Lead Decision Scientist, Security

VintedAmsterdamHybridFull-time2 Oct 2026

Vinted is seeking a Lead Decision Scientist in Security to serve as the senior technical lead for measurement, evaluation, and decision frameworks across critical member touchpoints. The role focuses on balancing member friction against harm prevention, owning domain metrics, and raising experimentation standards. Requires strong experience in Decision Science, A/B testing, causal inference, and proficiency in SQL and Python or R.

What you'll do

Build decision frameworks for user restrictions: Design the logic that determines which restriction measure to apply (such as verification challenges or account bans) based on user risk and context.
Balance member friction against harm prevention: Quantify the trade-offs between stopping malicious actors early and keeping the onboarding experience seamless for genuine members.
Lead strategic cross-team discovery: Tackle open-ended questions across the user journey, such as analyzing duplicate/multiple account networks, assessing bot patterns, or evaluating third-party security tools versus in-house solutions.
Own domain metrics and impact measurement: Build and maintain the Security metric tree, guiding target-setting so product and business strategies are grounded in clear, measurable impact.
Raise experimentation standards: Guide best practices in A/B testing and causal inference in complex environments where traditional experimentation isn't always straightforward.
Mentor and lead through influence: Coach embedded Decision Scientists across Security teams, foster a culture of open feedback and continuous learning, and elevate data literacy across the domain.

What you need

Must-have

SQLPythonRA/B testingCausal inferenceDecision ScienceProduct AnalyticsEconometrics

Nice-to-have

Trust & safetyFraud preventionRisk assessmentCybersecurityTwo-sided marketplaces

Soft skills

CommunicationCollaborationStructured problem solvingMentoringLeadershipInfluenceFeedbackContinuous learningData literacy

Decision ScienceSecurityTrust & SafetyFraud PreventionProduct AnalyticsExperimentationCausal InferenceSQLPythonRemote

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What you'll do

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