Accounting Manager / Controller

The Accounting Manager / Controller builds and leads TWT's accounting function, covering close, financial reporting, manufacturing cost accounting, internal controls, and audit readiness. You will bring bookkeeping in-house and build scalable processes, systems, and a team in a hands-on startup role.

The Accounting Manager / Controller builds and leads TWT's accounting function, covering close, financial reporting, manufacturing cost accounting, internal controls, and audit readiness. You will bring bookkeeping in-house and build scalable processes, systems, and a team in a hands-on startup role.

About TeraWatt Technology株式会社

TeraWatt Technology (TWT) is a deep-tech startup developing and manufacturing next-generation lithium-ion batteries. With proprietary cell technology and manufacturing capabilities, we drive innovation across mobility, energy, and industrial applications.

As we scale production sites and expand globally, we are building an accounting foundation to support manufacturing operations and reliable financial reporting.

TeraWatt Technology (TWT) is a deep-tech startup developing and manufacturing next-generation lithium-ion batteries. With proprietary cell technology and manufacturing capabilities, we drive innovation across mobility, energy, and industrial applications.

As we scale production sites and expand globally, we are building an accounting foundation to support manufacturing operations and reliable financial reporting.

Responsibilities

• Own the monthly, quarterly, and annual close, including the general ledger, reconciliations, and financial statements
• Work with auditors and external advisors to select appropriate accounting standards and establish financial statements and a reporting framework under those standards; support future IFRS/US GAAP readiness as required
• Design and operate cost accounting for cell manufacturing, including standard costing, inventory/WIP valuation, and variance analysis
• Partner with Manufacturing and Supply Chain to ensure manufacturing and inventory data, including BOM inputs, are accurately reflected in cost accounting
• Bring bookkeeping in-house from the external tax accountant and establish scalable accounting processes
• Oversee AP, AR, expense reimbursement, fixed assets, and payroll accounting

Establish and document internal controls over financial reporting

• Own day-to-day external audit execution, including audit materials, request coordination, and follow-up on findings
• Coordinate tax and statutory filings with external advisors and ensure compliant accounting and reporting for government grants and subsidies
• Select, implement, and administer accounting systems and related tools
• Hire and develop the accounting team as the company grows
• Provide accurate, timely actuals to support business planning and decision-making
• Own the monthly, quarterly, and annual close, including the general ledger, reconciliations, and financial statements
• Work with auditors and external advisors to select appropriate accounting standards and establish financial statements and a reporting framework under those standards; support future IFRS/US GAAP readiness as required
• Design and operate cost accounting for cell manufacturing, including standard costing, inventory/WIP valuation, and variance analysis
• Partner with Manufacturing and Supply Chain to ensure manufacturing and inventory data, including BOM inputs, are accurately reflected in cost accounting
• Bring bookkeeping in-house from the external tax accountant and establish scalable accounting processes
• Oversee AP, AR, expense reimbursement, fixed assets, and payroll accounting

Establish and document internal controls over financial reporting

• Own day-to-day external audit execution, including audit materials, request coordination, and follow-up on findings
• Coordinate tax and statutory filings with external advisors and ensure compliant accounting and reporting for government grants and subsidies
• Select, implement, and administer accounting systems and related tools
• Hire and develop the accounting team as the company grows
• Provide accurate, timely actuals to support business planning and decision-making

Requirements

• Can move seamlessly between strategy and hands-on execution depending on the situation
• Thrives in a fast-paced, growing startup environment

Builds trust and alignment across teams and stakeholders

• Values on-the-ground understanding and can drive improvements end-to-end
• Shows curiosity and strong interest in both business and technical domains
• Open, flat, and highly collaborative environment
• High degree of ownership and autonomy

Fast decision-making and flexibility

• Strong culture of building scalable systems and operational excellence
• Team members motivated by solving social challenges through advanced technology

Benefits

• 要相談（スキルに応じてご相談の上決定します）

勤務地

神奈川 横浜 （Japan, Kanagawa Yokohama）