Popular questions

Question 1

Design URL Shortener (like Bit.ly)

Answer 1

https://systemdesign.one/url-shortening-system-design/

Question 2

Design Pastebin

Answer 2

https://systemdesign.one/system-design-pastebin

Question 3

Design Rate Limiter

Answer 3

https://medium.com/geekculture/system-design-design-a-rate-limiter-81d200c9d392

Question 4

Design File Storage Service (like Dropbox)

Answer 4

https://www.hellointerview.com/learn/system-design/problem-breakdowns/dropbox

Question 5

Design Notification System (email/SMS push)

Answer 5

https://www.designgurus.io/course-play/grokking-system-design-interview-ii/doc/designing-a-notification-system

Question 6

Design a Caching System (e.g., using Redis)

Answer 6

https://www.geeksforgeeks.org/redis-cache/

Question 7

Design a Key-Value Store (like Redis)

Answer 7

https://nikasakana.medium.com/how-to-design-a-distributed-key-value-store-cfd83248541b

Question 8

Design a Message Queue (like Kafka-lite)

Answer 8

https://www.geeksforgeeks.org/message-queues-system-design/

Question 9

Design Instagram

Answer 9

https://www.designgurus.io/course-play/grokking-the-system-design-interview/doc/designing-instagram

Question 10

Design Twitter

Answer 10

https://www.geeksforgeeks.org/design-twitter-a-system-design-interview-question/

Question 11

Design WhatsApp / Chat System

Answer 11

https://www.geeksforgeeks.org/designing-whatsapp-messenger-system-design/

Question 12

Design YouTube

Answer 12

https://www.hellointerview.com/learn/system-design/problem-breakdowns/youtube

Question 13

Design Web Crawler

Answer 13

https://www.hellointerview.com/learn/system-design/problem-breakdowns/web-crawler

Question 14

Design a Search Autocomplete Service

Answer 14

https://systemdesignprep.com/autocomplete

Question 15

Design a News Feed System

Answer 15

https://www.hellointerview.com/learn/system-design/problem-breakdowns/fb-news-feed

Question 16

Design a Ride-Sharing System (like Uber)

Answer 16

https://www.geeksforgeeks.org/system-design-of-uber-app-uber-system-architecture/

Question 17

Design an API Rate Limiter for Distributed Systems

Answer 17

https://www.geeksforgeeks.org/how-to-design-a-rate-limiter-api-learn-system-design/

Question 18

Design Google Docs / Collaborative Editor

Answer 18

https://systemdesignschool.io/problems/google-doc/solution

Question 19

Design Netflix / Video Streaming Service

Answer 19

https://www.geeksforgeeks.org/system-design-netflix-a-complete-architecture/

Question 20

Design Amazon (E-commerce System)

Answer 20

https://medium.com/@vaibhavkansagara/high-level-system-design-for-amazon-1aa18f3efd15

Question 21

Design a Scalable Event-Driven System

Answer 21

https://www.geeksforgeeks.org/event-driven-architecture-system-design/

Question 22

Design Facebook Messenger

Answer 22

https://www.geeksforgeeks.org/desiging-facebook-messenger-system-design-interview/

Question 23

Design Distributed File System (like HDFS)

Answer 23

https://www.geeksforgeeks.org/introduction-to-hadoop-distributed-file-systemhdfs/

Question 24

Design a Global CDN (like Cloudflare/Akamai)

Answer 24

https://www.geeksforgeeks.org/designing-content-delivery-network-cdn-system-design/

Question 25

Design an Online Multiplayer Game Backend

Answer 25

https://www.geeksforgeeks.org/how-to-design-a-database-for-multiplayer-online-games/

Question 26

Design a Metrics Monitoring System (like Prometheus)

Answer 26

https://medium.com/@tahir.rauf/system-design-metrics-monitoring-alerting-system-844a466e32c5

Question 27

Design a Log Aggregation System (like ELK stack)

Answer 27

https://www.geeksforgeeks.org/centralized-logging-systems-system-design/

Question 28

Design a Real-Time Bidding System (like for ads)

Answer 28

https://medium.com/@shiva.kutti.kumar/system-design-for-a-online-bidding-system-adf417f39f44

Question 29

Design a Booking System (Hotels or Flights)

Answer 29

https://www.geeksforgeeks.org/design-online-hotel-booking-system-like-oyo-rooms/