You don't personally need karma for your post to have visibility. I found your post on the hiring thread and for some reason it had been downvoted once. I upvoted it once just to counter that.

There were actually a few downvoted posts in the hiring thread, which seemed weird to me. None of them seemed to violate thread norms or otherwise be objectionable. I upvoted those too.

Dang has stated before that they are working on trying to improve the HN software so all comments show on a single page, but currently comments get paginated when there are a lot of them. That includes the current hiring discussion. You need to click the "more" link to see comments that don't fit on the first page.