Low Level Design
Pick a track
SOLID principles, GoF design patterns, the core LLD course, and full interview problem breakdowns.
SOLID Principles
SRP through DIP with wrong-vs-right Java — how the five compose, and interview answers out loud.
8 guides · PrinciplesOpen
Design Patterns
GoF patterns explained clearly — wrong vs right, multi-language examples, and when not to use them.
13 patterns · 4 languagesOpen
LLD Course
Delivery framework, OOP, design principles, and concurrency themes — the spine of every LLD interview.
9 guides · Foundations → concurrencyOpen
LLD Interview Questions
End-to-end problem breakdowns interviewers ask — parking lot through movie booking.
9 guides · ProblemsOpen