Senior Tax Specialist; Direct & Indirect Taxes, Multi Jurisdiction

At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online.

Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive, and Proton Pass. These tools empower individuals and organizations to take control of their personal data, break away from Big Tech’s invasive practices, and defeat censorship. Our work impacts hundreds of millions of lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive information.

In some cases, Proton’s services have even been instrumental in saving lives by enabling secure and private communications in high-risk situations.

Proton today supports over 100 million user accounts with a growing team of over 500 people from over 50 different countries, from the world's top companies and universities. We value intelligence, learning potential, and ambition in our hiring process. Adaptability is key as we navigate uncharted territories and redefine how business is conducted online. We believe smaller teams of exceptional talent will always prevail over larger teams with lower talent density.

Proton has become profitable and reached scale without relying upon VC funding, largely due to superior talent that allows us to do things faster, more creatively, and more efficiently.

We have a global mindset and big ambitions but remain a start-up  value empowerment and flexibility and keep our structure flat to keep moving fast and avoid unnecessary politics. Tired of blending into the crowd? Join us and do work you can truly be proud of.

Within our Finance function, we are seeking a Senior Tax Specialist to architect and execute a best-in‑class global tax framework that keeps pace with our SaaS scale‑up’s rapid international expansion. Reporting to the Head of Finance, you will be a strategic linchpin in building a tax function that simultaneously safeguards compliance and fuels growth. Your mission spans the full tax spectrum (direct, indirect, payroll, and equity compensation) across multiple jurisdictions.

You will steer tax critical initiatives such as transfer pricing design, VAT/sales tax automation, payroll tax control, and stock option reporting, while embedding robust risk management processes and tax tech solutions. Acting as a trusted advisor to leadership and cross‑functional teams, you will anticipate regulatory change, lead tax audits, and translate complex rules into pragmatic guidance that accelerates market entry and product launches.

Ultimately, this role is pivotal in ensuring that our global tax posture not only meets ever‑evolving legal requirements but also optimises cash tax outcomes and supports sustainable, hyper growth scale operations.

• Own end‑to‑end VAT/GST/sales‑tax registrations, return prep and reconciliations across worldwide locations.
• Monitor nexus thresholds, advising the business on exposure.
• Maintain and validate multi‑jurisdiction VAT/GST/sales‑tax engine settings for B2C and B2B transactions in our subscription management and tax information tools.

• Manage global corporate‑income‑tax compliance, provisioning and filings for HQ and subsidiaries.
• Lead transfer‑pricing documentation, inter‑company charge‑outs and permanent‑establishment risk reviews.
• Oversee withholding‑tax and treaty‑relief processes on cross‑border SaaS revenue streams
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• Standardise processes and controls across jurisdictions, document standard Operating Procedures for scalability.
• Coordinate global tax calendars, ensure on‑time filings, payments and statutory disclosures.
• Prepare quarterly and annual tax provisions (IFRS & Swiss CO), liaising with finance and external auditors.
• Lead or support tax‑authority audits, crafting technical memoranda and data packs.
• Serve as the tax owner for…