High level design
System design, taught the way it is actually used. Every diagram on these pages is drawn by code rather than exported from a design tool, so it moves, it responds to what you drag, and it fits on your phone. Every page stops a few times and asks you to commit to an answer before it gives you one.
The pages are written for a specific moment: you have an interview in a few weeks, you have read a dozen blog posts, and you still cannot start from a blank whiteboard.
Start here
If you have two weeks, read them in this order. Back of the envelope math first, because every question after it opens with a number, and the rest of the round is a response to that number.
Building blocks
Design questions
India scale
Systems you use every day, at volumes most global case studies never have to handle.
What is coming
More building blocks: latency numbers worth memorising, caching patterns, replication and sharding. More questions: chat, news feed, web crawler. And more of the India scale set, starting with IRCTC tatkal booking and live cricket score fan out.
