Agreed, just because you're a senior engineer with decades of experience doesn't mean you shouldn't brush up on general fundamentals every once in a while. Leet

Agreed, just because you're a senior engineer with decades of experience doesn't mean you shouldn't brush up on general fundamentals every once in a while. Leetcode, while being pretty useless in the real world, does get your brain into "answer hard questions under pressure" mode. Systems design questions prompt you to architect things which may be considerably different than you deal with during your day-to-day. Preparing for an interview, for more senior developers, is mostly mental - even if you know the information required, can you retrieve it quickly? Do you get flustered under time pressure? Are you in hour 4 and getting tired/sloppy? A bit of studying can help make some answers automatic, and help you present your best self.