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

More to come...

Design a Webhook System

Asked by:OpenAI

A webhook system receives real-time event notifications from external services (Stripe, Shopify, GitHub) and processes them reliably. Unlike polling-based APIs where you repeatedly ask "did anything change?", webhooks push data immediately when events occur—making them efficient for real-time integrations.

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

Unlock Premium to Keep Reading

Get full access to all system design lessons and ace your interviews

Design Uber

Design ChatGPT

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