Functional and non-functional expectations that drive the system.

External and internal interfaces, contracts, and request flows.

High-level architecture, major services, and traffic flow.

A diagram or visual walkthrough of the architecture.

Data model, component internals, and low-level implementation details.

Bottlenecks, failure modes, and scale constraints.

The compromises made around consistency, latency, and cost.

How the system behaves under pressure, network partitions, and node failures.

Design Pattern: Factory deep dive for HLD & LLD interview preparation.

HLD & LLD Mastery Course

Design Pattern: Factory

Design Pattern: Singleton deep dive for HLD & LLD interview preparation.

Design Pattern: Strategy deep dive for HLD & LLD interview preparation.

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Introduction to Low-Level Design deep dive for HLD & LLD interview preparation.

How HLD translates to LLD deep dive for HLD & LLD interview preparation.

Introduction to High-Level Design deep dive for HLD & LLD interview preparation.

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Case Study: Design a Payment System deep dive for HLD & LLD interview preparation.