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Mozilla Logo Mozilla · Research and Development

Senior Staff Quantitative User Researcher

United States; Canada, Remote · Job Posted March 21, 2026
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Job Description

The Firefox User Research team champions human-centered exploration of complex problems, using evidence, data, and insight to drive decision-making. We use quantitative and qualitative research to understand business needs and uncover user insights that inform product and design strategy. As a Senior Staff Quantitative User Researcher, you’ll lead both strategic and tactical quantitative studies in close partnership with product managers, designers, engineers, marketers, data scientists, and fellow researchers. You’ll apply quantitative methods to scientifically understand users’ experiences, needs, motivations, and behaviors at scale, translating those findings into clear, actionable insights that shape roadmaps and strategies.

Job Responsibility

  • Own strategic quantitative research initiatives from scoping business needs and designing surveys to synthesizing data and communicating actionable recommendations to influence product decisions
  • Utilize a variety of research methods to embed quantitative insights into the end-to-end product development lifecycle (e.g., discovery opportunity sizing, prioritization, concept testing, tracking and measurement after launch)
  • Partner cross-functionally at a strategic level with product, design, engineering, data science, and marketing to develop and own a research roadmap, identify high-impact research opportunities, and align insights to business priorities
  • Analyze and translate complex data sources (e.g., surveys, behavioral data, and market intelligence) to build cohesive, evidence-based perspectives that guide product decisions
  • Champion user-centered decision-making by embedding research into product strategy, advocating for user needs, and influencing leaders across functions
  • Elevate the quantitative practice by mentoring peers, refining methods and tools, and scaling approaches that increase the visibility and impact of user insights across Firefox

Requirements

  • 8+ years of experience in user research, product research, or an applied research setting or similar, with a strong focus on quantitative research
  • Extensive experience leading survey research across multiple phases of the product development lifecycle, using quantitative insights to influence product decisions
  • Deep expertise in empirical survey methods (e.g., planning, sampling, weighting, statistical analysis) and applications (e.g., discovery, product needs, prioritization, concept testing, panel surveys, intercept surveys, write-in analysis, post-release measurement)
  • Highly proficient in R for statistical programming and analyzing survey data
  • Extensive hands-on experience manipulating behavioral data using SQL and integrating into survey methods to tell a cohesive user-focused story
  • Demonstrated ability to craft compelling narratives using quantitative data and visualizations
  • Demonstrated success operating in fast-paced, agile environments, adapting to shifting priorities while maintaining research impact
  • Strong judgment in balancing research depth and speed, delivering insights that are both actionable and impactful for product and business decisions
  • Hands-on experience with mixed methods and qualitative research, able to collaborate with qualitative researchers to enable mixed methods research designs and roadmaps
  • Collaborative and influential communicator, skilled at building partnerships with cross-functional teams and driving alignment through evidence-based insights
  • Experienced in supporting iterative, user-centered product development, ensuring research continuously informs design and strategy
  • Commitment to our values: Welcoming differences
  • Being relationship-minded
  • Practicing responsible participation
  • Having grit

What we offer

  • Generous performance-based bonus plans to all eligible employees
  • Rich medical, dental, and vision coverage
  • Generous retirement contributions with 100% immediate vesting
  • Quarterly all-company wellness days
  • Country specific holidays plus a day off for your birthday
  • One-time home office stipend
  • Annual professional development budget
  • Quarterly well-being stipend
  • Considerable paid parental leave
  • Employee referral bonus program
  • Other benefits (life/AD&D, disability, EAP, etc. - varies by country)
  • Flexible work environment
  • Industry-leading paid parental leave (up to 26 weeks of fully paid leave for childbearing parents and up to 12 weeks for non-childbearing parents)
  • Reimbursement for professional development (up to $3,000/year)
  • A work setup including the latest hardware and software of your choice
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