I tried to build a job board awhile back, and although there was demand in the consumer side, it ended up being a gigantic slog and a waste of time because every company is busy paying the Indeeds/Linkedins of the world. Because they get millions of more users. Unless you intend for this to be free, I don’t see how it could ever be profitable.
I ended up pivoting to just having a free daily remote jobs email for engineers (among other roles) https://bloomberry.com/blog/remote-jobs/