Comments work just fine, but the domain news.ycombinator.com is blocked by default so a user with enough karma needs to click 'vouch' first. (blocked because it's open used for tests or mistake submissions).

Wow! Didn’t know. I thought they had an hardcoded rule saying that news.ycombinator.com were job offers and rejected all comments. Does that mean you can comment on job posts as well after vouching them ?

Please don't post jobs as submissions to HN.

This is in the FAQ: https://news.ycombinator.com/newsfaq.html, which also explains what you can do instead.

ẞmart