What reputation do you need to have on Stack Overflow to receive an invite to Careers?
The site says "Stack Overflow grants new invites to users fitting certain criteria of activity on Stack Exchange sites, including reputation".
It's a secret :)
The exact criteria probably won't be announced, because we don't want people to game it. It's not a straight "greater than X reputation", but based on expertise in a tag, and your recent activity on the site.
Also, we're trickling them out slowly (rather than blasting out 25,000 invites in the first week), so if you haven't gotten an invite yet it doesn't mean you won't.
There are other ways to get an invite, too: You can request an invite at http://careers.stackoverflow.com/cv/get-one or you can make friends with somebody who is already in the system and has some invites to give out.
On Careers 2.0 it says under FAQ For Programmers
How do I get a Careers 2.0 Profile?
Careers 2.0 profiles are by invitation only. You may be invited based on your participation on Stack Overflow, or by another programmer who admires your work.
On the Stack Overflow Blog it says
1. It’s free (to job seekers)… but invite-only.
We used to charge job seekers $19 to post resumes. That was supposed to be a basic sanity filter, to make sure that everyone in our system was really looking for a job.
You didn’t like that, and we had to agree. There are better filters than money. Starting today, posting a profile on Careers 2.0 is 100% free, but you have to be invited.
Invitations come from your peers. We’ll give members a few invites to distribute to programmers they know and trust. Or, contribute to Stack Overflow (and our other sites), get voted up by a lot of smart people, and you may get an automatic invite.
By the way, if you paid in the past: thank you! Your account is free for life. But if you don’t think it was worth it, just email us for a full refund.
The site is now updated with this
To make sure we only have great programmers, Careers 2.0 profiles are invitation-only. You can earn invitations for friends and colleagues when you:
Tell us more about yourself
Try out some of the features on your profile. Get to 150 completeness, and we’ll grant you a batch of invites.