base on Curated Collection of all Low level design Questions and implementation asked in major Tech companies , Get yourself prepared for the LLD round and ace the interview. # Low level Design / Machine Coding Question Collections <br /> --- <br /> ### What is Machine Coding Round ? <br /> > Machine Coding Round has become very popular interview round in most Product and startup companies like Flipkart, Cleartrip, navi and Udaan,the way the round is structured is the candidate will be provided with a Problem statement and the minimum set of features which needs to implemented within the 90 min window period, we as a candidate need to identity the data models, the service interfaces which will be consumed by the clients and other set of functions and classes, we should be able to present the same to the panel with are design choices / design patterns being made / used and the complete working code. <br /> <br /> ### What is the purpose behind this LLD repo ? > During my recent Preparation, found out that there was no single resources where we get a collections of all the questions and the corresponding Answers, so currently updating the repo with all the materials I found out from the web and the Questions which has been asked during my interview. feel free to contribute any questions you have got during your recent interview.There other useful YT channel and Git repo which are attached in the resources section. <br /> <br /> ### What is target Audience, do all companies ask ? > If you are currently targeting/looking out for any SDE - I,II opportunities. It totally depends on the company you interviewing with, you can check with the HR if they evaluate via machine coding round, but certain companies do ask a object oriented design round where they focus only on one particular feature and DB design as well, so its good get practiced with few problems beforehand. <br /> --- #### Below are the list of LLD problem which are asked during my machine coding rounds from tech companies and the resources I collected. <br /> ##### Note : page is under construction, you can click on the individual packages to view all the questions and solutions. --- | Low Level Design Question <br></br> | Question Link to PDF / Drive <br></br> | Company Asked<br></br> | Credits to author <br></br> | |:----------------------------------------------------------------------------------------------------------: |:------------------------------------------------------------------------------------------------------------------: |:--------------------------------------: |:----------------------------------------------------------------------------: | | [Cricket Match Dashboard](https://github.com/kumaransg/LLD/tree/main/Cricket%20Match%20Dashboard) | [Leetcode](https://leetcode.com/discuss/interview-question/990227/udaan-assignment-cricket-match-dashboard) | Udaan Assignment | | | [Event Calendar](https://github.com/kumaransg/LLD/tree/main/Event_calendar_flipkart) | [PDF link](https://github.com/kumaransg/LLD/blob/main/Event_calendar_flipkart/Event%20Calendar.pdf) | Flipkart LLD Question | | | [FoodKart or food ordering System](https://github.com/kumaransg/LLD/tree/main/FoodKart) | [Doc link](https://docs.google.com/document/d/1Bmkz9omByHqVvwU45cvkBRSwJAPKw9yaDsRlEnCg_lg/edit#) | Flipkart LLD Question | | | [Stock Exchange](https://github.com/kumaransg/LLD/tree/main/StockExchange) | [Problem Link](https://github.com/kumaransg/LLD/tree/main/StockExchange) | Navi LLD Question | | | [PropertyHunt or property Listing site](https://github.com/kumaransg/LLD/tree/main/PropertyHunt) | [Question image](https://github.com/kumaransg/LLD/tree/main/PropertyHunt/Question%20Image) | ClearTrip LLD Question | | | [ledger company](https://github.com/kumaransg/LLD/tree/main/ledger_company_navi) | [Question Link](https://www.geektrust.in/coding-problem/backend/ledger-co) | Navi LLD Question | [Github code](https://github.com/gauravmassand/ledger-company) | | [Leetcode Like platform LLD](https://github.com/kumaransg/LLD/tree/main/leetcode-lld-flipkart-coding-blox) | [PDF link](https://github.com/kumaransg/LLD/blob/main/leetcode-lld-flipkart-coding-blox/SDE2-%20MC%20Question.pdf) | Flipkart LLD Question | [Github code](https://github.com/hocyadav/leetcode-lld-flipkart-coding-blox) | <br /> --- <br /> ## Frequently asked Problems <br /> | Low Level Design Question | Question Link to PDF / Drive | Company Asked | Credits to author | |---------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------|-----------------------------------|---------------------| | [Ride Sharing like App](https://github.com/kumaransg/LLD/tree/main/Ride%20Sharing%20) | [Problem