Data structures and algorithms. I bombed pretty hard during an interview session at Microsoft last month.
It's great that I can build and design sites and applications, but I'm in the phase where the question becomes related to performance and scalability. And next year will be centered around that.
Congrats on getting an interview, that's an achievement on it's own! For what it's worth, interviews for senior and above tend towards system design and behavioral/situational questions rather than Leetcode.
From what I hear, just getting an interview with Microsoft means you must be pretty badass already! ;D
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