Sr Staff Quantitative User Researcher

Why 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. And we’re doing this while never losing our 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. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms.

About this team and role:

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.

What you’ll do:

• 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.

What you’ll bring:

• 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 you’ll get:

• Generous performance-based bonus plans to all eligible employees - we share in our success as one team
• Rich medical, dental, and vision coverage
• Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
• Quarterly all-company wellness days where everyone takes a pause together
• 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)

About Mozilla

Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.

Commitment to diversity, equity, inclusion, and belonging

Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions.

We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation.

We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.

Group: C

Req ID: R3069