Senior Accounting Manager - Mozilla

About Mozilla.org

Mozilla is a mission-driven portfolio of companies and organizations working together to shape an internet that serves people and the public good.

Currently, this portfolio includes the Mozilla Foundation, Mozilla Corporation, MZLA, Mozilla Ventures, Mozilla.ai, and Mozilla Data Collective.

About the Role

The Senior Accounting Manager is a key member of the Finance team responsible for the integrity, accuracy, and scalability of accounting and financial operations across Mozilla.org and related subsidiaries. Reporting to the Head of Finance, this role owns multi-entity accounting, financial close and reporting, treasury, tax coordination, audit management, and financial controls across one non-profit and two for-profit organizations.

Key Responsibilities

Accounting Operations, Close & Financial Reporting

• Own daily accounting in the general ledger for three managed entities, including journal entries, expenses, accruals, pre-paids, fixed assets, inter-company transactions, and revenues.
• Manage monthly, quarterly, and annual close processes across entities.
• Maintain integrity of the general ledger and shared chart of accounts.
• Partner with HR to ensure payroll and benefits payment accuracy.
• Prepare financial statements, management reporting, and supporting schedules.
• Own inter-company accounting, reconciliations, and elimination entries.
• Ensure appropriate accounting treatment for both for-profit and nonprofit entities (grants, functional expenses, investments, etc.).
• Support annual budgeting, forecasting, and financial reporting.

Treasury, Tax & Compliance

• Oversee cash management, cash flow forecasting, banking relationships, account administration, and payment controls.
• Coordinate federal, state, and local tax compliance (corporate income tax, Form 990, etc.) with external tax advisors.
• Maintain visibility into filing requirements, deadlines, and compliance exposures.
• Ensure appropriate legal-entity separation and financial documentation.

Audit, Controls & Financial Operations

• Serve as key point of contact for external auditors and tax advisors.
• Coordinate audit planning, schedules, information requests, and audit resolution.
• Maintain and strengthen internal controls, accounting policies, and procedures.
• Oversee accounting platforms for AP, AR, payroll, and benefits.
• Identify and implement opportunities to improve, automate, and scale financial processes.

Required Qualifications

• 7+ years of progressively responsible accounting experience, including general ledger, close, and financial reporting for non-profit and for-profit organizations.
• Strong knowledge of U.S. GAAP and complex accounting processes.
• Experience supporting multiple legal entities or complex organizational structures.
• Experience managing treasury, cash flow, tax compliance, annual audits, and internal controls.
• Strong analytical, systems, and spreadsheet skills.
• Excellent organizational skills with the ability to manage multiple priorities.
• Ability to work independently and collaboratively.

Preferred Qualifications

• CPA or equivalent accounting qualification.
• Experience working across for-profit and nonprofit organizations.
• Experience with nonprofit accounting (grants, functional expense reporting, Form 990).
• Experience with inter-company accounting and consolidated financial reporting.
• Multi-state tax compliance and international entity experience.