Can you provide an example of ISP violation?

Short answer: Violation Example: public interface IWorker

Example code

{ void Work(); void Eat(); void Sleep(); }
public class Robot : IWorker
{
public void Work() { /* logic */ }
public void Eat() { throw new NotImplementedException(); }
public void Sleep() { throw new NotImplementedException(); }
} ❌ Robot is forced to implement Eat() and Sleep(), which don’t make sense for it.

Real-world example (ShopNest)

Open/Closed in ShopNest: add a new payment method by adding a class, not by editing a giant switch in CheckoutService.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.