HLD

High-Level Design

11 interview-ready notes — scratch to pro with examples and quick revision at the end of each.

• 1. Message Queues

  Producers, consumers, ACKs, Kafka vs SQS
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• 2. Load Balancing

  L4/L7, algorithms, health checks, stickiness
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• 3. Caching Strategies

  Cache-aside, eviction, stampede, Redis
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• 4. Database Scaling

  SQL vs NoSQL, replicas, sharding, indexes
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• 5. CAP & Consistency

  CP vs AP, quorums, consistency models
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• 6. API & Rate Limiting

  REST, gateway, token bucket, idempotency
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• 7. Microservices

  Boundaries, sync/async, circuit breaker
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• 8. CDN & Content Delivery

  Edge caching, headers, invalidation
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• 9. Consistent Hashing

  Hash ring, vnodes, distributed caches
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• 10. Saga Pattern

  Distributed TX, compensation, outbox
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• 11. News Feed Design

  Full Twitter-style system design walkthrough
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