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Crack the System Design interview: tips from a Twitter software engineer

Zhia Chong
10 min readApr 19, 2018

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I recently wrote about how I landed offers from multiple top-tier tech companies. During my interview preparation process, I read up on a lot of material and prepared a set of notes on how to tackle system design problems. In this article, I’d like to share those tips with you all.

If you’re a fresh graduate with no experience in large-scale distributed systems, or even a seasoned engineer with years of experience under your belt, this article will be useful for you.

Update (3/24/2019): If you’d like to join a group of students to learn more about system design, I’m organizing a small class together! You can go to this link to learn more, or visit my website: zhiachong.com for more info.

How to System Design: Tips from a Twitter software engineer

This article is broken down into the following four sections:

  • Ask clarification questions
  • Use your background
  • Tackle a problem systematically
  • Keep your own notes

Ask clarification questions

A core aim of a systems design interview is to give the candidate an opportunity to demonstrate their knowledge.

There are no strictly right or wrong answers. A good system design question usually sounds…

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Zhia Chong
Zhia Chong

Written by Zhia Chong

Software Engineer @Twitter, retired tennis player@🇲🇾 my website @zhiachong.com

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