Meta Interview Questions and Guide

Speed matters — two problems per coding round. Product design rounds focus on APIs and data flow for user-facing features.

The Meta interview loop

1. Recruiter screen
2. Technical screen: 2 coding problems in 45 min
3. Onsite: 2 coding, 1 system or product design, 1 behavioral

Meta interview questions

• Design a URL Shortener
• Design Ticketmaster
• Design WhatsApp
• Design a News Feed
• Design Top-K Trending Videos
• Design YouTube
• Design an Ad Click Aggregator
• Design LeetCode
• Design Meta Post Privacy
• Design Zoom (Video Conferencing)
• Design Instagram
• Design Twitter Search
• Design Reddit
• Design TikTok (For You Feed)
• Design Tinder
• Design Facebook Live Comments
• Design Strava
• Design Google News
• Design a Distributed File System
• Design Distributed Counters
• Design a Real-Time Leaderboard
• Design a Remote Devbox
• Design ML Model Distribution
• Design Sora (Text-to-Video)
• Minimum Window Substring
• Container With Most Water
• 3Sum
• Product of Array Except Self
• Sort Colors (Dutch National Flag)
• Find All Anagrams in a String
• Longest Palindromic Substring
• Best Time to Buy and Sell Stock
• Valid Palindrome
• Valid Palindrome II
• Valid Word Abbreviation
• Merge Sorted Array
• Move Zeroes
• Longest Common Prefix
• Rotate Image
• Spiral Matrix
• Next Permutation
• Set Matrix Zeroes
• Longest Repeating Character Replacement
• Max Consecutive Ones III
• Minimum Size Subarray Sum
• First Missing Positive
• Remove Duplicates from Sorted Array
• Rotate Array
• Squares of a Sorted Array
• Two Sum II - Input Array Is Sorted
• Zigzag Conversion
• 4Sum
• 3Sum Closest
• Fruit Into Baskets
• Permutation in String
• String Compression
• Reverse Words in a String
• Subarray Product Less Than K
• Game of Life
• Majority Element II
• Remove Element
• Merge Strings Alternately
• Maximum Average Subarray I
• Is Subsequence
• Remove Duplicates from Sorted Array II
• Diagonal Traverse
• Increasing Triplet Subsequence
• Frequency of the Most Frequent Element
• Number of Substrings Containing All Three Characters
• Rotate String
• Find Pivot Index
• Rearrange Array Elements by Sign
• Can Make Arithmetic Progression From Sequence
• Find Missing and Repeated Values
• Find All Numbers Disappeared in an Array
• Third Maximum Number
• Maximum Sum of Distinct Subarrays With Length K
• Maximum Number of Vowels in a Substring of Given Length
• Longest Substring with At Most K Distinct Characters
• Sort an Array
• Toeplitz Matrix
• Range Sum Query - Immutable
• Range Sum Query 2D - Immutable
• Subarray Sum Equals K
• Implement an LRU Cache
• Two Sum
• Group Anagrams
• Longest Consecutive Sequence
• Contiguous Array (Equal 0s and 1s)
• Valid Anagram
• Isomorphic Strings
• Valid Sudoku
• Continuous Subarray Sum
• Subarray Sums Divisible by K
• Happy Number
• Contains Duplicate
• Ransom Note
• Count Number of Nice Subarrays
• Intersection of Two Arrays
• Repeated DNA Sequences
• Group Shifted Strings
• Longest Palindrome
• Unique Number of Occurrences
• Brick Wall
• K-diff Pairs in an Array
• Max Number of K-Sum Pairs
• Jewels and Stones
• Sort Array by Increasing Frequency
• Reverse a Linked List
• Reverse a Sublist
• Merge K Sorted Lists
• Remove the Nth Node From the End
• Reorder List
• Palindrome Linked List
• Add Two Numbers
• Swap Nodes in Pairs
• Rotate List
• Odd Even Linked List
• Remove Duplicates from Sorted List II
• Sort List
• Reverse Nodes in k-Group
• Remove Duplicates from Sorted List
• Remove Linked List Elements
• Partition List
• Delete the Middle Node of a Linked List
• Add Two Numbers II
