Controller

What MatX is Building MatX's mission is to make the world’s best AI models run as efficiently as allowed by physics, bringing the world years ahead in AI quality and availability. Your Place Here MatX is seeking a dedicated and experienced Corporate Controller to lead our accounting function and ensure the integrity, accuracy, and scalability of our financial operations as we grow. This role will serve as the guardian of financial data integrity — going beyond compliance to drive transparency, support executive decision-making, and deliver high-quality insights to internal leadership, investors, and the Board of Directors. As a key member of the Finance team, you will oversee accounting, establish in-house processes and infrastructure, strengthen governance, and ensure financial rigor across a fast-moving, engineering-driven organization. What This Role Owns Full ownership of the monthly close , GAAP financials, and accounting governance Oversight and management of accounting function (bringing the function in-house) Accounting for R&D, tape-out costs, manufacturing, inventory, and NREs Payroll, treasury, cash management, and bank reconciliations Board and investor-ready financial reporting in partnership with the Finance Lead ERP readiness and transition planning as MatX outgrows QuickBooks Online Accounting, Close & Governance Own and oversee all core accounting functions, including Accounts Payable, Accounts Receivable, General Ledger, Treasury, Fixed Assets, and Project Accounting Lead a timely and accurate monthly, quarterly, and annual close, ensuring GAAP-compliant financial statements Manage and review work performed by outsourced accounting providers, ensuring quality, timeliness, and adherence to internal standards Design, implement, and maintain accounting policies, procedures, and internal controls appropriate for a scaling semiconductor startup Coordinate payroll processing in partnership with a third-party payroll provider, including review of payroll entries and reconciliations Serve as primary accounting owner for audits, reviews, and investor diligence requests Own tax compliance and reporting, including income tax provision, federal/state/local compliance, sales & use tax, and franchise tax filings across applicable jurisdictions Identify and document eligibility for R&D tax credits in partnership with external advisors, to ensure the company is capturing available credits, particularly given qualifying wafer, tape-out, and design activity Semiconductor-Specific Accounting & Cost Management Partner with Engineering and Operations to ensure accurate accounting for R&D spend, wafer fabrication, tape-out costs, mask sets, non-recurring engineering costs, multi-project wafer runs, packaging, testing, and inventory Track and account for tape-out milestones, including capitalization vs. expense treatment in accordance with GAAP Support program-level cost tracking across silicon development phases (pre-tape-out, tape-out, bring-up, production) Ensure appropriate treatment of long-lead manufacturing commitments, prepaid expenses, accruals, and supplier deposits Own inventory accounting end-to-end, including standard costing methodology, excess & obsolete inventory reserves, and cycle count / physical inventory processes for wafers, die, and packaged parts Support trade compliance and export control accounting including duty, tariff, and customs valuation treatment, and maintain financial controls aligned with export classifications (EAR/ITAR) for cross-border shipments of wafers, die, and finished goods Manage foreign currency exposure arising from payments with foreign fabs, OSAT (assembly & test), and mask houses, including exposure tracking and coordination with the Finance Lead on any hedging strategy (Note: This role does not manage the engineering tape-out process, but ensures financial visibility, controls, and accurate accounting of it.) Financial Reporting & Board Support Partner with the FinOps lead to res…