There's a couple job posts here that have been mistakenly hellbanned (invisible to everyone except the submitter, who doesn't realize they're being blocked). These are the affected submitters: you can read their posts from last month's "Who's Hiring", they're mostly the same.
<a href="https://news.ycombinator.com/threads?id=infer" > (Infer, Inc., machine learning)
<a href="https://news.ycombinator.com/threads?id=dirtyb1t" > (Cigital, security)
(Is there any way to report this sort of thing privately?)