[passiveincomelg]

One company I applied at last year used hackerrank as part of the interview process. There were two tasks, neither was an "algorithm puzzle". The first was a very simple one that can be checked for correctness automatically (e.g. "remove duplicates from this list of email addresses").

The second one was basically a homework assignment, just timeboxed to 45 minutes or so ("refactor this simple frontend app"). In the following call I expected that we talk about my solution to this task, but we mostly talked about previous projects I've worked on (which was a better use of our time, IMHO).

So I guess what I'm saying is that it is possible to make good use of sites like hackerrank.