Question 1

What is theonsite.dev?

Accepted Answer

theonsite.dev is an interactive platform for practicing system design interviews. You draw on a whiteboard canvas, record your sessions, and compare your solutions to expert answer keys — just like a real interview at Google, Meta, or Amazon.

Question 2

How many system design challenges are available?

Accepted Answer

There are 17 curated system design challenges spanning beginner, moderate, and advanced difficulty levels. Examples include Design a URL Shortener, Design Twitter's News Feed, Design Uber, and Design YouTube.

Question 3

Is theonsite.dev free?

Accepted Answer

Yes — you can start with 1 free beginner challenge including the interactive Excalidraw canvas and unlimited practice time. Pro unlocks all 17 challenges, session recording, and expert answer keys for $9.99/month.

Question 4

What companies do these system design questions prepare you for?

Accepted Answer

The challenges cover the same system design topics asked at Google, Meta, Amazon, Apple, Netflix, Microsoft, Uber, Airbnb, and other top tech companies. They range from classic questions like URL Shortener to complex problems like designing a distributed message queue.