LLD Data Structures in Design Context: Why Software Engineers Think Differently About Data Structures

Learning data structures enables efficient programming, but Low-Level Design (LLD) explains why these structures support real software systems. While coding interviews focus on selecting the most efficient data structure for a specific problem, experienced engineers prioritize system behavior. In LLD, the primary objective shifts from implementation to understanding what the system needs to do. Consequently, great software design begins by optimizing required behaviors rather than simply choosing data structures to solve isolated problems.