[clay_to_n]

At some point, you need to decide what you're going to ask something to build in an interview. It's probably been implemented before.

Yes, reversing an array is arguably lower level than an application engineer needs to go - but not by much (in some languages you will be doing this yourself). And if they can do that, they can do something comparably difficult.

[walrus1066]

Why not choose a problem more representative of the job and business domain?

One that demonstrates their ability to write clean, testable, readable OO code, with appropriate abstractions, and not overengineered.

I find most candidates, struggle to do this, including algo wizards. Most software engineers aren't good at this either.