Senior Manager, Accounting & Finance - Mozilla

About Thunderbird

Thunderbird is one of the world’s most trusted open-source email applications, empowering more than 20 million people globally. At Thunderbird, we build privacy-respecting communication and productivity tools that help people manage their digital lives while staying in control of their data.

We are open source by design. Our products are developed transparently and in collaboration with a global community of contributors, and that same spirit shapes how we work: collaboratively, inclusively, and with a shared commitment to putting users first.

We are a small but growing company of 70+ people distributed across seven countries. Thunderbird Technologies Corporation is the nonprofit-owned company behind Thunderbird email and a growing portfolio of products. While part of the Mozilla family, Thunderbird is a separate entity from Mozilla Corporation and Mozilla Foundation with its own compensation programs, benefits, and employment policies.

The Opportunity

We are looking for a Senior Manager, Accounting & Finance to serve as Thunderbird’s most senior finance professional. The right person will bring a strong accounting or controllership foundation and the breadth to lead financial planning and analysis, finance operations, and organization-level decision support.

Reporting to the Chief Operating Officer, you will directly manage our Senior Staff Accountant and Senior FP&A Analyst. This is a hands-on functional leadership role for someone who can provide experienced financial judgment, develop an established team, and remain close to the details while helping build the systems, controls, reporting, and finance practices the organization needs for its next stage of growth.

What You’ll Do

• Lead Thunderbird’s finance function, with overall responsibility for accounting, financial planning and analysis, tax, treasury, and finance operations.
• Manage and develop Thunderbird’s finance team, establishing clear priorities, responsibilities, review practices, and accountability.
• Oversee monthly and annual close, financial reporting, reconciliations, accounting policies, and internal controls.
• Oversee accounting and revenue recognition across donations, subscriptions, enterprise arrangements, partnerships, and other revenue streams.
• Lead annual budgeting, forecasting, longer-range financial planning, and scenario analysis.
• Develop clear management reporting and visualizations that highlight important trends, risks, tradeoffs, and decisions.
• Oversee tax, audit, indirect tax, VAT/GST, corporate filings, and related work with external advisers.
• Evaluate the financial, tax, accounting, and operational implications of entering new jurisdictions or establishing additional entities.
• Work with Enterprise Partnerships and Legal to establish financial reporting, reconciliation, and control processes for partner-led commercial arrangements.
• Oversee financial reporting to Thunderbird’s parent organization and affiliated Mozilla organizations.
• Own financial oversight of payroll across multiple providers in partnership with the People team.
• Document and strengthen finance systems and workflows, including accounting, expense management, payment-platform reconciliation, documentation, and automation.
• Oversee cash-flow planning, treasury, banking, and investment activities, working closely with the Senior FP&A Analyst.
• Serve as a trusted finance adviser to organizational leaders, translating complex financial information into clear recommendations.

What You Bring

• 15+ years of relevant professional experience, including progressively responsible roles spanning accounting, financial planning and analysis, and finance operations.
• Significant accounting or controllership experience, including responsibility for U.S. GAAP financial reporting, close processes, internal controls, revenue recognition, and complex accounting judgments.
• 5+ years of people management experience in a finance or accounting environment, including coaching, feedback, prioritization, performance support, career development, and team development.
• Demonstrated ability to improve budgeting, forecasting, management reporting, and financial data visualization and translate complex information into clear insights and recommendations for non-finance leaders.
• Substantive experience with subscription, SaaS, digital-product, enterprise, or comparable technology-based revenue models.
• Experience supporting partner-led commercial arrangements (e.g., reseller, licensing, wholesale, or revenue-sharing models), including evaluating financial terms and developing related reporting, controls, and revenue-recognition processes.
• Working knowledge of merchant-of-record arrangements, payment platforms, indirect tax, and international VAT/GST requirements.
• Experience supporting an internationally distributed organization and coordinating financial obligations across multiple jurisdictions.
• Proven ability to oversee tax, audit, and external finance requirements while effectively managing outside advisers.
• Experience providing oversight and review of cash management, treasury, banking, and organizational investment activities.
• A track record of strengthening financial systems, workflows, documentation, and controls.
• Strong judgment and comfort moving between people leadership, detailed financial review, practical hands-on problem-solving, and organization-level decision support.
• Excellent communication and cross-functional collaboration skills.

Bonus Points For

• Experience working within a subsidiary, portfolio, federated, or similarly affiliated organizational structure, including reporting to a parent organization or shareholder.
• Prior work supporting the establishment of a new legal entity or expansion into a new jurisdiction.
• Familiarity with Intacct, Ramp, or comparable finance and expense-management systems.
• Experience in a mission-driven, open-source, nonprofit-affiliated, or values-oriented organization.

Work Environment & Travel

This is a full-time, fully remote position. This role requires regular working-hour overlap with North American time zones (Eastern or Central time zones preferred; candidates elsewhere in the US must maintain substantial overlap). Flexibility for periodic meetings with European colleagues and advisers is expected. Company-wide gatherings and team workweeks may involve periodic domestic or international travel.

Compensation & Benefits

• Base Salary: $165,000 - $190,000 USD
• Work & Career: Fully remote work & schedule flexibility, company-provided laptop, annual bonus program, monthly remote work stipend, annual professional development stipend, Coursera access, company all-hands and team gatherings.
• Rest & Play: 24 days PTO per year (prorated), birthday off, year-end company shutdown, 9 wellbeing days, public holidays, and quarterly wellbeing stipend.
• Health & Family: 401(k) contributions, comprehensive health, dental, and vision insurance, disability and life insurance, employee assistance program, paid parental leave, and paid sick days.

Applicants must reside in the United States and have permanent work authorization. Visa sponsorship is not provided.