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Twitter

High-Growth Unicorns

100 interview questions from past Twitter candidates

How to use this company question set

Start with the highest-frequency questions to build momentum, then move into category gaps where your confidence is lower. If you are early in prep, pair this page with the full Twitter interview guide for process expectations and timeline context.

For stronger retention, rotate through coding patterns and the interview roadmap while tracking recurring misses in this company-specific list.

Company question insights and frequency breakdown

Total Questions

100

Very Common

24

Categories

10

Reports

778

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Question Categories

Arrays & Hashing (28)
Fundamentals (18)
Databases (15)
Trees & Graphs (10)
Dynamic Programming (9)
Stacks & Queues (8)
Sorting & Searching (4)
Message Queues (4)
Linked Lists (2)
Caching (2)

Very Common Questions
24

These questions are frequently asked at this company

Netflix: Multi-Region Failover

Fundamentals
hard
16 reports
mcq

Palantir: Federated Data Architecture

Fundamentals
hard
16 reports
mcq

Coinbase: Transaction Processing Order

Message Queues
hard
16 reports
mcq

Databricks: Incremental Processing

Fundamentals
medium
16 reports
mcq

Meta: Photo Upload at Scale

Fundamentals
medium
16 reports
mcq

Robinhood: Payment for Order Flow

Fundamentals
medium
16 reports
mcq

Meta: Instagram Story Architecture

Fundamentals
medium
16 reports
mcq

Salesforce: Multi-Tenant Architecture Basics

Fundamentals
easy
16 reports
mcq

Apple: Memory Constraints

Fundamentals
hard
16 reports
mcq

Event Sourcing

Fundamentals
hard
16 reports
mcq

Databricks: Unity Catalog

Fundamentals
hard
16 reports
mcq

Salesforce: Shared Nothing vs Shared Everything

Fundamentals
hard
16 reports
mcq

Coinbase: Portfolio Tracking Dashboard

Fundamentals
medium
16 reports
mcq

Netflix: Event-Driven Architecture

Message Queues
medium
16 reports
mcq

Stripe: Idempotency Keys

Fundamentals
medium
16 reports
mcq

Bloomberg: Pub-Sub Market Data Architecture

Fundamentals
medium
16 reports
mcq

Cache Invalidation: Write-Through vs Write-Behind

Caching
hard
16 reports
mcq

Load Balancing Algorithms

Fundamentals
medium
16 reports
mcq

DoorDash: Notification System

Message Queues
medium
16 reports
mcq

Design a Key-Value Store

Fundamentals
medium
16 reports
system design

Coinbase: Crypto Exchange Order Book

Fundamentals
hard
16 reports
mcq

DoorDash: Dynamic Pricing (Surge)

Fundamentals
hard
16 reports
mcq

Spotify: Playlist Follow Notifications

Message Queues
medium
16 reports
mcq

Design a caching strategy for an e-commerce product catalog

Caching
medium
16 reports
verbal

Common Questions
15

Regularly reported by candidates

DoorDash: Search and Discovery

Databases
medium
10 reports
mcq

Coinbase: Transaction History at Scale

Databases
medium
10 reports
mcq

Coinbase: Wallet Balance Tracking

Databases
hard
10 reports
mcq

Database: ACID vs BASE

Databases
hard
10 reports
mcq

Consistency Model for Messaging Systems

Databases
hard
10 reports
mcq

What does ROW_NUMBER() OVER (PARTITION BY dept ORDER BY salary DESC) do?

