Why write HLD before LLD?
HLD settles the architecture and surfaces missing pieces (like where emails come from). Skipping HLD means discovering those gaps during LLD or worse, during coding.
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More FAQs in What Is High-Level Design (HLD)? With Example
The big-picture view of a system. It shows the major components, how they talk, external systems, the tech stack, and data flow. Anyone should understand it in 30 seconds.
Major components, how they communicate, external systems (database, cache, email provider, queue), the tech stack, and data flow from input to output.
Field-level schema details, exact API endpoints, internal algorithms, and edge cases. Those belong to LLD.
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