Not OP, 15 years of commercial experience, been writing code since 95. Only two companies did something similar to LeetCode, never prepared — last time I seriously took part in programming competitions was in high school in 2004 — still easily solved everything they asked for. One of the problems was actually famous n queens — which I remembered as a problem, but didn't remember the solution for. Solved it in 40 minutes (with an uncommon solution, as interviewer later told me) anyway.
Most of interesting questions had to do with system design and debugging, soft skills (also system design and debugging, but of systems made out of people instead of code) and code reviews — with me reviewing their production code. Sometimes I got pretty stupid interview questions like remembering REST spec (there isn't one) by heart, but those were companies I wouldn't want to work for anyway.
Most of interesting questions had to do with system design and debugging, soft skills (also system design and debugging, but of systems made out of people instead of code) and code reviews — with me reviewing their production code. Sometimes I got pretty stupid interview questions like remembering REST spec (there isn't one) by heart, but those were companies I wouldn't want to work for anyway.