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Track 3 — LLD

Low-Level Design

SOLID, GoF patterns the way practitioners actually use them, and 15 fully reasoned LLD problems — parking lot, elevator, chess, Splitwise, rate limiter, BookMyShow.

How to approach an LLD interview

3 min read · 4 sections

SOLID principles in practice

2 min read · 6 sections

Design patterns refresher

3 min read · 4 sections

Class relationships and notation

2 min read · 3 sections

Problem 1: Design a Parking Lot

7 min read · 14 sections

Problem 2: Design an Elevator System

6 min read · 11 sections

Problem 3: Design an ATM

6 min read · 10 sections

Problem 4: Design a Library Management System

5 min read · 11 sections

Problem 5: Design a Chess Game

6 min read · 8 sections

Problem 6: Design Tic-Tac-Toe

3 min read · 8 sections

Problem 7: Design Splitwise

5 min read · 10 sections

Problem 8: Design a Vending Machine

3 min read · 6 sections

Problem 9: Design an LRU Cache

3 min read · 5 sections

Problem 10: Design a Logger

3 min read · 8 sections

Problem 11: Design BookMyShow / Movie Booking

3 min read · 7 sections

Problem 12: Design a Pub-Sub System

2 min read · 6 sections

Problem 13: Design a Thread Pool

2 min read · 4 sections

Problem 14: Design a File System

2 min read · 4 sections

Problem 15: Design a Rate Limiter (LLD)

2 min read · 3 sections

Patterns frequency map across the 15 problems

2 min read · 0 sections

Master reading list

2 min read · 3 sections