Concrete Builder (MargheritaPizzaBuilder):?

Short answer: The MargheritaPizzaBuilder is a concrete implementation of the IPizzaBuilder interface. It builds a specific type of pizza (Margherita in this case) by setting the dough, sauce, and adding toppings. The Build() method returns the fully constructed pizza. public class MargheritaPizzaBuilder : IPizzaBuilder

Example code

{
private Pizza _pizza = new Pizza();
public void SetDough(string dough) => _pizza.Dough = dough;
public void SetSauce(string sauce) => _pizza.Sauce = sauce;
public void AddTopping(string topping) => _pizza.Toppings.Add(topping); public Pizza Build() => _pizza;
}

Real-world example (ShopNest)

Use a GoF pattern in ShopNest only when it removes duplication or makes a change safer—explain the problem it solves in the interview.

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.