Lime

Senior Data Scientist, Payments – Fraud

Lime

full-time

Posted on:

Location Type: Remote

Location: Remote • 🇺🇸 United States

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Job Level

Senior

Tech Stack

PythonSQL

About the role

  • 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.

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
machine learningSQLPythonA/B testingcausal inferencedata manipulationdata analysispredictive modelingdata visualizationmodel deployment
Soft skills
strong communication skillsbusiness acumencollaborationproblem-solving