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Designing a Parking Lot - Low Level Design

Problem Statement Design a parking lot that can handle vehicles entering and leaving while managing parking across multiple floors. Each vehicle should be assigned a suitable parking spot based on its type, and the spot should be freed once the vehicle exits. The design should also support generating a ticket at entry and optionally calculating the parking fee based on the duration of stay. Asked In Companies Amazon Google Microsoft Uber Walmart Flipkart Meta PayPal Oracle Salesforce Adobe Apple Intuit LinkedIn Atlassian Functional Requirements The design should support multiple vehicle types such as bikes, cars, and trucks A vehicle must be assigned a parking spot compatible with its type A parking spot cannot be assigned to more than one vehicle at a time The parking lot should support multiple levels (floors) The design should search and allocate an availa...
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Most Frequently Asked Low Level Design(LLD) Interview Questions

Below are the curated list of most commonly asked Low Level Design (LLD) interview problems. Each problem includes a short description and a link to the complete solution with code and class diagrams. Design Parking Lot System The system should handle parking for different vehicle types such as bikes, cars, and trucks. It should manage slot allocation, availability tracking, and entry/exit flow. The design also ensures efficient usage of parking space under varying load conditions. View Solution Design Elevator / Lift System The system should support multiple elevators operating across floors with request handling logic. It focuses on scheduling algorithms to minimize wait time and optimize movement. It also manages direction control and concurrent floor requests. View Solution Design Movie Ticket Booking System The system should allow users to browse movies, select shows, and book seats. It handles seat ...
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Software Design Patterns for LLD Interviews: A Complete Guide

Software Design Patterns for LLD Interviews: A Complete Guide In Software Development Engineer (SDE) interviews—especially for mid-level and senior roles—low-level design (LLD) rounds assess your ability to write clean, reusable, maintainable, and extensible code. The foundation of resolving these architectural challenges lies in the standard Gang of Four (GoF) Design Patterns. Rather than memorizing theoretical definitions, interviewers expect you to apply these patterns to real-world scenarios, identifying the trade-offs of each. Below is a comprehensive guide to the 12 most frequently asked design patterns in LLD interviews, categorized by their classification (Creational, Structural, and Behavioral). Each pattern contains a concrete, real-world Java implementation and a detailed breakdown of design decisions. Creational Design Patterns Creational design patterns deal with object creation mechanisms. They abstract the instantiation process, making a system independent of how...
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