Quick Overview

This question evaluates a developer's ability to implement real-time rule-based rate limiting, covering rule matching, time-windowed quota enforcement, state management for high-cardinality keys, and algorithmic/data-structure choices.

Implement a rule-based rate limiter

Company: Cloudflare

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: medium

Interview Round: Onsite

Overview: This question evaluates a developer's ability to implement real-time rule-based rate limiting, covering rule matching, time-windowed quota enforcement, state management for high-cardinality keys, and algorithmic/data-structure choices.

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