Link](https://github.com/kumaransg/LLD/tree/main/Ride%20Sharing%20/RideShare_MachineCoding_Sample) | Frequently asked in all companies | | | Design Lift/Elevator | [Solution-1](https://lldcoding.com/design-lld-lift-machine-coding) | Frequently asked in all companies | | | Design 2048 Game | [Solution-1](https://lldcoding.com/design-lld-2048-game-machine-coding) | Frequently asked in all companies | | | Design Splitwise | [Solution-1](https://lldcoding.com/design-lld-splitwise-application-machine-coding) | Frequently asked in all companies | | | Design AWS Lambda | [Solution-1](https://lldcoding.com/design-lld-aws-lambda-machine-coding) | Frequently asked in all companies | | | Design Game Engine | [Solution-1](https://lldcoding.com/design-lld-game-engine-like-unreal-machine-coding) | Frequently asked in all companies | | | Design Newsletter Service | [Solution-1](https://lldcoding.com/design-lld-newsletter-service-machine-coding) | Frequently asked in all companies | | | Design Gmail | [Solution-1](https://lldcoding.com/design-lld-gmail-machine-coding) | Frequently asked in all companies | | | Design Whatsapp | [Solution-1](https://lldcoding.com/design-lld-whatsapp-messenger-machine-coding) | Frequently asked in all companies | | | Design Event Calender | [Solution-1](https://lldcoding.com/design-lld-event-calendar-machine-coding) | Frequently asked in all companies | | | Design Tinder | [Solution-1](https://lldcoding.com/design-lld-tinder-dating-app-machine-coding) | Frequently asked in all companies | | | Design Zoom | [Solution-1](https://lldcoding.com/design-lld-a-video-conferencing-application-like-zoom-machine-coding) | Frequently asked in all companies | | | Design Google Doc | [Solution-1](https://lldcoding.com/design-lld-a-real-time-collaborative-document-editing-platform-like-google-docs-machine-coding) | Frequently asked in all companies | | | Design Mentorship Platform | [Solution-1](https://lldcoding.com/design-lld-mentorship-platform-like-preplaced-machine-coding) | Frequently asked in all companies | | | Design CryptoCurrency Exchange | [Solution-1](https://lldcoding.com/design-lld-a-cryptocurrency-exchange-platform-machine-coding) | Frequently asked in all companies | | | Design Food Delivery App | [Solution-1](https://lldcoding.com/design-lld-a-system-for-online-food-ordering-and-delivery-like-zomato-machine-coding) | Frequently asked in all companies | | | Design Codepair Platform | [Solution-1](https://lldcoding.com/design-lld-pair-programming-platform-like-hackerrank-codepair-machine-coding) | Frequently asked in all companies | | | Design Chat System | [Solution-1](https://lldcoding.com/design-lld-a-real-time-chat-system-with-support-for-millions-of-concurrent-users-machine-coding) | Frequently asked in all companies | | | Design Dropbox | [Solution-1](https://lldcoding.com/design-lld-a-file-sharing-system-like-dropbox-machine-coding) | Frequently asked in all companies | | | Design Music Recognition System | [Solution-1](https://lldcoding.com/design-lld-a-music-recognition-system-using-audio-fingerprinting-machine-coding) | Frequently asked in all companies | | | Design Spotify | [Solution-1](https://lldcoding.com/implement-a-music-streaming-service-like-spotify-machine-coding) | Frequently asked in all companies | | | Design Bittorrent | [Solution-1](https://lldcoding.com/design-lld-a-peer-to-peer-file-sharing-system-like-bittorrent-machine-coding) | Frequently asked in all companies | | | Design Distributed Search | [Solution-1](https://lldcoding.com/design-lld-distributed-search-engine-machine-coding) | Frequently asked in all companies | | | Design Google Maps | [Solution-1](https://lldcoding.com/design-lld-google-maps-machine-coding) | Frequently asked in all companies | | | Design Twitter/X | [Solution-1](https://lldcoding.com/design-lld-twitter-machine-coding) | Frequently asked in all companies | | | Design Blockchain | [Solution-1](https://lldcoding.com/design-lld-blockchain-machine-coding) | Frequently asked in all companies | | | Design Video Streaming | [Solution-1](https://lldcoding.com/design-lld-video-streaming-platform-machine-coding) | Frequently asked in all companies | | | Design Spotify | [Solution-1](https://lldcoding.com/implement-a-music-streaming-service-like-spotify-machine-coding) | Frequently asked in all companies | | | Design Bittorrent | [Solution-1](https://lldcoding.com/design-lld-a-peer-to-peer-file-sharing-system-like-bittorrent-machine-coding) | Frequently asked in all companies | | <br /> --- ### Contribute --- Contributions welcome! If you found this resource helpful, give it a 🌟 otherwise contribute to it and give it a ⭐️. ", Assign "at most 3 tags" to the expected json: {"id":"6535","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"