GitHub Certificates have just launched in Beta and they suck. They only have options for GitHub at the moment, so whats the point. They won't make you any more credible as a developer, and employers won't care if you have one in your resumé.
Here's an example question:
> Which GitHub product includes a cloud-hosted and self-hosted deployment option?
No-one cares it's just shitty marketing. I had high hopes but they were clearly misplaced.
@freddy ... said no HR person ever!