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Deep dives into System Design, Distributed Systems, and Software Architecture. Written for engineers who want to understand why, not just how.

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LLDLow-Level DesignOOP, design patterns, and clean component internals.34
SOLID, Actually: Five Rules for Code That Survives ChangeSingle Responsibility: One Reason to Change, One OwnerOpen/Closed: Add a Channel Without Touching the CorePremiumView all 34 LLD articles
HLDHigh-Level DesignDistributed systems, scalability, and architecture.21
How Consistent Hashing Powers Distributed SystemsPremiumLoad Balancing: One Front Door for a Fleet That Keeps ChangingCaching Strategies: The Bet That Reads RepeatView all 21 HLD articles
SDCSystem Design Case StudiesBuild real systems end-to-end — the interview whiteboard, worked.6
Design a URL ShortenerPremiumDesign a Distributed Rate LimiterPremiumDesign a Distributed ID GeneratorPremiumView all 6 SDC articles