Skip to content

Tracks

AI-assisted engineering Working with AI Agents System design Core systems Data and AI systems Coding Coding problems Code review On-call SQL

Practice

Paths Concept guides

FreeAd-supported

The plan adds AI feedback and removes ads.

Concept guides/ML systems/Fraud detection (velocity limits)

System designML systems

Fraud detection (velocity limits)

Hard3 min read

Questions it teaches

Velocity rules at authorizationMedium35 min Real-time fraud scoringHard50 min Account-takeover and collusion detectionHard50 min Fraud scoring with adaptive featuresHard50 min Payment fraud scoring systemHard45 min Real-time fraud feature storeHard45 min

Related

ML systems Pipelines and analytics AI in the system Search and feeds

Builds on: Pipelines and analytics

Analytics architecture3 min Data pipelines & warehousing3 min

Leads to: AI in the system

Keeping a model working after launch8 min ML system design3 min

Related: Search and feeds

Polling a feed for new items4 min Social feed (fan-out design)4 min

© 2026 Prep Room·From California·AI can make mistakes.

About Legal Contact Cookies Your privacy choices

Home Review Tracks Paths