What's New

New Coding Question for OpenAI

Added "Two-Player Card Game", a three-part CardGame problem (deal and score, flush, fold decisions), to the OpenAI coding practice question bank.

New round type: Design Doc Review (Anthropic)

Two doc-review questions from Anthropic's system design loop: critique a chat LLM inference serving design (with a GPU worker placement puzzle) and a first-draft prompt playground design. Each comes with a structured review editor, capacity math, ranked issues and a sample review.

New course: Design Doc Review

How to prepare for the critique-style system design round: the format and scoring, a five-pass review framework, how to deliver findings constructively, and a worked example on an LLM inference doc.

New Coding Questions for Sierra

Added six Sierra coding practice questions: spreadsheet cyclic reference detection, Markdown chunking with header breadcrumbs, paginated conversation history, product catalog retries and fallback chains, timestamped transcript merging, and composable stream classes.

New Building Block: How LLM Inference Actually Works (with Video)

The fundamentals prequel to Batch Inference at Scale, now with a full video walkthrough. From the moment you hit enter down to the GPU's memory system: prefill vs decode, the KV cache, continuous batching, and the scaling signals that answer every deep-dive follow-up.

New Coding Question for Anthropic

Added "Finance Agent" to the Anthropic coding practice question bank.

Model Distribution at Scale (Live Course)

New live system design course: design a pipeline that fans a 500 GB model from S3 to 1,000 GPUs in ~7 minutes — BitTorrent-style peer propagation, manifest-based tracking for a debuggable pipeline, surviving rack failures, and stress-testing at 10,000 workers. Derive every number live. 60-min session Tue May 19, 7 PM PT.

How I Got Offer From OpenAI

ShowOffer candidate share his real story to get offer from OpenAI

New OA Coding Questions for ElevenLabs

Added 3 new OA coding questions for ElevenLabs (CoderPad Screen, 90 minutes): Sequence Join Point, Network Endpoint or Loop, and Wind and Leaves Grid.

New Coding Question for Uber

Added "First Unique Log Entry" to the Uber coding practice question bank, with a follow-up on scaling to 10M logs.

New Coding Question for Uber

Added "Design Meeting Scheduler" to the Uber coding practice question bank.

New Coding Questions for Uber (OA / Screening / Onsite)

Added 15 new Uber coding questions, organized into separate OA, Screening, and Onsite stage sections.

DoorDash Coding Question: Code Craft - Driver Payment System

Added new Hard coding question: Code Craft - Driver Payment System, a three-part sweep-line problem covering multi-order pay, pickup-time adjustment, and peak-hour multipliers.

DoorDash Coding Question: Code Craft - Bootstrap API

Added new coding question: Code Craft - Bootstrap API, a service aggregation problem covering partial failures, default values, concurrency, and retry/timeout design.

Stripe Interview Questions

Revisited new OA, Coding, Debug, Integration and System Design question.

How to Prepare Project Retro Interview

Project Retro Interview Tips

Perplexity System Design Questions

Added new system design question: Design a Personal Finance Manager (Mint).

C3 AI System Design Questions

Refreshed 3 system design questions: Design a Restaurant Booking Service, Design a Parking Lot Management System, and Design Car Rental Service System.

Reddit System Design Questions

Refreshed 3 system design questions: Design a Notification System, Design a historic 'hot' posts page, and Design a News Aggregator System.

Rippling System Design Questions

Refreshed 3 system design questions: Design a Hotel Booking System, Design a News Aggregator System, and Design a Social Media Feed Generation System.

Datadog System Design Questions

Refreshed 3 system design questions: Design YouTube, Design a personal finance tracker, and Design a Discounted Flight Alert System.

NVIDIA System Design Questions

Refreshed 5 system design questions: Design LeetCode, Design a Ticket Booking System, Design a Restaurant Booking Service, Design a Job Scheduler, and Design Paste Bin with Monitoring.

Toast System Design Questions

Refreshed 2 system design questions: Design a Restaurant Booking Service and Design a Hotel Booking System.

Twilio System Design Questions

Refreshed 2 system design questions: real-time restaurant discovery platform and e-commerce offer subscription system.

Snowflake System Design Questions

Refreshed 5 system design questions: Design a Webhook Callback System, Design a leasing system, Design a Job Scheduler, Design a data ingestion system, and Design a sequence number generator.

Atlassian System Design Questions

Refreshed 7 system design questions: Design a Top-K System, Design a Trending Hashtags System, Design a Web Crawler, Design a News Aggregator System, Design a Tagging System for Atlassian Products, Design a Color Picker, and Design a News Feed Ranking System.

Wise System Design Questions

Refreshed 2 system design questions: Design a Job Scheduler and Design a Merchant Payout System.

