FP&A Director

Radiant•El Segundo, CA

3h•Onsite

About The Position

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.

Requirements

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
Must be willing to work extended hours and weekends as necessary to accomplish our mission.
Must work 100% onsite at El Segundo HQ.

Nice To Haves

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

Responsibilities

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
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
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
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
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

Benefits

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.