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FP&A Director

El Segundo, California, United States

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 failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. 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 utilizes modern software engineering to rapidly achieve safe, factory-built microreactors that leverage existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028.

Radiant is seeking a Director of FP&A to build and lead our financial planning and analysis function. We have strong finance fundamentals across reliable monthly close, clean audits, functioning AP, but we are looking for a leader to drive conversion of financial data into strategic insights and operational decisions. This role will bridge the gap between our accounting foundation and the investor-grade reporting required to support significant capital deployment, production ramp, and aggressive headcount growth.

This is a build role. You won't inherit mature systems or a defined playbook - you'll help create them. You'll need to navigate ambiguity while earning credibility with senior technical and operational leaders.

Responsibilities

Financial Reporting

  • Design and deliver monthly reporting packages that answer key operational questions and drive strategic insights
  • Build consistent and timely departmental P&L views with variance analysis and trend identification
  • Create program-level financial views that track prototype development, production units, and overhead 
  • Develop M/M and YTD trend analysis across all business units
  • Translate complex financial results into clear narratives for leadership and the Board
  • Support quarterly board materials and investor updates
  • Support regular reporting across treasury yields and cash management strategy 

Budgeting & Forecasting

  • Deliver monthly budget vs. actual variance reporting with actionable insights for internal and external stakeholders
  • Lead monthly rolling forecast process to update outlook based on current business trajectory
  • Support annual budget process including bottoms-up planning and scenario modeling
  • Create self-service dashboards that enable department heads to monitor their performance

Scenario Planning & Strategic Analysis

  • Conduct sensitivity analysis on key business drivers and help leadership understand trade-offs
  • Support strategic decision-making around hiring pace, capital deployment, and investment priorities
  • Evaluate make vs. buy decisions and provide financial perspective on build-out plans
  • Marry schedule progress with spend on long-lead procurement to assess schedule risks 

Unit Economics & KPI Development

  • Develop unit economics models for our microreactor products, tracking cost evolution from prototype through commercial production
  • Define and track key performance indicators across engineering, operations, and G&A functions
  • Build KPI dashboards with weekly, monthly, and quarterly reporting cadence
  • Partner with operations to track metrics that connect financial performance to operational execution

Cross-Functional Partnership

  • Partner with supply chain and operations on procurement planning and spend analysis
  • Work with engineering leads to understand program timelines and resource requirements
  • Collaborate with accounting to ensure data quality and alignment on reporting
  • Support HR on headcount planning and organizational design decisions

Required Qualifications

  • 8+ years finance experience, with 4+ years in FP&A or strategic finance roles
  • Demonstrated experience building FP&A infrastructure from scratch (not just inheriting mature systems)
  • Experience at a high-growth company navigating significant scale and complexity
  • Strong financial modeling skills; comfortable working with ambiguity and imperfect data
  • Track record of cross-functional partnership, particularly with operations and technical teams
  • Excellent communication skills with ability to translate financial concepts for non-finance audiences

Desired Qualifications

  • Hardware, manufacturing, or aerospace/defense industry background
  • SQL or BI tool proficiency (Power BI, Tableau, Looker)
  • Experience building or leading a team

What We're Looking For

  • Team player: willing to be an individual contributor initially while building toward leading a team
  • Builder mentality: creates from scratch rather than waiting for perfect systems
  • Strategic thinking: sees beyond the numbers to understand business implications
  • Operational mindset: understands that finance should enable faster, better decisions
  • Technical credibility: can earn trust with engineers and operations leaders
  • Comfortable with ambiguity: thrives in early-stage environments where playbooks don't exist

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.

Total Compensation and Benefits

Radiant's new hire compensation package includes base salary, substantial equity grants, and comprehensive benefits. Total compensation and level are determined through a holistic evaluation of your interview performance, experience, education, and qualifications. 

Benefits and Perks for Eligible Employees:

  • Stock: Substantial incentive stock plan for all full-time employees.
  • Medical: 100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
  • One Medical: Sponsored memberships for eligible employees and their dependents.
  • Vision: 100% premium coverage for top tier plan + 50% for dependents.
  • Dental: 100% premium coverage for top tier plan (including orthodontia) + 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.

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.

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