How to Identify Entities and Model Relationships in LLD Interviews

In most LLD interviews, the quality of your solution depends heavily on how well you model the problem before writing any code. And at the heart of good modeling lies one critical skill: identifying the right entities and defining how they relate to each other.

Many candidates jump straight into classes, methods, and design patterns. But strong designs rarely begin there. They begin with understanding the domain. What are the core objects in the system? What data do they hold? How do they interact? Which objects own or control others?

Getting these fundamentals right makes the rest of the design feel natural and coherent. Getting them wrong leads to confusion, tight coupling, and fragile code.

This chapter will teach you how to systematically extract entities from problem statements.