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This handbook is a curated compilation of Low-Level Design (LLD) principles, object-oriented design patterns, and system modeling techniques frequently tested in software engineering interviews. Each topic includes core concepts, real-world examples, design trade-offs, along with links to practice resources and common pitfalls to avoid.
21 low-level design interview systems + 9 Java drills. Plain javac, no dependencies — every folder compiles, runs, and shows the design decision it exists to make.