Design Interview Questions

Master 20 design problems frequently asked in technical interviews. These questions test your understanding of designconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard

Implement Queue using Stacks

Asked at TikTok

Stack Design Queue

Rank

#716HardFrequency: 100%

Max Stack

Asked at LinkedIn

Linked List Stack Design Doubly-Linked List Ordered Set

Rank

#817EasyFrequency: 100%

Design HashMap

Asked at DoorDash

Array Hash Table Linked List Design Hash Function

Rank

#146MediumFrequency: 88%

LRU Cache

Asked at Microsoft

Hash Table Linked List Design Doubly-Linked List

Rank

#432HardFrequency: 82%

All O`one Data Structure

Asked at Infosys

Hash Table Linked List Design Doubly-Linked List

Rank

#348MediumFrequency: 81%

Design Tic-Tac-Toe

Asked at PayPal

Array Hash Table Design Matrix Simulation

Rank

#362MediumFrequency: 79%

Design Hit Counter

Asked at Uber

Array Binary Search Design Queue Data Stream

Rank

#380MediumFrequency: 79%

Insert Delete GetRandom O(1)

Asked at Oracle

Array Hash Table Math Design Randomized

Rank

#1713MediumFrequency: 76%

Dot Product of Two Sparse Vectors

Asked at Meta

Array Hash Table Two Pointers Design

Rank

#173MediumFrequency: 75%

Binary Search Tree Iterator

Asked at Salesforce

Stack Tree Design Binary Search Tree Binary Tree Iterator

#10

Rank

#346EasyFrequency: 74%

Moving Average from Data Stream

Asked at Infosys

Array Design Queue Data Stream

#11

Rank

#3710HardFrequency: 72%

Design an Array Statistics Tracker

Asked at Amazon

Hash Table Binary Search Design Queue Heap (Priority Queue)Data Stream Ordered Set

#12

Rank

#381HardFrequency: 72%

Insert Delete GetRandom O(1) - Duplicates allowed

Asked at LinkedIn

Array Hash Table Math Design Randomized

#13

Rank

#353MediumFrequency: 67%

Design Snake Game

Asked at Apple

Array Hash Table Design Queue Simulation

#14

Rank

#244MediumFrequency: 63%

Shortest Word Distance II

Asked at LinkedIn

Array Hash Table Two Pointers String Design

#15

Rank

#460HardFrequency: 60%

LFU Cache

Asked at Amazon

Hash Table Linked List Design Doubly-Linked List

#16

Rank

#1775EasyFrequency: 57%

Design an Ordered Stream

Asked at Flipkart

Array Hash Table Design Data Stream

#17

Rank

#155MediumFrequency: 55%

Min Stack

Asked at Microsoft

Stack Design

#18

Rank

#359EasyFrequency: 51%

Logger Rate Limiter

Asked at Flipkart

Hash Table Design Data Stream

#19

Rank

#295HardFrequency: 48%

Find Median from Data Stream

Asked at Google

Two Pointers Design Sorting Heap (Priority Queue)Data Stream

#20

Rank

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Design Interview Questions

Master 20 design problems frequently asked in technical interviews. These questions test your understanding of designconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard