- Single Responsibility: A class should have only one reason to change. - Open/Closed: Software entities should be open for extension, closed for modification. - Liskov Substitution: Subtypes must be substitutable for their base types. - Interface Segregation: Prefer many client-specific interfaces over one general-purpose interface. - Dependency Inversion: Depend on abstractions rather than concrete implementations.
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A beginner-friendly guide to High-Level Design (HLD): load balancers, caching, database indexing, horizontal scaling, and microservices.
Folder organization, configuration segregation, automated linter/prettier configs, and meaningful unit test structures that signal maturity.
Deep-dive questions on REST vs GraphQL vs gRPC, JWT vs session authentication, database connection pooling, and eventual consistency.