Data Scientist

Cloudflare builds and operates a large global network that protects and accelerates Internet applications. Its Detection department identifies automated, fraudulent, and malicious activity across the Internet and through its gateway, developing detection systems and machine learning models at scale. Cloudflare is committed to protecting the free and open Internet and to diversity and inclusion.

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

• Experience across fraud, abuse, and/or bot detection on large, high-velocity traffic.
• Strong applied statistics, machine learning, and AI methodology fundamentals; ability to select suitable techniques and work fluently with large-scale data.
• At least 8–10 years of professional experience in Data Science, ML Engineering, or Software Engineering.
• Demonstrated ability to make ambiguous, high-stakes technical decisions with incomplete information.
• Comfortable using Python and SQL in production environments.
• Ability to make progress with weak, delayed, or absent labels and work with adversarial behavior.
• Understand or be curious to learn how detection actions can erode future visibility.
• Pragmatic approach to complexity; strong programming and engineering practices in research and production code; ability to connect work to business impact and communicate with technical and non-technical stakeholders.

• Hybrid role; available locations are New York and London.
• Compensation may vary by work location. For New York City-based hires, estimated annual salary is $215,000–$225,000. The role is eligible for Cloudflare’s equity plan.
• Benefits for U.S. employees include medical/Rx, dental and vision insurance, flexible spending and commuter spending accounts, fertility and family-forming benefits, on-demand mental health support and an Employee Assistance Program, global travel medical insurance, short- and long-term disability insurance, life and accident insurance, a 401(k) retirement savings plan, an Employee Stock Participation Plan, flexible paid time off covering vacation and sick leave, and parental, pregnancy health, medical, and bereavement leave. Benefits may vary outside the U.S.
• Applicants progressing to the offer stage may be asked to attend an in-person interview at a Cloudflare office or hub.
• The position may require access to information protected under U.S. export control laws. Offers may be conditioned on authorization to receive controlled software or technology without sponsorship for an export license.
• Cloudflare provides reasonable accommodations to qualified applicants with disabilities.