I’ve never once heard of anyone being “certified in AngularJS”, and I will admit the idea of it seems kind of silly to me personally.
AngularJS is a new, somewhat evolving open-source technology, so I’m not sure who other than the Angular team would be qualified to certify you in the first place. And with 2.0 around the corner, things will change yet again.
I’ve hired angular developers, and the single best thing you could do (in my eyes) would be to build or contribute to a working open-source project of some kind and then know your stuff when we do a code review during the hiring process.
Updated “somewhat unstable” to “somewhat evolving” 😉