• Insertion Sort List
• Swapping Nodes in a Linked List
• Maximum Twin Sum of a Linked List
• Remove Zero Sum Consecutive Nodes from Linked List
• Double a Number Represented as a Linked List
• Daily Temperatures
• Valid Parentheses
• Basic Calculator II
• Minimum Remove to Make Valid Parentheses
• Decode String
• Asteroid Collision
• Simplify Path
• Basic Calculator
• Longest Valid Parentheses
• Next Greater Element I
• Final Prices With a Special Discount in a Shop
• Remove All Adjacent Duplicates in String
• Remove All Adjacent Duplicates in String II
• Minimum Add to Make Parentheses Valid
• Maximal Rectangle
• Exclusive Time of Functions
• Car Fleet
• Buildings With an Ocean View
• Backspace String Compare
• Baseball Game
• Basic Calculator III
• Max Stack
• Sum of Subarray Ranges
• Maximum Nesting Depth of the Parentheses
• Maximum Frequency Stack
• Score of Parentheses
• Binary Tree Level Order Traversal
• Shortest Path in Binary Matrix
• Walls and Gates
• Longest Subarray With Absolute Diff ≤ Limit
• Moving Average from Data Stream
• Find the Winner of the Circular Game
• Jump Game VII
• Shortest Path in a Grid with Obstacles Elimination
• Number of Students Unable to Eat Lunch
• Nearest Exit from Entrance in Maze
• Shortest Distance from All Buildings
• Minimum Genetic Mutation
• Find the Safest Path in a Grid
• Continuous Subarrays
• Count Subarrays With Fixed Bounds
• Top K Frequent Elements
• Kth Largest Element in an Array
• K Closest Points to Origin
• Kth Largest Element in a Stream
• Task Scheduler
• Top K Frequent Words
• Sort Characters by Frequency
• Kth Smallest Element in a Sorted Matrix
• Furthest Building You Can Reach
• Meeting Rooms III
• Minimum Number of Refueling Stops
• Design Twitter
• Ugly Number II
• Minimum Cost to Hire K Workers
• Maximal Score After Applying K Operations
• Search in Rotated Sorted Array
• First and Last Position in a Sorted Array
• Find Minimum in Rotated Sorted Array
• Find a Peak Element
• Split Array Largest Sum
• Median of Two Sorted Arrays
• Search a 2D Matrix
• Sqrt(x)
• Single Element in a Sorted Array
• Kth Missing Positive Number
• Find K Closest Elements
• Minimum Number of Days to Make m Bouquets
• Search a 2D Matrix II
• Peak Index in a Mountain Array
• Find the Smallest Divisor Given a Threshold
• Magnetic Force Between Two Balls
• Find a Peak Element II
• Arranging Coins
• Find K-th Smallest Pair Distance
• Successful Pairs of Spells and Potions
• Minimum Speed to Arrive on Time
• Lowest Common Ancestor of a Binary Tree
• Binary Tree Right Side View
• Diameter of a Binary Tree
• Path Sum II
• Binary Tree Maximum Path Sum
• Same Tree
• Symmetric Tree
• Subtree of Another Tree
• Binary Tree Zigzag Level Order Traversal
• Binary Tree Vertical Order Traversal
• All Nodes Distance K in Binary Tree
• Sum Root to Leaf Numbers
• Path Sum III
• Maximum Width of Binary Tree
• Flatten Binary Tree to Linked List
• Boundary of Binary Tree
• Step-By-Step Directions From a Binary Tree Node to Another
• Vertical Order Traversal of a Binary Tree
• Count Good Nodes in Binary Tree
• Find Leaves of Binary Tree
• Binary Tree Cameras
• Binary Tree Paths
• Minimum Depth of Binary Tree
• Count Complete Tree Nodes
• Count Nodes Equal to Average of Subtree
• Cousins in Binary Tree
• Maximum Difference Between Node and Ancestor
• Longest ZigZag Path in a Binary Tree
• Binary Tree Preorder Traversal
• Sum of Left Leaves
• Merge Two Binary Trees
• Find Largest Value in Each Tree Row
• Check Completeness of a Binary Tree
• Construct Binary Tree from Inorder and Postorder Traversal
• Maximum Level Sum of a Binary Tree
