Q11. When would you choose an interface over an abstract class?
Both define contracts that other types implement, but they differ in intent and mechanics. - An interface declares a contract with no state (traditionally) and supports m...
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Q12. How should a REST API format error responses?
Use one consistent, machine-readable shape. A widely adopted choice is RFC 7807 `application/problem+json`: ```json { "type": "https://example.com/problems/insufficient-f...
Q13. How would you design a thread pool?
A thread pool keeps a set of worker threads alive so tasks avoid per-request thread-creation cost. Core pieces: - A task queue, typically bounded, holding runnable work. ...
Q14. How would you design a recommendation system end to end?
Start with the objective and data: implicit signals such as views, clicks and purchases, plus explicit ratings and item or user features. A common two-stage design: - Can...