The other day Kyle complained about system design interviews on twitter and I shared a few words of advice. You might like them too :)
[tweet gone private]
This is the point of system design interviews. To find where your strengths are and aren't. (important for team building)
Ideally you have a rough high level sketchy understanding of all the pieces and enough humility to say "I don't know"
I've done several dozen of these interviews over the past ~year and the easiest way to fail were people who pretended to know about something they didn't.
Anyone who said "I've never done this but here's what I'd look into" got a 👍
Details depend on position.
I'd expect a fullstack engineer to know SQL and be able to explain what a CDN is for. But for a pure frontend, I'd dig more into domain modeling and state management.
As for how to get better ... I think this is one of those things that work like the pottery class metaphor.
You have to design a bunch of systems and get feedback.
The best feedback comes from production.
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