Real Coding & ML Interview Questions

3,618 reported questions, newest reports first. Browse by company or by topic.

• Design Post Search with Keyword Exclusion and Frequency Ranking
  LinkedInSystem Design for MLDifficulty 4/5Last asked Oct 17, 2026
• Ride Request Demand Prediction by Geohash and Premium Multiplier
  LyftSystem Design for MLDifficulty 4/5Last asked Oct 17, 2026
• Fault-Tolerant Work Queue (Leases, Retries, Dead-Letter)
  OpenAICoding & Leetcode-style QuestionsDifficulty 4/5Last asked Oct 16, 2026
• Tree Node Deletion → Max Height
  SnowflakeCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 16, 2026
• Scale Game of Life for Large Matrix
  Applied IntuitionCoding & Leetcode-style QuestionsDifficulty 4/5Last asked Oct 16, 2026
• Decode a Run-Length String With Optional Counts
  AppleCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 16, 2026
• Behavioral: A Decision Made With Limited Data
  AmazonBehavioralDifficulty 3/5Last asked Oct 16, 2026
• Spreadsheet with Integer and Formula Cells + Circular Dependency Detection
  HarveyCoding & Leetcode-style QuestionsDifficulty 4/5Last asked Oct 16, 2026
• Design a Shopping Cart Service With Inventory Consistency
  AmazonSystem Design for MLDifficulty 4/5Last asked Oct 16, 2026
• Behavioral: A Project Delivered With Minimal Manual Effort (Spec-Driven Development)
  AmazonBehavioralDifficulty 3/5Last asked Oct 16, 2026
• Longest Suffix-Prefix Overlap of Two Strings
  CrestaCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 16, 2026
• Text Editor with Cursor Movement
  DatologyAICoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 16, 2026
• HTTP Router with Path Parameters
  GoogleCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 16, 2026
• Design a Distributed Blob Cache With a Separate Metadata Index
  AppleSystem Design for MLDifficulty 4/5Last asked Oct 16, 2026
• Match-3 Grid: Find Matches, Clear and Drop
  RobloxCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 16, 2026
• Design Search Autocomplete System
  RobloxCoding & Leetcode-style QuestionsDifficulty 4/5Last asked Oct 16, 2026
• Behavioral: Handling Disagreements with Peers, Other Teams and Junior Teammates
  GoogleBehavioralDifficulty 3/5Last asked Oct 16, 2026
• Behavioral: Implementing a Process With AI
  AmazonBehavioralDifficulty 3/5Last asked Oct 16, 2026
• Token-List Calculator (+, -, *, /)
  CollegeVineCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 15, 2026
• MapReduce Map and Reduce Functions for Top-K Values Per Key
  DatabricksCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 15, 2026
• Job Tree Total Cost and Top Root Jobs
  CollegeVineCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 15, 2026
• Find Missing Number in a Sorted Array
  Arista NetworksCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 15, 2026
• Tally Service with Retention Window
  MetaCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 15, 2026
• Remove All Nodes With Duplicate Values From a Sorted Linked List
  Arista NetworksCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 15, 2026
• String Abbreviation Matching
  MetaCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 15, 2026
• Skew Metrics for a Connection-Count Histogram
  LinkedInCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 15, 2026
• Maximum Value With a Unit-Weight Capacity
  GoogleCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 15, 2026
• LFU Cache (Full Implementation)
  NVIDIACoding & Leetcode-style QuestionsDifficulty 4/5Last asked Oct 15, 2026
• Design an API for Embedding and Classification Results
  Scale AISystem Design for MLDifficulty 3/5Last asked Oct 15, 2026
• ML Design: Recruiter Hiring Pipeline Assistant
  LinkedInSystem Design for MLDifficulty 4/5Last asked Oct 15, 2026
• Speculative Edit Decoding
  xAICoding & Leetcode-style QuestionsDifficulty 4/5Last asked Oct 15, 2026
• Design an Amazon Locker System
  AmazonCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 14, 2026
• Phone Keypad — Letter Combinations / Word Filter
  LinkedInCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 14, 2026
• Delivery Billing System: Cost, Pay-Up-To, 24h Active Drivers
  RipplingCoding & Leetcode-style QuestionsDifficulty 4/5Last asked Oct 14, 2026
• Pairwise Modulo Checksum: Sum of i mod j + j mod i up to n
  ConfluentCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 14, 2026
• Move the N-th Node of a Singly Linked List to the Front
  LinkedInCoding & Leetcode-style QuestionsDifficulty 1/5Last asked Oct 14, 2026
• Sliding Window Conversation Scores with Update and Percentile Query
  DecagonCoding & Leetcode-style QuestionsDifficulty 4/5Last asked Oct 14, 2026
• Design a Sales Tax Engine (Address + Date to Tax)
  SphereSystem Design for MLDifficulty 4/5Last asked Oct 14, 2026
• Merge Two Sorted Linked Lists Into One In Place
  SalesforceCoding & Leetcode-style QuestionsDifficulty 1/5Last asked Oct 14, 2026
