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System Design Tutorials

Architecture, scalability, and distributed systems concepts for system design interviews. Each tutorial includes HLD diagrams, sequence diagrams, and deep dives.

What is System Design?

Why system design matters and how to prepare.

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URL Shortener

Design bit.ly: hashing, base62, caching, analytics.

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Chat System

Design WhatsApp: WebSocket, message storage, presence.

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News Feed

Design Twitter feed: fan-out strategies, ranking, caching.

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CAP Theorem

Consistency vs availability trade-offs in distributed systems.

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Load Balancing

Algorithms, L4 vs L7, health checks, sticky sessions.

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Caching Strategies

Cache-aside, write-through, write-behind, Redis vs Memcached.

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Database Sharding

Horizontal scaling, shard keys, rebalancing strategies.

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Message Queues

Kafka vs RabbitMQ, pub/sub, delivery guarantees.

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Consistent Hashing

Hash ring, virtual nodes, minimal data migration.

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