Your system currently uses SQL Server, but the company wants to migrate to MongoDB without touching the business logic. How can this be done using ports and adapters?, Your business logic depends directly on a real database, making unit tests slow and unstable. How can you isolate the core to make testing easier?, You already have a web UI, and management wants a command-line interface for developers. How can Hexagonal Architecture help you add a new UI?, Your traditional layered app has business logic that depends on the data layer, making changes risky. How can Onion Architecture invert this dependency?, After a user registers, the system must send an email, but the core should not know how emails work. How can you integrate email sending without coupling it to the core?, When a payment is completed, several actions must occur (update reports, send alerts). Where should domain events be triggered and handled?, Your app has complicated queries mixed with write operations, causing confusion. How can CQRS fit into Onion or Clean Architecture?, Your app is built with ASP.NET MVC today, but the company may switch frameworks later. How can Clean Architecture prevent framework dependency?, You must connect to an external payment API that may change providers in the future. How can gateways protect your core logic?, Developers want an in-memory repository for tests and a SQL one for production. Where should the repository interface and implementations live?.

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