• Evaluate arithmetic equations from parallel arrays
  Capital OneCoding & Leetcode-style QuestionsDifficulty 1/5Last asked Oct 14, 2026
• Babysitter Quote with Time-of-Day Rate Bands
  UpstartCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 14, 2026
• Rotate Matrix Over Diagonals
  Capital OneCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 14, 2026
• Stack-Language Interpreter and Jump-Debugging Program Rewriter
  Jane StreetCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 14, 2026
• Design an Online Chess Platform (Matchmaking, Live Games, Clocks)
  UpstartSystem Design for MLDifficulty 4/5Last asked Oct 14, 2026
• In-memory workspace credit system with transfers, scheduling and merge
  AirbnbCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 14, 2026
• Detect a Cycle in a Linked List
  SalesforceCoding & Leetcode-style QuestionsDifficulty 1/5Last asked Oct 14, 2026
• Speed Up the Latest New Job Query on a 100M-Row Table
  SphereSystem Design for MLDifficulty 3/5Last asked Oct 14, 2026
• Code Editor Folding with Brace Matching and Preserved Nested Fold State
  Jane StreetCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 14, 2026
• Sort Topic Names by Prefix and Numeric Suffix
  PerplexityCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 14, 2026
• Design a URL Shortener with Aliases, Expiry and Click Analytics
  AmazonSystem Design for MLDifficulty 3/5Last asked Oct 14, 2026
• Sales Tax Owed per State from Transactions and Tax Authorities
  SphereCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 14, 2026
• Airline Booking System: Search, Seat Hold, Purchase and Cancel
  ReevoSystem Design for MLDifficulty 3/5Last asked Oct 14, 2026
• Count Unordered Ways to Reach a Total Weight Using Parts 1 to k
  ConfluentCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 14, 2026
• Count arithmetic triplets in a multiset after each query
  Capital OneCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 14, 2026
• Streaming Task Scheduler with Cancellation and a Simulated Clock
  AmazonCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 14, 2026
• Maximum Subarray Sum With Edge Cases
  UpstartCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 14, 2026
• Evaluate Formula
  Applied IntuitionCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 14, 2026
• Branch with the most pushed files from a command log
  Capital OneCoding & Leetcode-style QuestionsDifficulty 1/5Last asked Oct 14, 2026
• Design Prompt Playground
  AnthropicSystem Design for MLDifficulty 3/5Last asked Oct 13, 2026
• Crash-Resilient LRU Memoization Cache
  AnthropicCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 13, 2026
• Durable Key-Value Store Serialization
  OpenAICoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 13, 2026
• SET Card Game: Validate a Triple and List All Sets on the Table
  SnowflakeCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 13, 2026
• Boundary of Binary Tree
  SnowflakeCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 13, 2026
• Check-and-Insert for a Growing Set of User IDs
  MercorSystem Design for MLDifficulty 3/5Last asked Oct 13, 2026
• Permutation Sort and the Rank of the First Sorted Ordering
  MercorCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 13, 2026
• Single-Pass S-Expression Parser with Error Positions
  BasetenCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 13, 2026
• Debug a Quadratic CSV Writer: Trailing Commas and Quoting
  MercorCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 13, 2026
• Phrase search over multiple documents
  ConfluentCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 13, 2026
• Debug a Payment Service That Double-Charges on Retry
  MercorCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 13, 2026
• Design an LLM-Backed Customer-Service Chat System with Failure Handling
  SierraSystem Design for MLDifficulty 4/5Last asked Oct 13, 2026
• Design a podcast publishing and feed system
  ConfluentSystem Design for MLDifficulty 4/5Last asked Oct 13, 2026
• Design an Observability Logging System (Emit and Query)
  BasetenSystem Design for MLDifficulty 4/5Last asked Oct 13, 2026
• Implement k-means clustering from scratch
  LyftCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 13, 2026
• Coffee Cups: Probability One Customer's Two Cups Beat the Other's
  MercorML Fundamentals & AlgorithmsDifficulty 2/5Last asked Oct 13, 2026
• XOR-Shift Generator and Tree Document Encryption
  BasetenCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 13, 2026
• Design a 1:1 Chat System (Pub/Sub, Partitioning, Multi-Region)
  AnthropicSystem Design for MLDifficulty 4/5Last asked Oct 13, 2026
• Sudoku validator and solver
  ConfluentCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 13, 2026
• Cloud IDE
  OpenAISystem Design for MLDifficulty 4/5Last asked Oct 6, 2026
• Find Robot Position from Blocker Distances
  UberCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 6, 2026
• Review and Fix an Express /authenticate Endpoint
  OktaCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 6, 2026
• Where to Leverage ML in an End-to-End Task Marketplace
  UberSystem Design for MLDifficulty 4/5Last asked Oct 6, 2026
• Document Indexing Queue Across m Indexers
  GleanCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 6, 2026
• Token Bucket Rate Limiter as an Express Take-Home
  OktaCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 6, 2026
• Cross-Domain SSO After an Acquisition, and OIDC Across Sites
  OktaSystem Design for MLDifficulty 4/5Last asked Oct 6, 2026
• URL Maze — Recursive API Crawl to Congrats
  RampCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 6, 2026
• Build a Workflow Service, Using an AI Assistant
  FurtherAICoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 5, 2026
• In-Memory Rate Limiter from a Worked Trace
  PatreonCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 5, 2026
• Work Queue with Task Dependencies (Leases, Retries, Dead-Letter)
  OpenAICoding & Leetcode-style QuestionsDifficulty 4/5Last asked Oct 3, 2026
• Harvey Values / Behavioral
  HarveyBehavioralDifficulty 3/5Last asked Oct 3, 2026
• Design Google Drive / Data Room
  HarveySystem Design for MLDifficulty 3/5Last asked Oct 3, 2026
• Frontend System Design: Autocomplete Search Input
  AirwallexSystem Design for MLDifficulty 3/5Last asked Oct 3, 2026
• Product Intuition: Cutting Scope to Ship
  FurtherAIBehavioralDifficulty 3/5Last asked Oct 3, 2026
• Task Scheduler for Asynchronous Functions (Serial per Name)
  AirwallexCoding & Leetcode-style QuestionsDifficulty 4/5Last asked Oct 3, 2026
• Business Round: Do You Care How Underwriting Actually Works
  FurtherAIBehavioralDifficulty 3/5Last asked Oct 3, 2026
• Project Deep Dive: How You Actually Used AI to Build It
  FurtherAIBehavioralDifficulty 3/5Last asked Oct 3, 2026
• CTO Round: Why a Startup, and Why This One
  FurtherAIBehavioralDifficulty 2/5Last asked Oct 3, 2026
• Count Occurrences of the Suffix Maximum for Each Query
  MicrosoftCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Aug 26, 2026
• Distributed Device Control
  OpenAISystem Design for MLDifficulty 4/5Last asked Aug 19, 2026
• Linear Algebra (BP)
  OpenAIDeep Learning & ArchitecturesDifficulty 4/5Last asked Aug 9, 2026
• Two-Player Array Picking Game with Reverse-on-Odd Rule (Score Difference)
  ADIACoding & Leetcode-style QuestionsDifficulty 3/5Last asked Aug 8, 2026
• Concurrency & Multithreading Debugging
  World labsCoding & Leetcode-style QuestionsDifficulty 4/5Last asked Aug 5, 2026
• GPU Credits 2
  OpenAICoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 21, 2026
• Design ChatGPT: A Conversational LLM Serving Platform
  OpenAIAnthropicxAISystem Design for MLDifficulty 4/5Last asked Jul 21, 2026
• Stage Makespan with Ordered Job Assignment
  PlaidCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 21, 2026
• Behavioral: Following Your Manager's Idea Over Your Own
  RBC Royal BankBehavioralDifficulty 3/5Last asked Jul 21, 2026
• Implement an In-Memory Key-Value Store
  RBC Royal BankCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Jul 21, 2026
• Design an Event Ticket Marketplace: Seat Holds and On-Sale Traffic
  MercorSystem Design for MLDifficulty 3/5Last asked Jul 21, 2026
• Sequential Pipeline Job Completion
  PlaidCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 21, 2026
• Boolean Rule Parser and Evaluator
  StripeCoding & Leetcode-style QuestionsDifficulty 4/5Last asked Jul 20, 2026
• Email Log Grouping and Sorting
  StripeCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 20, 2026
• Debugging: CSV Parser Quote Handling
  StripeCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 20, 2026
• Horizontal Cut That Halves the Area of Rectangular Cakes
  GoogleCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 20, 2026
• Check Whether a Mahjong Hand Is Winning
  GoogleCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 20, 2026
• Sort an Array with One Misplaced Element
  GleanCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 20, 2026
• Weekly Deployment Window Scheduler
  StripeCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 18, 2026
• Distributed Matrix Multiplication with Data Parallel and FSDP Simulation
  xAISystem Design for MLDifficulty 4/5Last asked Jul 15, 2026
• Flatten a Nested Python Structure (lists/dicts/tuples) into a List of Integers
  xAICoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 15, 2026
• Build an LLM Evaluation Harness with Ollama Integration
  MercorMLOps & DeploymentDifficulty 3/5Last asked Jul 15, 2026
• Unflatten: Refill a Nested Template Structure with Values from a Flat List
  xAICoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 15, 2026
• Sudoku Solver
  CrusoeCoding & Leetcode-style QuestionsDifficulty 4/5Last asked Jul 15, 2026