Staff Data Scientist, Ads - Mozilla

About Mozilla

Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security, and more—never losing focus on our core mission to make the internet better for people.

The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. Along with thousands of volunteer contributors and collaborators worldwide, Mozillians design, build, and distribute open-source software that enables people to enjoy the internet on their terms.

About the Team and Role

The Monetization Data Science team partners closely with Product, Engineering, Sales, Finance, and senior leadership to understand and grow Mozilla’s advertising business while protecting the user privacy experience that makes Firefox unique.

Mozilla’s Ads business is growing quickly, with new products, markets, and sales offerings creating significant opportunities for Data Science to shape how the business evolves. We’re looking for a Staff Data Scientist who can serve as a trusted data partner to the Ads organization—identifying key questions, building measurement and analytical approaches, and helping teams make sound decisions in a fast-moving, ambiguous environment.

What You’ll Do

• Serve as a lead Data Science partner for Mozilla’s Ads business, collaborating across Product, Engineering, Sales, Finance, and leadership to prioritize high-impact opportunities.
• Own complex analytical problems end-to-end, from framing the business question to validating results, communicating recommendations, and driving follow-through.
• Develop measurement frameworks for new and evolving advertising products, including success metrics, experimentation, instrumentation, and reporting.
• Analyze advertising revenue and performance to identify key drivers, evaluate opportunities and trade-offs, and inform product and business decisions.
• Translate complex findings, assumptions, and uncertainty into clear recommendations for both technical partners and senior executives.

What You’ll Bring

• 8+ years of experience in data science, analytics, or applied quantitative roles, with demonstrated ownership of complex, business-critical analytical work.
• Experience with digital advertising or related monetization models, understanding how product, user, advertiser, and revenue outcomes interact.
• Strong technical foundation in Python and SQL, with experience applying statistical, experimental, forecasting, and analytical methods to real-world business problems.
• Demonstrated ability to independently frame ambiguous problems, identify what matters, and drive work from open-ended questions to clear recommendations.
• Excellent analytical judgment—balancing rigor with pragmatism, pressure-testing results, and communicating uncertainty appropriately.
• Proven ability to build trusted relationships and communicate complex findings across cross-functional audiences.
• Commitment to Mozilla's values: welcoming differences, being relationship-minded, practicing responsible participation, and having grit.

What You’ll Get

• Generous performance-based bonus plans.
• Rich medical, dental, and vision coverage.
• Generous retirement contributions with 100% immediate vesting.
• Quarterly all-company wellness days and quarterly well-being stipend.
• Country-specific holidays plus a day off for your birthday.
• One-time home office stipend.
• Annual professional development budget.
• Considerable paid parental leave.
• Employee referral bonus program.