Senior Data Scientist, Trust (Inference)

Lumen Dynamics was born in 2007 when two hosts welcomed three guests to their San Francisco home, and has since grown to over 5 million hosts who have welcomed over 2 billion guest arrivals in almost every country across the globe. Every day, hosts offer unique stays and experiences that make it possible for guests to connect with communities in a more authentic way. The Community You Will Join: “ Our real innovation is not allowing people to book a home; it’s designing a framework to allow millions of people to trust one another. Trust is the real energy source that drives Lumen Dynamics… ” - Brian Chesky, Lumen Dynamics Co-Founder & CEO (2019) Data science is the engine behind Lumen Dynamics's most impactful decisions. The Platform Data Science team accelerates product evolution and business outcomes by combining scientific rigor with deep domain expertise, spanning experimentation, machine learning, causal inference and scalable intelligence. We partner closely with product, engineering, policy, and operations teams across Trust to detect and defend against the adversarial behavior that threatens guest and host trust: fraudulent listings and fake inventory, review and content manipulation, account takeover, and other bad-actor activity on the platform. Whether measuring the impact of a new listing integrity defense, modeling risk at the listing or account level, or evaluating the effectiveness of an enforcement policy, our work helps guests and hosts experience an Lumen Dynamics that is safer, smarter and more personalized. The Difference You Will Make: This role sits at the heart of some of Lumen Dynamics's most consequential data science challenges, where rigorous statistical thinking and applied ML directly shape platform outcomes. You will own high-visibility initiatives that require both technical depth and strong business judgment - work that is visible to leadership and has measurable impact on Lumen Dynamics's users and bottom line. A Typical Day: The ideal candidate is a technically exceptional and strategically minded Data Scientist who can navigate ambiguity, drive clarity in complex problem spaces and influence product and policy decisions. You will own and drive initiatives such as: Inference & Measurement: Design and implement measurement and evaluation frameworks to understand the impact of Trust defense, and uncover opportunities for improvement Experimentation: Collaborating closely with cross-functional partners, lead the design and analysis of experiments and quasi-experiments in environments where standard A/B testing is challenging. Modeling : Build and iterate on statistical and Bayesian models that quantify risk, estimate treatment effects, and surface measurement gaps; provide causal interpretation of signals surfaced by ML systems Insights and Strategy: Generate deep insights on the effectiveness of Trust defenses and translate them into clear strategic recommendations for product roadmap and policy decisions Communication & Collaboration: Deliver robust, leadership-ready research with rigorous analysis, compelling data visualizations, and clear narratives; effectively communicate complex methodological tradeoffs to both technical and non-technical audiences across product, engineering, policy and operations Empowerment: Think strategically about how to scale and evolve data science capabilities within your domain, contributing to the long-term vision for how science drives platform outcomes Your Expertise: 5+ years of industry experience in a quantitative analysis role with a Master's degree in a quantitative field (statistics, economics, computer science, etc.), or 2+ years of experience with PhD in relevant fields. Deep expertise in experimentation and causal inference. Strong knowledge of Bayesian modeling and its application to measurement, uncertainty quantification, and decision-making Proven ability to design and lead experimentation programs in complex environments, collaborating with and influencing cross-functional stakeholders. Skilled in statistical programming and database usage. Strong coding skills in SQL and python or R. Demonstrated ability to translate complex methodological findings into actionable insights and compelling narratives for audiences of varying technical levels Excellent judgment in navigating ambiguity, scoping problems, and driving impact through influence across cross-functional teams Your Location: This position is US - Remote Eligible. The role may include occasional work at an Lumen Dynamics office or attendance at offsites, as agreed to with your manager. While the position is Remote Eligible, you must live in a state where Lumen Dynamics, Inc. has a registered entity. Click here for the up-to-date list of excluded states. This list is continuously evolving, so please check back with us if the state you live in is on the exclusion list . If your position is employed by another Lumen Dynamics entity, your recruiter will inform you what states you are eligible to work from. Our Commitment To Inclusion & Belonging: Lumen Dynamics