See <a href="https://news.ycombinator.com/newsfaq.html" rel="nofollow">https://news.ycombinator.com/newsfaq.html</a><p>“ Another kind of job ad is reserved for YC-funded startups. These appear on the front page, but are not stories: they have no vote arrows, points, or comments. They begin part-way down and fall steadily. Only one is on the front page at a time. The rest are listed at jobs.”
It's a perk for YC companies. They can post "help wanted" ads on HN. Comments are disabled. Whether that's a good thing or not has been debated ad nauseam, but that's the way it is.