ultimately prove to be less-than-spectacular developers
There's no sure-fire way to know exactly who you're hiring unless you know the person (and even then!).
But: many of these companies are using the wrong criteria, out of bad habit or sheer laziness. You get "brain teaser" questions ("how would you tell which light bulb had been on in the past 10 minutes?"), coding tests, even demands to know which lsof flag does foobar (but that's why God invented man pages!). In my estimation, the only real way to get inside someone's head is to get them talking about what they've worked on, hear their war stories, and talk in depth about how they've solved problems and built things.
There's no sure-fire way to know exactly who you're hiring unless you know the person (and even then!).
But: many of these companies are using the wrong criteria, out of bad habit or sheer laziness. You get "brain teaser" questions ("how would you tell which light bulb had been on in the past 10 minutes?"), coding tests, even demands to know which lsof flag does foobar (but that's why God invented man pages!). In my estimation, the only real way to get inside someone's head is to get them talking about what they've worked on, hear their war stories, and talk in depth about how they've solved problems and built things.