• Binary Tree Tilt
• Validate a Binary Search Tree
• Kth Smallest Element in a BST
• Lowest Common Ancestor in a BST
• Range Sum of a BST
• Two Sum IV - Input is a BST
• Closest Binary Search Tree Value
• Trim a Binary Search Tree
• Inorder Successor in BST
• Convert Sorted List to Binary Search Tree
• Convert BST to Greater Tree
• Minimum Absolute Difference in BST
• Closest Binary Search Tree Value II
• Balance a Binary Search Tree
• Unique Binary Search Trees
• Construct Binary Search Tree from Preorder Traversal
• Increasing Order Search Tree
• All Elements in Two Binary Search Trees
• Largest BST Subtree
• Count of Smaller Numbers After Self
• Two Sum BSTs
• Verify Preorder Sequence in Binary Search Tree
• Course Schedule (Ordering)
• Accounts Merge
• Graph Valid Tree
• Word Ladder
• Pacific Atlantic Water Flow
• Is Graph Bipartite?
• Course Schedule II
• Max Area of Island
• Flood Fill
• Surrounded Regions
• Number of Connected Components in an Undirected Graph
• Making A Large Island
• Reconstruct Itinerary
• Alien Dictionary
• Keys and Rooms
• Swim in Rising Water
• The Earliest Moment When Everyone Become Friends
• Number of Islands II
• Minimum Height Trees
• Find if Path Exists in Graph
• Find the Celebrity
• All Paths From Source to Target
• Critical Connections in a Network
• Shortest Bridge
• Reorder Routes to Make All Paths Lead to the City Zero
• Number of Operations to Make Network Connected
• Detonate the Maximum Bombs
• Find All Possible Recipes from Given Supplies
• Find the Town Judge
• Count Unreachable Pairs of Nodes in an Undirected Graph
• Word Break
• Decode Ways
• Partition Equal Subset Sum
• Target Sum
• Maximum Product Subarray
• Palindromic Substrings
• House Robber II
• Maximal Square
• Regular Expression Matching
• Longest Increasing Path in a Matrix
• Min Cost Climbing Stairs
• Pascal's Triangle
• Triangle
• Perfect Squares
• Predict the Winner
• Maximum Sum Circular Subarray
• Wildcard Matching
• Distinct Subsequences
• Russian Doll Envelopes
• Best Time to Buy and Sell Stock III
• Best Time to Buy and Sell Stock with Transaction Fee
• Combination Sum IV
• Number of Longest Increasing Subsequence
• Minimum Falling Path Sum
• Dungeon Game
• Integer Break
• Partition Array for Maximum Sum
• Minimum Cost to Cut a Stick
• Fibonacci Number
• Count Square Submatrices with All Ones
• Domino and Tromino Tiling
• Cherry Pickup
• Longest String Chain
• Maximum Sum of 3 Non-Overlapping Subarrays
• Generate Subsets and Permutations
• Permutations
• Combination Sum
• Word Search
• Generate Parentheses
• Letter Combinations of a Phone Number
• Subsets II
• Combination Sum II
• Permutations II
• Palindrome Partitioning
• Restore IP Addresses
• Word Break II
• Expression Add Operators
• Subsets
• Combination Sum III
• Letter Case Permutation
• Matchsticks to Square
• Remove Invalid Parentheses
• Word Ladder II
• Path with Maximum Gold
• Maximum Length of a Concatenated String with Unique Characters
• Generalized Abbreviation
• Unique Paths III
• N-Queens II
• Different Ways to Add Parentheses
• Jump Game
• Partition Labels
• Best Time to Buy and Sell Stock II
• Can Place Flowers
• Valid Parenthesis String
• Largest Number
• Boats to Save People
• Hand of Straights
• Maximum Swap
• Lemonade Change
• Assign Cookies
• Two City Scheduling
• Queue Reconstruction by Height
• Minimum Deletions to Make Character Frequencies Unique
• Maximum Units on a Truck
• Reduce Array Size to The Half
• Wiggle Subsequence
• Minimum Number of Taps to Open to Water a Garden
• Maximum Ice Cream Bars
• Merge Overlapping Intervals
• Minimum Meeting Rooms
