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Implement and compare key design patterns

TikTokSoftware Engineer · Technical Screen
MediumSoftware EngineerTechnical ScreenSoftware Engineering Fundamentals

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Implement and compare key design patterns evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

Implement simple examples of Singleton (thread-safe and lazy), Factory Method, and Strategy in Java. Compare their trade-offs, extensibility, and testability. Show how you would refactor one example to reduce coupling and enable dependency injection.