Their posts are bot-generated and the jobs are fake.
Ian is our recruiter, I checked AshBy, and basically everyone's getting at least a "Sorry you're not a fit" email (save for people spamming the inbox multiple times)
As for why we've posted the same job many times. We're an early stage infrastructure company, and it's surprisingly hard to find people who go really deep (Example: We've built our own orchestrator, so we're looking for people who would build kubernetes instead of use it)