System Design: Rate Limiter Service
Design a distributed rate limiter — token bucket, sliding window, fixed window algorithms with Redis, and multi-region support.
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System Design: Design a URL Shortener at Scale
Full URL shortener system design for 100M URLs/day.
System Design: Design Instagram Feed (Fan-Out Strategies)
Compare fan-out-on-write vs fan-out-on-read for a social feed.
System Design: Distributed Rate Limiter
Design a rate limiter that works across many servers and multiple tiers.
System Design: Payment Processing System
Design a payment system with idempotency, webhooks, and reconciliation.