Design a malicious-URL checking service using an isMalicious API

Company: LinkedIn

Role: Software Engineer

Category: System Design

Difficulty: medium

Interview Round: Onsite

Quick Answer: This question evaluates system design competencies such as scalable API design, caching and cache invalidation strategies, rate limiting and backpressure, fault tolerance and circuit-breaking, data modeling for reputation storage, partitioning, and operational metrics for reliability.