Personally I have checked 3/4 boxes here, and actively working on a job board currently for fun...
At least for a job board, it feels like it is useful, and also ultimately not that complex a piece of software. Which is nice for doing some light coding as opposed to things I usually deal with at work.
+1 to this! I have tons of fun while building this job board and having to refactor my code multiple times to generalize a pattern that can pull jobs from various sites. It is so fun to dig into some readings on the trimodal nature of tech compensation and pay transparency laws in the US. Plus it is a helpful site for folks like you said.
What type of job board are you building btw? Does it focus on a niche?