For a decade the default advice was "rewrite it as microservices." That advice was wrong for most teams, and the bill came due in network latency, distributed transactions, and an observability stack that cost more than the product. The modular monolith is the architecture most people actually wanted: strict internal boundaries inside a single deployable, with none of the distributed-systems tax.
System-Design
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The Modular Monolith -
PRD: FreshDeal — A Real-Time Food Discount Discovery Platform Product Requirements Document for FreshDeal, a web platform that aggregates, filters, and surfaces the best current restaurant and food service discounts by location, cuisine type, and deal quality — with automatic expiration to ensure only live deals are ever shown.