Real Coding & ML Interview Questions

3,584 reported questions, newest reports first. Browse by company or by topic.

• Implement a Leader-Follower Distributed System with Membership, Failover Detection, and Leader Election (Practical pair-programming)
  DiscordSystem Design for MLDifficulty 4/5Last asked Oct 19, 2026
• Efficient Tokenizer
  PerplexityLLMs & Prompt EngineeringDifficulty 4/5Last asked Oct 17, 2026
• Design Post Search with Keyword Exclusion and Frequency Ranking
  LinkedInSystem Design for MLDifficulty 3/5Last asked Oct 17, 2026
• Ride Request Demand Prediction by Geohash and Premium Multiplier
  LyftSystem Design for MLDifficulty 4/5Last asked Oct 17, 2026
• Build a Workflow Service, Using an AI Assistant
  FurtherAICoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 16, 2026
• In-Memory File System
  HarveyCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 16, 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 2/5Last 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 2/5Last asked Oct 16, 2026
• Longest Suffix-Prefix Overlap of Two Strings
  CrestaCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 16, 2026
• Text Editor with Cursor Movement
  DatologyAICoding & Leetcode-style QuestionsDifficulty 2/5Last 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 2/5Last 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 2/5Last asked Oct 16, 2026
• Behavioral: Implementing a Process With AI
  AmazonBehavioralDifficulty 2/5Last asked Oct 16, 2026
• MapReduce Map and Reduce Functions for Top-K Values Per Key
  DatabricksCoding & Leetcode-style QuestionsDifficulty 2/5Last 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
• Remove All Nodes With Duplicate Values From a Sorted Linked List
  Arista NetworksCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 15, 2026
• Token-List Calculator (+, -, *, /)
  CollegeVineCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 15, 2026
• Maximum Value With a Unit-Weight Capacity
  GoogleCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Oct 15, 2026
• Design an API for Embedding and Classification Results
  Scale AISystem Design for MLDifficulty 3/5Last asked Oct 15, 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
• SET Card Game: Validate a Triple and List All Sets on the Table
  SnowflakeCoding & Leetcode-style QuestionsDifficulty 2/5Last 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 Observability Logging System (Emit and Query)
  BasetenSystem Design for MLDifficulty 4/5Last 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
• Mapping Celestial Coordinates for Sky Navigation
  AuroraSystem Design for MLDifficulty 3/5Last asked Oct 7, 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
• In-Memory Rate Limiter from a Worked Trace
  PatreonCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 5, 2026
• Two-Player Array Picking Game with Reverse-on-Odd Rule (Score Difference)
  ADIACoding & Leetcode-style QuestionsDifficulty 3/5Last asked Oct 3, 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
• K-Means Clustering on Image Patches
  TeslaDeep Learning & ArchitecturesDifficulty 5/5Last asked Sep 10, 2026
• Trajectory Waypoint Distance Queries
  TeslaCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Sep 10, 2026
• Classify a Float Into One of Two Arrays
  Google DeepMindML Fundamentals & AlgorithmsDifficulty 3/5Last asked Aug 27, 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
• Twitter Insight Platform (CodeSignal Take-Home)
  xAIMLOps & DeploymentDifficulty 3/5Last asked Aug 19, 2026
• ML Debugging (Transformer)
  OpenAIDeep Learning & ArchitecturesDifficulty 4/5Last asked Aug 15, 2026
• Linear Algebra (BP)
  OpenAIDeep Learning & ArchitecturesDifficulty 4/5Last asked Aug 9, 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
• Weekly Deployment Window Scheduler
  StripeCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 18, 2026
• Stock Transaction Sequence Counting (Catalan / DP)
  OptiverCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 15, 2026
• Design a Pickup Area Driver Queue
  UberSystem Design for MLDifficulty 4/5Last asked Jul 11, 2026
• Build an Arithmetic Expression to Reach a Target
  WaymoCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 9, 2026
• Agents / Coding with LLMs
  AnthropicLLMs & Prompt EngineeringDifficulty 4/5Last asked Jul 7, 2026
• Video-Keyword Association Review System
  ByteDanceSystem Design for MLDifficulty 3/5Last asked Jul 7, 2026
• AI-Assisted Full-Stack OA (Spring Boot and React)
  Walmart LabsCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 7, 2026
• Minimum Talent-Complete Team from Every Start
  Walmart LabsCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 7, 2026
