Hiring: Principal Data Scientist, Ads Company: Reddit, Inc. Location: San Francisco, CA Job Posted Time: 2026-09-02 18:05:23 Target Skills & Keywords : Machine Learning, Rust About the job Required Skills: •Define the future of Ads Data Science: •Own the design and long-term evolution of our core Ads Data Science solutions and infrastructure, building for the next several years of continued scale, revenue growth, and relevance. •Strategic leadership & scientific roadmap: •Identify fundamental gaps and opportunities in our current systems (including platform, auction, targeting, and full-funnel relevance models). Lead the strategic design and scientific roadmap for new solutions to significantly improve Advertiser ROI, User experience, and Reddit revenue. •Drive end-to-end impact: •Take end-to-end ownership of complex problem domains such as full funnel acceleration, advertiser lifetime value (LTV), and developing advanced predictive and causal frameworks that power Reddit's strategic investments. •Establish scientific standards: •Define and codify best practices for large-scale statistical modeling, economic analysis, causal inference, offline model evaluation, and A/B experimentation to ensure scientific rigor and trust across the Ads data science and engineering teams. •Technical deep dive & authority: •Be the undisputed domain authority for data scientists, engineers, and product managers on complex problems involving large-scale behavioral data, foundational models for strategic insights, and the economics of marketplace dynamics. •Translate ambiguity into outcomes: •Influence the design and definition of core business and performance metrics, robust measurement methodologies, and collaborate deeply with cross-org XFNs to align on strategic goals and translate insights into tangible action. •Influence and uplevel the organization: •Lead technically minded peers and mentor senior data scientists, influencing technical and statistical direction across the entire product and engineering organization, Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don't miss this opportunity to join a forward-thinking team!