Socialhome!
I had exactly this thought just over a month ago. After mulling it over for a few days, I decided that the only reasonable way to build it would be on top of Scuttlebutt. Alice shares her CV, makes it available via a pub, Bob shares a job description at the same pub, and the two can connect through there, etc.
The advantage of SSB is the absence of the need for an always-on, big data cloud service. The project instead is managed by a swarm of phones all connecting intermittently. It’s very solarpunk.
The big problem for me was the multiple device question. If Alice wants to interact with “FreeLinkedIn” both on her phone and her laptop sporadically over many days, you still need a cloud device to hold state, negating all the benefits granted from SSB. I couldn’t figure a way around this, and then got distracted.
Networking.
That’s a tall order and almost paradoxical in nature by default. I’m quite confident hosting your own portfolio on your own website is the closest we’ll get to this.
Have you already looked at Gitlab, codeberg, gitea or forgejo?
This is the way. I plan on creating a website to host my portfolio to potential employers. That’s a lot better than having a LinkedIn page.
Is-a.dev was a thing once too I think
Does it need to be a new piece of software though?
I’m thinking it might be a lot easier to put some effort building a professional community on Mastodon (maybe on it’s own instance) than building it from scratch as a new platform.
There might be, but the fact that you don’t know it illustrates the problem: market share and popularity.
Friendica? Linkedin is the same format as Facebook, just with a different theme.