Choose your next design problem

Design a File System - LLD Interview Problem. Master hierarchical structures & path resolution. Solutions in Python, Java, C++, TS, JS & C#.

Design an Elevator System - LLD Interview Problem. Master request dispatching & state management. Solutions in Python, Java, C++, TS, JS & C#.

Tutorial: Design a Parking Lot System - LLD Interview Problem. Master Singleton & Factory patterns. Solutions in Python, Java, C++, TS, JS & C#.

Design a Chess Game - LLD Interview Problem. Master move validation & state management. Solutions in Python, Java, C++, TS, JS & C#.

Design a Coffee Machine - LLD Interview Problem. Master state patterns & inventory management. Solutions in Python, Java, C++, TS, JS & C#.

Design a Hotel Management System - LLD Interview Problem. Master reservation logic & state transitions. Solutions in Python, Java, C++, TS, JS & C#.

Design a JSON Parser - LLD Interview Problem. Master recursive descent parsing & tokenization. Solutions in Python, Java, C++, TS, JS & C#.

Design a Library Management System - LLD Interview Problem. Master resource tracking & fine calculation. Solutions in Python, Java, C++, TS, JS & C#.

Design a Movie Ticket Booking System - LLD Interview Problem. Master concurrent seat allocation & locking. Solutions in Python, Java, C++, TS, JS & C#.

Design a Restaurant Management System - LLD Interview Problem. Master table state & order flow. Solutions in Python, Java, C++, TS, JS & C#.

Design a Trie (Prefix Tree) - LLD Interview Problem. Master prefix matching, autocomplete & DFS traversal. Solutions in Python, Java, C++, TS, JS & C#.

Design a Vending Machine - LLD Interview Problem. Master state machine & change calculation. Solutions in Python, Java, C++, TS, JS & C#.

Design an Online Shopping Cart - LLD Interview Problem. Master discount strategies & total calculation. Solutions in Python, Java, C++, TS, JS & C#.

Design an LRU Cache - LLD Interview Problem. Master HashMap + Doubly Linked List for O(1) operations. Solutions in Python, Java, C++, TS, JS & C#.

Design a Logging Framework - LLD Interview Problem. Master handler chains & formatting strategies. Solutions in Python, Java, C++, TS, JS & C#.

Design a Task Management System - LLD Interview Problem. Master state transitions & observer pattern. Solutions in Python, Java, C++, TS, JS & C#.

Design a Tic Tac Toe Game - LLD Interview Problem. Master grid logic & win detection. Solutions in Python, Java, C++, TS, JS & C#.

Design a Car Rental System - LLD Interview Problem. Master booking logic & pricing strategies. Solutions in Python, Java, C++, TS, JS & C#.

Design a HashMap - LLD Interview Problem. Master collision handling & dynamic resizing. Solutions in Python, Java, C++, TS, JS & C#.

Design a Meeting Room Reservation System - LLD Interview Problem. Master conflict detection & recurring bookings. Solutions in Python, Java, C++, TS, JS & C#.

Design a Meeting Room Scheduler - List Bookings - LLD Interview Problem. Master filtering & pagination. Solutions in Python, Java, C++, TS, JS & C#.

Design a Rate Limiter - LLD Interview Problem. Master token bucket & sliding window algorithms. Solutions in Python, Java, C++, TS, JS & C#.

Design a Restaurant Food Ordering System - LLD Interview Problem. Master order state & delivery assignment. Solutions in Python, Java, C++, TS, JS & C#.

Design an Elevator System - Multiple Lifts - LLD Interview Problem. Master load balancing & request distribution. Solutions in Python, Java, C++, TS, JS & C#.

Design a Train Platform Management System - LLD Interview Problem. Master platform assignment & schedule management. Solutions in Python, Java, C++, TS, JS & C#.

Design a URL Shortener - LLD Interview Problem. Master encoding algorithms & redirection. Solutions in Python, Java, C++, TS, JS & C#.

Design an ATM System - LLD Interview Problem. Master state management & concurrent transactions. Solutions in Python, Java, C++, TS, JS & C#.

Design an Order Matching Engine - LLD Interview Problem. Master price-time priority & order book. Solutions in Python, Java, C++, TS, JS & C#.

Design an Elevator System - Single Lift - LLD Interview Problem. Master SCAN algorithm & request prioritization. Solutions in Python, Java, C++, TS, JS & C#.

Design a Locker Management System - LLD Interview Problem. Master size-based allocation & access control. Solutions in Python, Java, C++, TS, JS & C#.

Design a Cache Manager - LLD Interview Problem. Master LRU/LFU eviction & TTL expiration. Solutions in Python, Java, C++, TS, JS & C#.

Design a Chat Room Manager - LLD Interview Problem. Master message queuing & presence tracking. Solutions in Python, Java, C++, TS, JS & C#.

Design a Feed Generator - LLD Interview Problem. Master ranking algorithms & content aggregation. Solutions in Python, Java, C++, TS, JS & C#.

Design a File Manager - LLD Interview Problem. Master file chunking & metadata management. Solutions in Python, Java, C++, TS, JS & C#.

Design a Notification Service - LLD Interview Problem. Master multi-channel delivery & retry logic. Solutions in Python, Java, C++, TS, JS & C#.

Design a Parking Lot - Multi-threaded - LLD Interview Problem. Master thread safety & deadlock prevention. Solutions in Python, Java, C++, TS, JS & C#.

Design a Payment Processor - LLD Interview Problem. Master idempotency & transaction state management. Solutions in Python, Java, C++, TS, JS & C#.

Design a Search Index - LLD Interview Problem. Master inverted index & relevance ranking. Solutions in Python, Java, C++, TS, JS & C#.

Design a Task Scheduler - LLD Interview Problem. Master DAG dependencies & exponential backoff. Solutions in Python, Java, C++, TS, JS & C#.

Design an Elevator System - Request Feasibility - LLD Interview Problem. Master route planning & feasibility checks. Solutions in Python, Java, C++, TS, JS & C#.

Design a Music Streaming Service - LLD Interview Problem. Master playlist management & recommendations. Solutions in Python, Java, C++, TS, JS & C#.

Design an Ngrok Tool - LLD Interview Problem. Master secure tunneling & protocol handling. Solutions in Python, Java, C++, TS, JS & C#.

Design a Snake and Ladder Game - LLD Interview Problem. Master board game logic & turn management. Solutions in Python, Java, C++, TS, JS & C#.