ServiceTitan System Design Questions

Refreshed 2 system design questions: Design a URL Shortener and Design Paste Bin with Monitoring.

HubSpot System Design Questions

Refreshed 2 system design questions: Design Netflix/Video Streaming Platform and Design a Weather System.

Visa System Design Questions

Refreshed 2 system design questions: Design a Rate Limiter and Design a Visa Payment Network System for Transaction Processing.

Mastercard System Design Questions

Refreshed 2 system design questions: Design Car Rental Service System and Design a Top-K Recommendation System.

CrowdStrike System Design Questions

Refreshed 2 system design questions: Design Redis and Design a Real-Time Event Message System.

Oracle System Design Questions

Refreshed 16 system design questions: Design Instagram, Design Live Comments, Design a Top-K System, Design a URL Shortener, Design a Distributed Cache, Design a Traffic Monitoring System, Design a Rate Limiter, Design a Temperature Monitoring System, Design Uber, Design an AI Tutoring Platform, Design a Notification System, Design a Hotel Booking System, Design a News Aggregator, Design Spotify, Design a Healthcare Document System, and Design a Healthcare Platform.

Bloomberg System Design Questions

Refreshed 7 system design questions: Design a Top-K System, Design a Web Crawler with Limited Communication, Design Google Docs, Design a Health Monitoring System for Database Servers, Design a Social Media Feed Generation System, Design a Train Reservation System, and Design a stock ticker tracking system.

System Design Questions Update

Revisited system design practice questions for Fountain, Freelancer, Goldman Sachs, Graphite, Highnote, HyperFace, Instacart, Justworks, Lightspeed, and LiveRamp with clearer explanations and linked learning resources.

Roblox System Design Questions

Revisited 9 system design practice questions with clearer explanations, interviewer focus areas, and linked learning resources.

Lyft System Design Questions

Revisited 5 system design practice questions with clearer explanations, interviewer focus areas, and linked learning resources.

Snapchat System Design Questions

Revisited 4 system design practice questions with clearer explanations, interviewer focus areas, and linked learning resources.

TikTok System Design Questions

Revisited 3 system design practice questions with clearer explanations, interviewer focus areas, and linked learning resources.

Spotify System Design Questions

Revisited 2 system design practice questions with clearer explanations, interviewer focus areas, and linked learning resources.

DoorDash System Design Questions

Revisited 7 system design practice questions with clearer explanations, interviewer focus areas, and linked learning resources.

Brex System Design Questions

Revisited 2 system design practice questions with clearer explanations, interviewer focus areas, and linked learning resources.

System Design Questions Update

Revisited system design practice questions for ZoomInfo and Zscaler with clearer explanations and linked learning resources.

System Design Questions Update

Revisited system design practice questions for Addepar, Adobe, Anchorage Digital, Anduril, Apexx Global, Asana, Aurelian, Blue Origin, Carta, and Clever with clearer explanations and linked learning resources.

System Design Questions Update

Revisited system design practice questions for Tesla, Thrive Global, Trustpilot, Twitch, Udemy, UiPath, Underdog Fantasy, Whatnot, Whoop, and Zoom with clearer explanations and linked learning resources.

System Design Questions Update

Revisited system design practice questions for Macquarie Group, Metropolis, Miro, N26, Navan, Okta, Oscilar, Palo Alto Networks, Perplexity, and Pinterest with clearer explanations and linked learning resources.

MongoDB System Design Questions

Refreshed 4 system design questions: messenger/chat application, Netflix video streaming, multi-player Figma, and API gateway.

Coinbase System Design Questions

Refreshed 4 system design questions: Design DropBox, Design Slack, Design a Crypto Exchange, and Design a stock trading platform.

PayPal System Design Questions

Refreshed 4 system design questions: Design an Online Game Leaderboard, Design a price notification system, Design a URL Shortener, and Design a Basic Auth System.

Capital One System Design Questions

Refreshed 4 system design questions: Design a signup system for a bank, Design a credit card system with approval of payments, Design a Banking Application, and Design a credit card management and offers system.

Google System Design Questions

Revisited 38 system design practice questions with clearer explanations, interviewer focus areas, and linked learning resources.

Apple System Design Questions

Revisited 15 system design practice questions with clearer explanations, interviewer focus areas, and linked learning resources.

Anthropic Interview Questions

Added 19 new questions: 5 system design (inference API, prompt playground, batching, chat, model deployment) and 14 behavioral (AI safety, values, culture fit).

Meta Post Privacy

System design walkthrough: design privacy controls for a social media platform.

Common Red Flags

Avoid these common mistakes that cost candidates their behavioral rounds.

Delivery Frameworks

Learn structured frameworks to deliver clear, compelling behavioral answers.