At what level of interviews is the need to use primitive data types in programming considered?

The necessity of using primitive data types is usually considered at the initial interview stages — for intern and junior levels. This is because understanding the difference between primitives and objects, their memory, and performance is fundamental knowledge for a programmer.

At these levels, the following are checked:

• Knowledge of basic primitive types (int, double, boolean, etc.).
• Understanding that primitives are stored in the stack and occupy less memory.
• The difference between primitives and wrapper objects (e.g., Integer).

At higher levels (middle and above), the focus shifts to architecture, patterns, and optimization, where primitives are considered as part of a general understanding of the language.