Master Low Level Design

LLD Problems

A curated collection of common Low Level Design interview problems. Learn patterns, practice modeling, and ace your LLD/Machine coding rounds.

LLD Problems

Design Parking Lot.

Design an API rate limiter.

Design an Automated Teller Machine (ATM) System

Design a key value store and an Index.

Design a system which keeps track of leaders for some contest. Like referrals leader.

Design Chat Based application like whatsapp/wechat.

Design Game Streaming platform.

Design message queueing system

Design system for short video/content sharing like Tiktok.

Design the Food Ordering System like Swiggy/Zomato.

Notification Service design.

Design a distributed Cache.

Design a scheduler, that takes in 10 scheduling requests at a time and can execute 100 jobs at a time.(The scheduler executes http requests.)

Design a user activity tracking system for user on mobile.

Design a UUID generator.

Design Ads system for a website.

Design Car Rental System like Zoomcar.

Design Community based discussion platform.

Design push notification :

Design Real time collaboration application for the teams.

Design Splitwise.

Developing a message queueing system.

Design System Simiar to the Product-hunt (share and discover new products)

Design a Cache Mechanism.

Design a suggestion system

Design Authentication/Authorization Service which supports(otp,OAuth, etc.).

Design Chess Game.

Design Inventory System.

Design monitoring and alert system for the production as well and other enviroments.

Design Short Story Telling (Text/Images) platform like Terribly Tiny Tales.

Design Splunk like log manager system supporting queries with filters on last min, hr, day, week etc.

Implement a wide column store like Cassandra (bonus : support secondary indexes).

Create an online music recommendation system which suggests songs according to user taste.

Design a billing and auctioning system similar to EBay.

Design a calendar Application (similar like Google Calendar)

Design and Architecture - Appointment booking for a hospital where each doctor can open slots independently of any time period.

Design LinkedIn.

Order-Management-System-or-System-Design.

Build the Google Stock Wizard.

Design a stock exchange system. There is a list of stocks given with following attributes

Design Logging Framework

Design Navigation Alerts System. (Similar like Google Map Functionality.)

Design Real-Time Translation platform.

Design subscription-based sports website which can display scores, game status, history for any games.

Design Truecaller.

Design a generic coupon/promocode system.

Design a Logistics System

Design a scalable weather service that pulls data from an API.

Design an concurrent History tracking system where we can store and track history of registered entities. We should be able to onboard service and their entities to our system and start tracking

Design for online card game say like poker or any other game.

Design Freelancing hiring platform.

Design library management system.

Design Virtual Event Platform for Communities / Enterprise.

code a TextPad with following functionality:

Design Amazon comments filtering system

Design Payment Gateway like Razorpay.

Design pricing / product comparision system.

Design Q&A application as in Amazon,Walmart has it for each product.

Design system for salary info,comparsion and other info similar to the glassdoor salary / salarry.level.

Design Visual workplace for remote teams.

Implementation of Kafka.

Design a Plagiarism checker.

Design an online code judge.

Design application for restaurant / malls to efficiently handle waiting queue and optimizely assign the table.

Design job posting system dedicated to blue and grey collar workers. (multiple langs / native lang)

Design Mock Interview System like pramp.

Design Online UML Diagram Tool like lucidchart.

Design service like Clipboard. (try to store the maximum clips)

Design User Engagment platform.

Design a geographically partitioned multi-player card game, that supports multiple players, multiple games at a time.

Design a system like Jira. It should have the following functionalities :

Design product experience platform like pendo.

Design Secure Content Management platform.

Design Survey similar to Google Forms / SurveyMonkey.

Design a electronic signature system like DocuSign / EasySign.

Design a locker

Design Learning Management System

Design Maps Navigator Client for different transportation types

Design Online Exam Portal.