There's are official "Who wants to be hired?" and "Freelancer? Seeking freelancer?" postings that appear at the same time as the "Who is hiring?" posting (first business day of the month). HN Guidelines forbid job ads outside these official postings. (See the "FAQ" link at the bottom of the page.)
February's postings:
https://news.ycombinator.com/item?id=13541681
https://news.ycombinator.com/item?id=13541680