Senior Accountant

About Panthalassa We are a renewable energy and ocean technology company committed to rapidly developing and deploying technologies that will ensure a sustainable future for Earth by unlocking the vast energy potential of its oceans. Our focus is on capturing civilizational levels of ultra-low-cost renewable energy for applications including computing and affordable renewable fuels delivered to shore. The company is a public benefit corporation headquartered in Portland, Oregon, and backed by leading venture capitalists, philanthropic investors, university endowments, and private investment offices. We operate as an idea meritocracy in which the best ideas change the company’s direction on a regular basis. About the Role Panthalassa continues to expand and strengthen our internal finance and accounting capabilities as the company scales from R&D toward manufacturing and deployment. We are looking for a hands-on accounting operator to own the accuracy, reliability, and responsiveness of our day-to-day accounting workflows. As a Senior Accountant you will be responsible for making sure vendors are onboarded correctly, invoices are entered and routed cleanly, payments move through the right process, and transactions are coded accurately in NetSuite. You will work across finance, engineering, manufacturing, procurement, vendors, and external accounting partners to understand the business context behind spend and translate that context into consistent accounting treatment. We are looking for someone who is technology-forward and excited to use AI and modern productivity tools to make accounting processes faster, cleaner, more auditable, and more scalable without sacrificing accuracy or judgment. . This is a high-ownership operating role that goes beyond AP processing, well suited for someone who likes clean data, clear processes, accurate books, and practical problem solving. Key Responsibilities Own and support core accounting operations, with a primary focus on accounts payable and procure-to-pay workflows. Manage vendor onboarding, vendor records, invoice intake, bill entry, approval routing, payment preparation, and payment follow-up. Help maintain clean, accurate financial data in NetSuite, including transaction coding, vendor records, reporting inputs, and process documentation. Ensure invoices, bills, expenses, and payments are coded accurately by department, project, vendor, spend category, and other relevant dimensions. Assist with spend tagging and reporting to improve visibility for budgeting, forecasting, and financial planning. Work with internal teams to understand the context behind purchases and translate that context into repeatable accounting and coding rules. Support timely and accurate month-end close, including reconciliations, journal entries, accruals, prepaid expenses, account analysis, and supporting schedules. Identify repetitive, manual, or error-prone accounting workflows and propose practical ways to improve them using automation, AI tools, better spreadsheet design, workflow software, or ERP configuration. Help build and document scalable accounting processes as Panthalassa brings more work in-house. Support payment operations, including vendor questions, missing payments, invoice discrepancies, payment timing, and related issue resolution. Identify errors, gaps, and inconsistencies in existing processes, then help implement practical fixes. Support audit, tax, compliance, and other finance requests as needed. Partner with finance and leadership, accounting leadership, and external accounting partners on technical accounting questions, controls, close tasks, and reporting needs. Maintain a high bar for accuracy, confidentiality, responsiveness, and ownership. Qualifications 5+ years of accounting, accounting operations, accounts payable, general ledger, or related finance operations experience. Strong accounting fundamentals and familiarity with U.S. GAAP. Experience with accounts payable, vendor onboa