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Number of Islands
DSA25 min
Design a URL shortener
System Design40 min
Binary tree traversals
Revise15 min
"Tell me about a conflict"
Behavioral10 min
Trending questions
Coming soon
Design a news feed ranking system
Meta·Hard·142 recent
Minimum Window Substring
Google·Hard·128 recent
Design an image feed ranking system
Pinterest·Hard·121 recent
Design an idempotent payments API
Stripe·Hard·119 recent
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Razorpay·Hard·108 recent
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Netflix·Hard·97 recent
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Uber·Hard·91 recent
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Swiggy·Medium·88 recent
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Airbnb·Hard·84 recent
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Zomato·Hard·81 recent
Design a live order-tracking system
DoorDash·Medium·78 recent
Design an order-matching engine
Zerodha·Hard·74 recent
Trapping Rain Water
Coinbase·Hard·72 recent
Design a UPI transaction system
PhonePe·Hard·69 recent
Design a metrics ingestion pipeline
Datadog·Hard·66 recent
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Paytm·Hard·63 recent
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Cloudflare·Medium·61 recent
Merge k Sorted Lists
Snowflake·Hard·57 recent
Design a credit-card bill reminder
HCL·Medium·54 recent
Design a comment ranking system
Reddit·Medium·52 recent
Design real-time multiplayer cursors
Figma·Hard·48 recent
Design a file sync service
Dropbox·Hard·41 recent
LRU Cache
Atlassian·Medium·38 recent
Design a multi-tenant CRM schema
Zoho·Medium·36 recent
Design a music recommendation feed
Spotify·Medium·35 recent
Reverse a Linked List
Infosys·Easy·33 recent
Design a code search index
GitHub·Hard·31 recent
Design an inventory availability system
Instacart·Medium·27 recent
Detect a cycle in a linked list
TCS·Easy·26 recent
Course Schedule (topological sort)
Nvidia·Medium·24 recent
Longest Substring Without Repeating
HackerRank·Medium·22 recent
Design a data lineage graph
Palantir·Hard·21 recent
Two Sum
Wipro·Easy·19 recent
Design a live-class streaming system
Unacademy·Hard·18 recent
Design an API request history store
Postman·Medium·16 recent
Design a hotel booking system
OYO·Medium·15 recent
Design a distributed job scheduler
Databricks·Hard·13 recent
Design a news feed ranking system
Meta·Hard·142 recent
Minimum Window Substring
Google·Hard·128 recent
Design an image feed ranking system
Pinterest·Hard·121 recent
Design an idempotent payments API
Stripe·Hard·119 recent
Design a payment reconciliation service
Razorpay·Hard·108 recent
Design a video streaming CDN
Netflix·Hard·97 recent
Design a ride-matching service
Uber·Hard·91 recent
Design a delivery ETA service
Swiggy·Medium·88 recent
Design a booking availability service
Airbnb·Hard·84 recent
Design a restaurant search & ranking
Zomato·Hard·81 recent
Design a live order-tracking system
DoorDash·Medium·78 recent
Design an order-matching engine
Zerodha·Hard·74 recent
Trapping Rain Water
Coinbase·Hard·72 recent
Design a UPI transaction system
PhonePe·Hard·69 recent
Design a metrics ingestion pipeline
Datadog·Hard·66 recent
Design a digital wallet
Paytm·Hard·63 recent
Design a distributed rate limiter
Cloudflare·Medium·61 recent
Merge k Sorted Lists
Snowflake·Hard·57 recent
Design a credit-card bill reminder
HCL·Medium·54 recent
Design a comment ranking system
Reddit·Medium·52 recent
Design real-time multiplayer cursors
Figma·Hard·48 recent
Design a file sync service
Dropbox·Hard·41 recent
LRU Cache
Atlassian·Medium·38 recent
Design a multi-tenant CRM schema
Zoho·Medium·36 recent
Design a music recommendation feed
Spotify·Medium·35 recent
Reverse a Linked List
Infosys·Easy·33 recent
Design a code search index
GitHub·Hard·31 recent
Design an inventory availability system
Instacart·Medium·27 recent
Detect a cycle in a linked list
TCS·Easy·26 recent
Course Schedule (topological sort)
Nvidia·Medium·24 recent
Longest Substring Without Repeating
HackerRank·Medium·22 recent
Design a data lineage graph
Palantir·Hard·21 recent
Two Sum
Wipro·Easy·19 recent
Design a live-class streaming system
Unacademy·Hard·18 recent
Design an API request history store
Postman·Medium·16 recent
Design a hotel booking system
OYO·Medium·15 recent
Design a distributed job scheduler
Databricks·Hard·13 recent