Head of Accounting, Corporate Controller

About the Role We are seeking an experienced and hands-on Head of Accounting, Corporate Controller to lead Muon Space’s accounting organization and build the scalable financial foundation required to support rapid growth across commercial and government programs. Reporting directly to the CFO, this role will own the company’s accounting strategy and execution, including financial close, external reporting, technical accounting, cost accounting, and internal controls. This is a highly visible leadership role partnering closely with cross-functional departments to ensure strong financial governance, disciplined program cost tracking, and audit-ready reporting in a complex, long-cycle industry. The ideal candidate combines deep technical accounting expertise with strong leadership, keen attention to detail and a systems mindset to scale processes, teams, and infrastructure as the company grows. This position is hybrid and requires working on-site in our San Jose, CA office three days per week. Responsibilities Accounting and Controller Leadership Lead the accounting organization, setting strategy, operating cadence, and performance expectations across the team. Own the end-to-end monthly, quarterly, and annual close, ensuring timely, accurate, and GAAP-compliant financial statements. Establish and maintain a strong controls environment, accounting policies, and procedures aligned with growth and audit readiness. Serve as the primary accounting leader to the CFO and executive team, providing clear insights on financial results, risks, and control matters. Lead external audit execution, including coordination with auditors and advisors, and ensure high-quality deliverables and on-time completion. Ensure timely and accurate tax and compliance reporting. Financial Reporting and Technical Accounting Own preparation and review of external financial reporting packages. Oversee technical accounting and complex transactions, including revenue recognition, capitalization policies, leases, equity compensation, and accrual methodologies. Ensure consistent application of accounting standards and provide guidance across the business on accounting implications of strategic decisions. Partner with tax advisors and internal stakeholders to support tax compliance and planning (income, sales/use, property, payroll-related filings as applicable). Operational Accounting and Scalable Infrastructure Oversee core accounting operations including AP, AR, payroll accounting, fixed assets, cash, accruals, and intercompany (as applicable). Drive improvements to transaction processing, close automation, and reconciliation discipline to improve speed, accuracy, and scalability. Lead ERP and finance systems strategy in partnership with Finance leadership, including implementation, optimization, and governance. Establish strong master data management and reporting standards to improve reliability of financial data across the company. Ownership and administration of the company's equity program. Cost Accounting, Inventory & Program Finance Enablement Build and own scalable cost accounting practices for a manufacturing and program-driven environment, including inventory/WIP, overhead allocation, and COGS integrity. Partner with Production, Supply Chain, and Program teams to ensure accurate and timely tracking of labor, materials, subcontractors, and program costs. Support accounting and compliance requirements for commercial and government contracts, including contract cost structure, billing support, and reporting readiness. Drive strong financial controls and audit trails across long-cycle programs to support customer, investor, and government reporting needs. Risk Management, Compliance & Cross-Functional Partnership Identify financial and operational risk areas and proactively strengthen controls, documentation, and review processes. Ensure compliance with applicable regulatory requirements and customer-driven reporting standards. Partner with FP&A to ensure c