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Principal Data Scientist, Detection

Cloudflare· Engineering
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Hybrid (New York, NY / London, UK)$215k - $225kfull-timePosted 1mo ago

About the role

Lead the research, design, and evaluation of detection models for automated, fraudulent, and malicious activity at internet scale. Mentor teams, own the detection measurement framework, drive adoption of AI/ML techniques, and shape long-term detection strategy in collaboration with ML Engineers, Data Engineers, and Product.

Responsibilities

  • Lead the research, design, and evaluate detection models that identify automated, fraudulent, and malicious activity across Internet-scale data
  • Mentor others in how to uncover patterns and behaviors that distinguish adversaries from legitimate users
  • Own the detection measurement framework, defining metrics and evaluation strategies for problems where ground truth is noisy, delayed, or contested
  • Drive adoption of promising AI/ML techniques and represent Cloudflare in the broader research community
  • Drive cross-functional partnerships with ML Engineers, Data Engineers, and Product; Influence roadmaps and align detection strategy with company priorities
  • Shape long-term detection strategy, identifying gaps and opportunities that span multiple product areas

Qualifications

  • Fraud and bots at scale. You have experience across fraud, abuse, and/or bot detection on large, high-velocity traffic. You may focus on one, but you transfer instincts between them
  • Strong fundamentals, fluent in data. You have solid applied statistics, machine learning, and AI methodology fundamentals. You choose the right technique for the problem, and are fluent with large-scale data
  • 8-10 years of experience professionally working in Data Science, ML Engineering, or Software Engineering
  • Demonstrated ability to make ambiguous, high-stakes technical decisions with incomplete information
  • Very comfortable with Python & SQL in production environments

Skills

Required:Fraud/bot detectionApplied statisticsMachine learning / AIPythonSQL

Benefits

  • Health & Welfare Benefits: Medical/Rx Insurance
  • Dental Insurance
  • Vision Insurance
  • Flexible Spending Accounts
  • Commuter Spending Accounts
  • Fertility & Family Forming Benefits
  • On-demand mental health support and Employee Assistance Program
  • Global Travel Medical Insurance
  • Financial Benefits: Short and Long Term Disability Insurance
  • Life & Accident Insurance
  • 401(k) Retirement Savings Plan
  • Employee Stock Participation Plan
  • Time Off: Flexible paid time off covering vacation and sick leave
  • Leave programs, including parental, pregnancy health, medical, and bereavement leave
Last updated Oct 21, 2026. Interested? Apply on the company site.

About Cloudflare

Connect, protect, and build everywhere | Cloudflare

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