intermediatePractical Service Design19 of 132
Write a complete service on paper: Controller → Service → DAO → Entity
Tests whether you keep validation and request/response mapping in the controller, business rules in the service, and persistence concerns isolated in the DAO, rather than leaking SQL or HTTP concepts across layers.
Ready to design this system end to end?
Generate a complete, structured system design answer — requirements, capacity estimation, API design, architecture, database choice, scaling, caching, fault tolerance, security, trade-offs, and more, walked through the way a strong senior engineer would in a real interview.
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