System Design Interview with a Facebook Engineer: Design Online Judge

This is a Mock Systems Design Interview where the prospective candidate must tackle an E4/E5 Level Systems Design Question from a Facebook Engineer. "Design Online Judge" requires candidates to consider designing a Leetcode-style platform that allows code to be executed safely and securely! Watch now to learn how to build safe and efficient systems.

🕑TIMESTAMPS
00:00 Start
00:30 Introductions
03:14 Question Starts: Design Online Judge
04:15 Clarifying Priorities - What does the interviewer want?
05:20 Functional
07:08 Non functional
10:53 Capacity Estimates: Traffic(QPS/TPS), Bandwidth, Storage, Memory
43:20 Feedback from interviewer

[LongweiSu]

It is funny that the interviewer emphasizes "don't explain, don't stop and keep going".
When the table turned, the interviewer explain everything nicely and thoroughly :)

I guess the takeaway is:
1. it only has 35 mins, so keep the flow going, make random assumptions, and only pause if there is an important trade-off time.
2. This is not a discussion panel, the interviewer this question inside out. You only deep dive when asked.
3. Ignore the details. Service(Block), API(Line), and DB scheme(what's in the block) are the 3 major components that are worth talking about.

Thank you for showing what a real interview looks like.

[Global_nomad_diaries]

This is the best interviewer, the way they provide the feedback is awesome.

[NIRAVR]

Great video and tips. Is it possible to post the links to those example youtube links mentioned at the end?

[murt]

Lol where is the excalidraw recording?

[oakvillian]

nit: VPC = Virtual Private Cloud (not container)