Free resources

Free notes and interview questions

A one-page summary and a set of interview questions with model answers for every Short we publish, starting with system design. Notes need no login. Interview questions are free with an account.

• System Design #3

  L4 vs L7 load balancers

  How each type routes traffic, and when to choose AWS NLB or ALB.

  Get the notes

• System Design #2

  Vertical vs horizontal scaling

  Scale up or scale out, and why stateless servers make scaling out possible.

  Get the notes

• System Design #1

  Why your app crashes at 10,000 users

  Load balancers, autoscaling, caching and queues: the 4 building blocks of a scalable app.

  Get the notes