You mean like LockedOut?

#fedihire hashtag on Mastodon is as close as it gets.

If you work in tech in Europe, lots of people are already on mastodon.

This probably won't help you, but there was Flockingbird. However its attempt to index Mastodon's job offers ended up in drama as Mastodon generally does not like being indexed...

Just use Mastodon.

It's not a Federated platform like LinkedIn, but I am working on CareerCupid , a "OkCupid for jobs" website where people can answer questions about their values and goals, and then find out people that are the most compatible to work with. The website does work with ActivityPub though, you can follow @thecupid@cupid.careers and you can see the new polls and job listings published on the website.

Search for tech coops, quite a few seem to be popping up recently. I'm not directly in tech and still haven't found who I'd really love to work for, so I can't help much, but it's a lovely question and I'm curious about other people's answers!

Nope. There is none as I'm aware off.