I got a mixture of LC easy and medium. Practice the ones from the tagged problems on LC should be sufficient. Also had a round of system design where I just briefly talk about how I would design a system, not too in depth.
What is your YOE? Because they may have different expectations of you. I had ~2 YOE and I read through Grokking the system design interview while preparing. Make sure you understand the different components you would use to build a distributed system (LBs, Cache, etc) and their trade offs.
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Also what was the location you interviewed at