DarkInterview - Real Interview Questions from Top Tech Companies

System Design Interview

Non-Functional Requirements Network Communication Data Modeling API Design Consistent Hashing Numbers to Know

Database Blob Store Load Balancer Content Delivery Network Distributed Cache Distributed Message Queue Pub/Sub Rate Limiter

Design a URL Shortener Design a Distributed KV Store Design WhatsApp Design Twitter Design YouTube Design a Payment System Design Yelp Design Uber Design a Webhook System Design ChatGPT Design Google Docs Design Google Calendar Design an AI Rate Limiter Design a News Aggregator Design an Ad Event Aggregator Design a Hotel Booking System Design an Ads Frequency Cap

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Design YouTube

YouTube is a video streaming platform where users upload, stream, and discover video content. With 2.5 billion monthly active users and 500+ hours of video uploaded every minute, designing YouTube is a classic system design interview question that tests your understanding of video processing, storage optimization, and content delivery at massive scale.

This walkthrough follows the Interview Framework and focuses on what you'd actually present in a 45-60 minute interview.

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Design Twitter

Design a Payment System

Interviews at:OpenAI·Anthropic·xAI·Databricks·Perplexity·Stripe·Rippling·Netflix·Coinbase