Any test that: 1) is similar to the work in the day-to-day role 2) doesn't require more than a 1-2 hour time commitment from a candidate 3) is interesting

HackerRank questions typically don't meet criteria 1 or 3. The best tests are often ones that the engineering team has designed themselves.

For example, this is an example of a test that meets all the criteria above: https://app.mightyacorn.io/flow-club/founding-front-end-engi...