Corporate FP&A Manager

Consequential Work. Dedicated People. About Onebrief Onebrief builds collaboration and AI-powered workflow software for military planning and operational coordination. Military planning is complex by nature, requiring teams to coordinate information, people, and decisions across systems and locations. Onebrief brings planning, collaboration, simulation, and AI into one connected environment, helping teams test strategies, adapt to changing conditions, and make decisions with greater clarity when the stakes are real. We are a distributed team of builders from military, operational, and technology backgrounds who care deeply about improving how important work gets done. Some team members work remotely, while others work directly alongside customers in operational environments around the world. Founded in 2019, Onebrief is backed by leading investors including General Catalyst, Battery Ventures, Insight Partners, Sapphire Ventures, and Human Capital. Valued at more than $2 billion, we continue to invest in product innovation, AI capabilities, and team growth. Why This Role Exists We are seeking a strategic, hands on Corporate FP&A Manager to join our team and report to our FP&A leader. This high-impact role owns regular budgeting and forecasting cycles, select enterprise-wide expense forecasts, and partners strongly with finance leaders on the Long Range Plan and burn and runway projections. You will manage and develop a team of FP&A Business Partners, enabling strong departmental partnership while driving the company-wide process, cadence and elevating the quality bar. As Planful Super Admin, you will own system administration and lead initiatives to streamline and automate forecasting while ensuring reliable execution of current processes. You will partner with finance and executive leadership to provide accurate, actionable visibility and scale the function as Onebrief grows. We are looking for someone to bring structure to ambiguity, communicate clearly, and take full ownership from planning through execution. This role will improve and automate manual processes while ensuring they continue to run reliably until the new solution is in place. We are looking for someone curious and collaborative, that can operate effectively as a player-coach in a scaling organization.

Own Company-Wide Expense Budgeting and Forecasting: Own the end-to-end planning process, coordinating FP&A Business Partners' departmental inputs into a cohesive, accurate company plan. Own select enterprise-wide expense forecasts (eg. benefits). Ensure Financial Data Integrity: Partner with Accounting to establish controls and validations across the systems (ERP/HR/RevRec/Planful) to ensure consistent and reliable data. Own Forecast Performance and Management Reporting: Lead monthly management reporting, including forecast and budget to actual variance analysis, forecast accuracy, key business drivers, risks, and opportunities, and develop executive ready materials that translate financial performance into clear insights and recommended actions. Drive Process Automation & Streamlining: Lead high-impact projects to streamline and automate expense forecasting, improving accuracy, speed, and scalability across planning tools, integrations, visualization and financial infrastructure. Maintain and Evolve the Long Range Plan: Partner with stakeholders to continuously develop and enhance Onebrief's existing 3-statement Long Range Plan as strategy, growth assumptions, and scenario-planning needs evolve. Own Balance Sheet and Short-Term Cash Flow Forecasting: Forecast the balance sheet, cash flow, burn, and runway to provide leadership with clear visibility into the company's financial trajectory. Administer Planful and Financial Data Hierarchies: Serve as Planful Super Admin, owning system configuration, security, access, workflows, templates, and troubleshooting while maintaining scalable, consistent hierarchies across the chart of accounts,