Question bank

System design interview questions

132 system design questions from the Practick bank, from URL shorteners and chat apps to payment systems and search. Each has the opening prompt, what the round really tests and the clarifying questions worth asking. Read one, then practise it out loud with someone who pushes back.

Book a free mock interview

Easy (5)

Design a shopping cart Easy
Design a parking payment system Easy
Design a book/movie review aggregator Easy
Design a URL shortener (TinyURL/Bit.ly) Easy
Design Pastebin Easy

Medium (58)

Design Instagram (photo sharing + feed) Medium
Design Facebook News Feed (fan-out) Medium
Design a live commenting system (FB/IG Live) Medium
Design Quora / Reddit (Q&A, comments) Medium
Design a commenting system like Disqus Medium
Design Snapchat (ephemeral content) Medium
Design a like/dislike counter at YouTube scale Medium
Design WhatsApp / chat messaging system Medium
Design Slack Medium
Design Discord / Messenger-style messaging service Medium
Design a notification system (push/SMS/email) Medium
Design Amazon Prime Video home page Medium
Design a photo-sharing platform (Google Photos/Flickr) Medium
Design a live sports scores site (ESPN/Cricbuzz) Medium
Design a heat map for Uber drivers Medium
Design a toll booth system for Ola cabs Medium
Design Strava (activity/geo tracking) Medium
Design an inventory system Medium
Design Amazon pickup lockers Medium
Design a coupon / promo code system Medium
Design a subscription delivery system (BigBasket-style) Medium
Design an order-event processing system (out-of-order/dedup) Medium
Design a Favorites feature for a food app Medium
Design search autocomplete / typeahead Medium
Design a web crawler Medium
Design Twitter search Medium
Design a news aggregator Medium
Design a rate limiter Medium
Design a distributed cache Medium
Design consistent hashing Medium
Design a unique ID generator (Snowflake) Medium
Design a pub/sub messaging system Medium
Design a job / task scheduler Medium
Design a distributed logging system Medium
Design an in-memory database Medium
Design a distributed LRU cache Medium
Design a webhook delivery system Medium
Design an API gateway Medium
Design a load balancer Medium
Design a circuit breaker Medium
Design a GPU job management / scheduling system Medium
Design Ticketmaster (event ticketing) Medium
Design a restaurant table booking system Medium
Design Google Calendar / meeting scheduler Medium
Design a conference room booking system Medium
Design an online auction like eBay Medium
Design a coding judge platform (LeetCode/HackerRank) Medium
Design an online examination portal Medium
Design a performance appraisal system Medium
Design a real-time gaming leaderboard Medium
Design a sensor data ingestion system (millions of devices) Medium
Design redundancy for a cloud compute cluster Medium
Design an interview scheduling system Medium
Design Truecaller / caller-ID system Medium
Design a price tracking service (CamelCamelCamel) Medium
Design a website blocker backend Medium
Design a hospital management system Medium
Design an attendance management system Medium

Hard (69)

System design mock interviews · DSA interview questions · Free mock interview practice · Browse interviewers · Sign in