• Merge Strings Alternately
  Walmart LabsCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Jul 7, 2026
• Project Deep Dive (Resume Drill)
  ByteDanceML Fundamentals & AlgorithmsDifficulty 3/5Last asked Jul 6, 2026
• Number of Islands and Grid BFS Variants
  ByteDanceCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 6, 2026
• Content Moderation System Design
  ByteDanceSystem Design for MLDifficulty 4/5Last asked Jul 6, 2026
• L6 Staff System Design Loop (Google)
  GoogleSystem Design for MLDifficulty 5/5Last asked Jul 6, 2026
• Highest Average Score Per Person
  Goldman SachsCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Jul 6, 2026
• Race Car: Minimum Instructions to Reach a Target
  WaymoCoding & Leetcode-style QuestionsDifficulty 4/5Last asked Jul 6, 2026
• Campaign Cost Weekly Partition
  SalesforceCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 5, 2026
• Behavioral: Amazon Leadership Principles Standard Set
  AmazonBehavioralDifficulty 2/5Last asked Jul 4, 2026
• Behavioral: GenAI Usage, Failure, and Tradeoffs
  AmazonBehavioralDifficulty 2/5Last asked Jul 4, 2026
• Reachable Nodes in a Directed Graph
  SoFiCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 4, 2026
• LLM SQL Chatbot Access Control and Query Safety
  NVIDIASystem Design for MLDifficulty 3/5Last asked Jul 3, 2026
• Hiring Manager / Final Behavioral Round
  ByteDanceML Fundamentals & AlgorithmsDifficulty 3/5Last asked Jul 3, 2026
• Data Platform, Pipeline, and ML Operations Fundamentals
  NVIDIAMLOps & DeploymentDifficulty 3/5Last asked Jul 3, 2026
• SRE Linux / Networking Troubleshooting Round
  ByteDanceCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 3, 2026
• Hardware-Adjacent Project Deep Dive
  NVIDIABehavioralDifficulty 3/5Last asked Jul 3, 2026
• Culture Fit, Motivation, and Learning Habits
  NVIDIABehavioralDifficulty 3/5Last asked Jul 3, 2026
• Telemetry Collector and GPU Utilization Dashboard
  NVIDIASystem Design for MLDifficulty 3/5Last asked Jul 3, 2026
• AI Code Craft Challenge: Delayed-Delivery Workflow Engine
  DoorDashCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 2, 2026
• ML System Design: Restaurant / Store Recommendation
  DoorDashSystem Design for MLDifficulty 4/5Last asked Jul 2, 2026
• MLE ML Knowledge and Discussion Round
  DoorDashML Fundamentals & AlgorithmsDifficulty 4/5Last asked Jul 2, 2026
• Implement Max Pooling with Argmax Coordinates
  WaymoCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 2, 2026
• Top-K Frequent in Large Logs
  GoogleCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 2, 2026
• Longest Consecutive Path in Binary Tree
  GoogleCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 2, 2026
• Core Dump Collection System Design
  AmazonSystem Design for MLDifficulty 4/5Last asked Jul 2, 2026
• Trie Prefix Search / Autocomplete
  GoogleCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 2, 2026
• Hiring Manager Behavioral Round
  DoorDashBehavioralDifficulty 2/5Last asked Jul 2, 2026
• Path Between Nodes in a Fibonacci Tree
  DatabricksCoding & Leetcode-style QuestionsDifficulty 4/5Last asked Jul 2, 2026
• Basic Calculator with Postfix Notation
  AmazonCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Jul 2, 2026
• Closest Version Date to a Target
  AmazonCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Jul 2, 2026
• Spreadsheet / Formula Engine
  HarveyCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 2, 2026
• Maximum Concurrent Processes from Intervals
  AmazonCoding & Leetcode-style QuestionsDifficulty 2/5Last asked Jul 2, 2026
• Text Highlighting / Citation Tagging
  HarveyCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 2, 2026
• ML Systems Codebase Deep Dive on One Project
  AppleMLOps & DeploymentDifficulty 3/5Last asked Jul 1, 2026
• Design a Pizza Ordering and Fulfillment System (OOD)
  AmazonSystem Design for MLDifficulty 3/5Last asked Jul 1, 2026
• Piano Hand Movement Grouping
  GoogleCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 1, 2026
• AI-Conducted Recruiter Screening Interview
  SnowflakeBehavioralDifficulty 2/5Last asked Jul 1, 2026
• Service Shutdown via Topological Propagation
  AmazonCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 1, 2026
• Closest Bathroom / Desk on a Grid
  SnowflakeCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jul 1, 2026
• Expense Rules Engine (Extensible)
  RipplingCoding & Leetcode-style QuestionsDifficulty 4/5Last asked Jul 1, 2026
• Design a GPU Scheduling Platform
  OpenAIAnthropicSystem Design for MLDifficulty 4/5Last asked Jun 30, 2026
• REST API Integration and Aggregation
  StripeCoding & Leetcode-style QuestionsDifficulty 3/5Last asked Jun 30, 2026