Here we go. There’s just no real barometer – it’s not like being a Doctor or a Lawyer where you can check the applicant’s college, GPA, and Bar Score (is that a thing?) and know the person is proficient. If you're hiring technical staff and you clearly understand what you need these people to do on a daily basis and why you need them to do it then there is absolutely no excuse for not having even a basic set of minim…
The "startup ninja hacker" world is in need of a reality check
The "tradicional hiring" methods has some glaring defects, but people don't realize it's got a lot of things right as well!
I want your resume, yes. You don't need one if your name really rings a bell like Gosling, Stroustroup, Torvalds. Not "built JQuery UI plugins" famous, sorry.
Also, it's great if you can link to a previous work, but if you can't it's ok. Projects go offline (happened to me), are sold as part of a product (yes), or are part of a really expensive product (yep).
"Sorry but if you're my employer, the onus is upon you to be familiar with international hiring policies." I lost count of how many "recruiters" contacted me offering a job in the US (residents only). But you know, in the same place you got my email there was a disclaimer "need sponsorship to work in the US". So if you ignore this, I'm gonna assume it's a poor job offer (and it usually is)