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Design Patterns
The 23 Gang of Four patterns explained in plain language, with code. Singleton, Factory, Observer, Strategy, Decorator, and the ones that actually matter.
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Testing
Unit, integration, and end-to-end testing. The testing pyramid. TDD. Mocking. What to test, what not to test, and why flaky tests are worse than no tests.
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System Architecture
Monolith vs microservices, REST vs GraphQL, event-driven systems, SOLID principles, and how to make architectural decisions that don't trap you later.
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