Databases
medium
10 reports
mcq

Palantir: Ontology-Driven Data Integration

Databases
medium
10 reports
mcq

Databricks: Data Skipping

Databases
medium
10 reports
mcq

Debug a database deadlock issue

Databases
hard
10 reports
verbal

Twitter Tweet Storage: Database Choice

Databases
medium
10 reports
mcq

Databricks: Data Lakehouse Architecture

Databases
easy
10 reports
mcq

Databricks: Multi-Cloud Data Sharing

Databases
hard
10 reports
mcq

Database: Read Replicas

Databases
medium
10 reports
mcq

Month-over-Month Revenue Growth

Databases
medium
10 reports
coding

Database Replication

Databases
medium
10 reports
mcq

Occasional Questions
61

Reported from time to time

BFS Data Structure

Trees & Graphs
easy
4 reports
mcq

Databricks: MERGE Operation

Arrays & Hashing
medium
4 reports
mcq

Bloomberg: Order Book Management

Stacks & Queues
medium
4 reports
mcq

Meta: Subarray Product Problem

Arrays & Hashing
medium
4 reports
mcq

Databricks: Consistent Hashing for Partitioning

Arrays & Hashing
hard
4 reports
mcq

Greedy: When It Fails

Sorting & Searching
medium
4 reports
mcq

House Robber II

Arrays & Hashing
medium
4 reports
coding

Climbing Stairs

Dynamic Programming
easy
4 reports
coding

Two Pointers: When to Use

Arrays & Hashing
easy
4 reports
mcq

Evaluate Reverse Polish Notation

Stacks & Queues
medium
4 reports
coding

Merge Intervals

Arrays & Hashing
medium
4 reports
coding

Uber: Shortest Path with Traffic

Trees & Graphs
hard
4 reports
mcq

Remove Duplicates from Sorted List

Linked Lists
easy
4 reports
coding

Robinhood: Decimal Precision

Arrays & Hashing
medium
4 reports
mcq

DP State Reduction

Dynamic Programming
hard
4 reports
mcq

Kth Largest Element in an Array

Arrays & Hashing
medium
4 reports
coding

Google: DP vs Greedy

Dynamic Programming
medium
4 reports
mcq

Bipartite Graph Chromatic Number

Trees & Graphs
hard
4 reports
mcq

LinkedIn: Feed Generation Strategy

Arrays & Hashing
hard
4 reports
mcq

Spotify: Play Queue Management

Stacks & Queues
medium
4 reports
mcq

Tesla: Battery Pack Cell Configuration

Dynamic Programming
hard
4 reports
mcq

Intervals: Merge Overlapping

Sorting & Searching
medium
4 reports
mcq

Encode and Decode Strings

Arrays & Hashing
medium
4 reports
coding

Heapsort Complexity

Stacks & Queues
medium
4 reports
mcq

K-Way Merge with Heap

Stacks & Queues
medium
4 reports
mcq

TikTok: Bloom Filter for Seen Content

Arrays & Hashing
hard
4 reports
mcq

Coinbase: Batch Transaction Processing

Arrays & Hashing
hard
4 reports
mcq

Spotify: Skip List for Playlist Index

Linked Lists
hard
4 reports
mcq

Sliding Window: Problem Recognition

Arrays & Hashing
easy
4 reports
mcq

Product of Array Except Self

Arrays & Hashing
medium
4 reports
coding

DP: Memoization vs Tabulation

Dynamic Programming
medium
4 reports
mcq

Meta: Two Pointer Pattern Recognition

Arrays & Hashing
medium
4 reports
mcq

Microsoft: Tree Traversal Order

Trees & Graphs
medium
4 reports
mcq

Coinbase: Atomic Transaction Processing

Arrays & Hashing
medium
4 reports
mcq

DP: 0/1 Knapsack Pattern

Dynamic Programming
medium
4 reports
mcq

Airbnb: Availability Calendar

Sorting & Searching
medium
4 reports
mcq

Container With Most Water

Arrays & Hashing
medium
4 reports
coding

Graph: Cycle Detection

Trees & Graphs
medium
4 reports
mcq

Coin Change

Dynamic Programming
medium
4 reports
coding

Heap Insert Complexity

Stacks & Queues
medium
4 reports
mcq

Heapify Time Complexity

Stacks & Queues
hard
4 reports
mcq

BFS vs DFS: When to Use BFS

Trees & Graphs
easy
4 reports
mcq

Merge Sorted Array

Arrays & Hashing
easy
4 reports
coding

Tree Traversal: Inorder Property

Trees & Graphs
medium
4 reports
mcq

Sort Colors (Dutch National Flag)

Sorting & Searching
medium
4 reports
mcq

Coinbase: Order Book Data Structure

Stacks & Queues
hard
4 reports
mcq

Number of Islands

Trees & Graphs
medium
4 reports
coding

Edit Distance Problem

Dynamic Programming
hard
4 reports
mcq

Word Break

Dynamic Programming
medium
4 reports
coding

DoorDash: Order-Dasher Matching

Arrays & Hashing
hard
4 reports
mcq

Number of 1 Bits

Arrays & Hashing
easy
4 reports
coding

Hash Map: Frequency Counting

Arrays & Hashing
medium
4 reports
mcq

Maximum Subarray Sum

Arrays & Hashing
medium
4 reports
coding

DoorDash: LRU Cache for Restaurant Data

Arrays & Hashing
medium
4 reports
mcq

Spotify: Artist Collaboration Graph

Trees & Graphs
hard
4 reports
mcq

Coinbase: Input Sanitization for Financial Data

Arrays & Hashing
medium
4 reports
mcq

DoorDash: Shortest Path for Delivery

Trees & Graphs
hard
4 reports
mcq

DoorDash: Assignment at Scale

Arrays & Hashing
hard
4 reports
mcq

Spiral Matrix

Arrays & Hashing
medium
4 reports
coding

Maximum Subarray

Arrays & Hashing
medium
4 reports
coding

Pow(x, n)

Arrays & Hashing
medium
4 reports
coding

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