Fellow "slow thinker" here. Yes, you can! In fact, I recently got a staff engineering role at FAANG. I also have really bad performance anxiety and don't sleep

Fellow "slow thinker" here. Yes, you can! In fact, I recently got a staff engineering role at FAANG. I also have really bad performance anxiety and don't sleep at all before interviews. Yes, it felt like everything was stacked against me and I thought I'd never be able to pass these interviews. I won't touch on handling the anxiety since you don't mention it, but for "slow thinking", what you need to do is train the pattern matching part of your brain that doesn't require deep thought to answer questions. The way to do that has been covered extensively for FAANG - you just need to grind and spend a stupid number of hours preparing until you can pattern match the broad categories. This is for both LC and system design. Then, a lot of it is luck and you may simply need to keep trying until you get in. I have a close friend who didn't prepare much, but passed an L5 interview - he didn't get any DP, graph, backtracking problems, they were just greedy/array problems which is incidentally about all he prepared for. The interviews I passed happened to also be in my strongest areas (backtracking, graphs), which was pretty lucky. Feel free to DM me (email on my profile) if you'd like.