Nextdoor

Connecting neighbors to each other - and to everything nearby.

Senior Data Scientist – Fraud Prevention

Data ScientistData ScientistFull TimeRemoteTeam 501-1,000Since 2011H1B SponsorCompany SiteLinkedIn

Location

California

Posted

21 days ago

Salary

$175K - $234K / year

Bachelor Degree5 yrs expEnglishPythonSQL

Job Description

• 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.

Job 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

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