Senior Data Scientist, Payments – Fraud

Job Description: • Design and evaluate strategies to reduce fraud and abuse across promotions, referrals, refunds, and payment flows. • Develop and improve machine learning models, rules-based systems, and heuristics to detect high-risk behavior while minimizing false positives. • Analyze experimental and observational data using A/B testing and causal inference to measure the effectiveness of interventions in payments and fraud prevention. • Identify and quantify key friction points in the payments funnel (e.g., latency, failure rates, PSP routing), and partner with Engineering to improve reliability and speed. • Build dashboards, reports, and self-serve tools to empower teams with visibility into fraud trends, payment performance, uncollected revenue, and risk tradeoffs. • Collaborate on incident response and root cause analyses for fraud and abuse events, ensuring rapid mitigation and long-term prevention. • Stay informed on evolving fraud tactics, risk mitigation techniques, and payment technologies to proactively shape Lime’s strategy. Requirements: • MS or PhD in Statistics, Economics, Computer Science, Applied Mathematics, Operations Research, or a related quantitative field. • 5+ years of industry experience as a Data Scientist, with a focus on payments, fraud detection, risk mitigation, or user trust. • Deep understanding of probability and statistics, including causal inference and experimental design. • Proficiency in SQL and Python, with end-to-end experience with data—including querying, data manipulation, aggregation, analysis, visualization , and model deployment. • Machine Learning & Modeling: Strong understanding of predictive modeling, price elasticity estimation, and customer segmentation techniques. • Business Acumen: Strong intuition for how pricing and loyalty strategies impact revenue, customer behavior, and long-term retention. • Strong communication skills with the ability to convey technical concepts to non-technical stakeholders. Benefits: • Comprehensive Health & Wellness: A choice of medical, dental, and vision plans. We also provide company-paid life and disability insurance and company-funded mental health benefits. • Financial & Retirement Planning: 401(k) plan with both pre-tax and Roth options, and access to a Health Savings Account (HSA) with a monthly company contribution. • Family & Fertility Support: Paid parental leave for birthing and non-birthing parents, plus fertility and family-forming benefits. • Paid Time Off: Unlimited vacation, paid leaves, and 10 company holidays. • Unique Lime Perks: Complimentary use of Lime vehicles in participating cities, a monthly phone allowance, dedicated learning and development days, and access to perks including One Medical, Wellhub, and Headspace. Apply tot his job