• Insert Interval
• Meeting Rooms
• Non-overlapping Intervals
• Interval List Intersections
• Minimum Arrows to Burst Balloons
• Summary Ranges
• Data Stream as Disjoint Intervals
• Minimum Interval to Include Each Query
• Missing Ranges
• Count Days Without Meetings
• Divide Intervals Into Minimum Number of Groups
• Minimum Time Difference
• The Skyline Problem
• Remove Interval
• Design Add and Search Words (Wildcards)
• Map Sum Pairs
• Concatenated Words
• Stream of Characters
• Palindrome Pairs
• Prefix and Suffix Search
• Short Encoding of Words
• Sum of Prefix Scores of Strings
• Lexicographical Numbers
• Remove Sub-Folders from the Filesystem
• Index Pairs of a String
• Missing Number
• Sum of Two Integers Without + or -
• Add Binary
• Hamming Distance
• Single Number III
• Total Hamming Distance
• Divide Two Integers
• UTF-8 Validation
• Minimum Bit Flips to Convert Number
• Bitwise ORs of Subarrays
• Find Kth Bit in Nth Binary String
• Pow(x, n) — Fast Exponentiation
• Reservoir Sampling
• Palindrome Number
• Reverse Integer
• Roman to Integer
• Integer to Roman
• String to Integer (atoi)
• Multiply Strings
• Excel Sheet Column Title
• Fraction to Recurring Decimal
• Integer to English Words
• Angle Between Hands of a Clock
• Plus One
• Add Strings
• Fizz Buzz
• Count and Say
• Valid Number
• Sequential Digits
• Power of Three
• Ugly Number
• Sum of Square Numbers
• Rotate Function
• Count Good Numbers
• Excel Sheet Column Number
• Water and Jug Problem
• Find the Closest Palindrome
• Design a Notification Service
• Tell me about yourself
• Tell me about a conflict with a coworker
• Tell me about a time you failed
• Walk me through your most impactful project
• Tell me about critical feedback you received
• Why are you leaving your current role?
• What are you looking for in your next team?
• Tell me about a time you took ownership beyond your role
• Tell me about a problem you noticed that nobody else was addressing
• Tell me about a project you drove from idea to launch
• Tell me about delivering a project across multiple teams
• Tell me about a time you led without formal authority
• Tell me about a time you convinced others to adopt your idea
• Tell me about working with an underperforming teammate
• Tell me about a decision you made with incomplete information
• Tell me about a difficult technical trade-off you made
• Tell me about a time you had to change direction mid-project
• Tell me about a time you had to cut scope
• Tell me about a mistake that affected others
• Tell me about the hardest bug you've debugged
• Tell me about a time you had to learn something new quickly
• Tell me about a time you pushed back on a request
• Tell me about a time you made the case for paying down tech debt
• What questions do you have for me?
• Tell me about a time you took a calculated risk
• Tell me about raising the bar when hiring or developing people
• Tell me about a time you shipped fast and iterated
• Tell me about a time you kept going on a problem that seemed stuck
• Tell me about creating structure in a chaotic situation
• Tell me about a time you gave difficult feedback to a peer
• Tell me about a time you challenged a more senior colleague
• Build a Small App from a Spec with AI
• Add Tests to an Untested Module with AI
• Refactor a Legacy Module with AI
• Fix a Slow Endpoint with AI
• Review an AI-Generated Pull Request
• Build a Multi-Level In-Memory Store with AI
• Integrate a Paginated, Rate-Limited API with AI
• Analyze Logs with a Script and AI
• Fix a Concurrency Bug with AI
• Ship a Feature Behind a Flag with a Data Migration