-20] years of relevant experience in master scheduling, program planning, or operations, preferably within manufacturing or technology sectors

Proficiency in Microsoft Project and Smartsheet Strong analytical and organizational skills, with the ability to manage complex, interdependent schedules

Excellent cross-functional and executive communication skills

Comfort operating with ambiguity and building processes from scratch

Desired

Qualifications & Skills:

Experience in a start-up or other rapidly evolving industry

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…