FP&A Manager

Deep Fission, Inc

1d

About The Position

The FP&A Manager will be responsible for day-to-day ownership of Deep Fission’s corporate financial planning and analysis activities, including maintaining the FP&A model, integrating monthly accounting actuals, supporting budgeting and forecasting, and strengthening financial planning processes as the company scales. This role represents the first dedicated internal FP&A hire and will play a key role in building scalable financial planning processes. Over time, this role may grow into leading the FP&A function as the company scales. Reporting to the Sr. Director of Strategic Finance & FP&A, this is a hands-on individual contributor role for someone who thrives in a fast-paced, evolving environment and enjoys rolling up their sleeves to build and maintain durable financial infrastructure. The ideal candidate brings strong accounting foundations, a high degree of ownership, and comfort operating amid changing priorities typical of a growing energy technology company. This role will play a critical part in improving financial visibility, discipline, and planning rigor as Deep Fission progresses through R&D and toward commercialization.

Requirements

• Bachelor’s degree in Finance, Accounting, Economics, or a related field
• 5-10 years of experience in FP&A, corporate finance, or related roles
• Strong foundation in accounting principles, including experience working with accruals, cash flow, and month-end close processes
• Demonstrated experience building, improving, and maintaining complex financial models with a high degree of accuracy and independence
• Advanced Excel and financial modeling skills
• Ability to operate effectively in a fast-paced, changing environment with evolving priorities
• Strong attention to detail, ownership mindset, and commitment to accuracy
• Clear communicator with the ability to work cross-functionally with finance and non-finance stakeholders

Nice To Haves

• Background in accounting with subsequent transition into FP&A, or significant experience working closely with accounting teams
• Experience in energy, infrastructure, manufacturing, or other capital-intensive industries
• Experience building, improving, or scaling FP&A processes in a startup or growth-stage environment
• Familiarity with enterprise planning or forecasting software, including implementation or scaling experience
• CPA, CFA, or MBA a plus, but not required

Responsibilities

• Own and maintain the corporate FP&A financial model, including budgets, forecasts, cash flow, runway analysis, and multi-period planning
• Integrate monthly accounting actuals into the FP&A model, ensuring accurate reconciliation between accrual-based financials and cash-based planning
• Support monthly, quarterly, and annual budgeting and forecasting processes, including variance analysis and explanation of key drivers
• Maintain and update headcount, compensation, and operating expense assumptions in coordination with functional leaders
• Implement assumption changes, scenario analyses, and model enhancements as business priorities, project plans, and timelines evolve
• Prepare and support internal financial reporting materials for executive leadership, including budget vs. actual and forecast updates
• Partner cross-functionally with accounting, operations, engineering, and other teams to improve financial visibility and support informed decision-making
• Help build, refine, and scale FP&A processes, reporting frameworks, and planning tools appropriate for a growing, capital-intensive organization
• Support evaluation, implementation, or scaling of enterprise-level planning or forecasting systems, as appropriate
• Perform ad hoc financial analyses and support special projects as organizational priorities evolve

Benefits

• We do not discriminate on the basis of race, color, creed, religion, ancestry, age, sex, marital status, national origin, disability, veteran status, or any other characteristic protected by applicable law.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level