And, it's also possible that they are used as plain-old "brand recognition advertisements", and no one really gets hired. Unless of course Smarking is hiring dozens of "head of engineering" positions (or turnover is that ridiculously high) [0]
[0] https://news.ycombinator.com/item?id=27294446
Edited to add: I see it as a dark pattern because it is not explicitly stated as an "Ad" or "Sponsored", and relies on us navigating somewhere else to determine if this is some kind of special post, or for us to have the experience to recognize it as something different than an organic post.
I.E. If today were your first visit to this site, would you recognize them specifically as promoted / sponsored content?