
Senior Data Scientist – Fraud Prevention
Nextdoor
full-time
Posted on:
Location Type: Remote
Location: California • United States
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Salary
💰 $175,000 - $234,000 per year
Job Level
About the role
- Analyze large, complex datasets to identify abuse patterns, fraud signals, and harmful behavior trends.
- Conduct root cause analysis to diagnose safety incidents and emerging risks.
- Evaluate new tool effectiveness (including AI), and impact on agent efficiency and user satisfaction.
- Define and track core metrics (e.g., harm prevalence, violation rates, detection accuracy).
- Navigate the tradeoff between operational efficiency, safety, and user growth/experience.
- Build dashboards and reporting frameworks to track platform health and safety performance.
- Develop heuristics, statistical models, and machine learning solutions for proactive detection of abuse, fraud, or harmful content
- Build prediction systems (e.g., anomaly detection, risk scoring, behavioral profiling).
- Improve automated enforcement and moderation workflows.
- Evaluate model performance and iterate on detection strategies.
- Design and analyze experiments (A/B tests, causal inference) to measure safety feature impact (e.g., login & verification, AI moderation support). Clearly communicate findings to technical and non‑technical stakeholders.
- Quantify tradeoffs between operational efficiency, safety, and user growth/experience. Guide TnS team on key tradeoffs in decision-making
- Partner with Product, Engineering, Operations, Policy, and Legal teams to define safety strategy.
- Influence decision-making through data storytelling and insights.
- Standardize analytical methodologies and tools for scalable decision-making.
Requirements
- Bachelor’s or Master’s degree in Statistics, Computer Science, Mathematics, Economics, or a related quantitative field.
- 5+ years of Data Science experience working with large-scale data and statistical analysis, including 1+ year of data science experience in fraud prevention, moderation, or risk.
- Strong analytical and problem‑solving skills, with a track record to lead projects from concept to impact.
- Proficiency in SQL and at least one scripting language (e.g., Python or R).
- Expertise in experimentation and causal inference (A/B testing, cohort analysis, pre/post analysis) to evaluate product or policy changes in production environments.
- Hands-on experience with standard Machine Learning and statistical methods (e.g., prediction, classification, anomaly detection, time series), ideally in risk or fraud prevention contexts.
- Ability to collaborate cross‑functionally with Product, Engineering, Operations, and Legal/Policy partners; comfortable influencing without direct authority.
- Strong communication, with the ability to translate technical concepts to non‑technical stakeholders, including operations leaders and executives.
Benefits
- Health plans
- Equity grant
Applicant Tracking System Keywords
Tip: use these terms in your resume and cover letter to boost ATS matches.
Hard Skills & Tools
data analysisroot cause analysisstatistical modelsmachine learninganomaly detectionrisk scoringA/B testingSQLPythonR
Soft Skills
analytical skillsproblem-solvingcommunicationcollaborationinfluencedata storytellingproject leadershipdecision-makingcross-functional teamworkquantitative reasoning