Nextdoor

Senior Data Scientist – Fraud Prevention

Nextdoor

full-time

Posted on:

Location Type: Remote

Location: CaliforniaUnited States

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Salary

💰 $175,000 - $234,000 per year

Job Level

Tech Stack

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