Jobs posts can't be regular submissions, but we have monthly "Who Is Hiring" threads that are free to everyone. They appear on the first weekday of each month and can be found at https://news.ycombinator.com/submitted?id=whoishiring afterward. You post your job as a comment in the latest thread.

Please read the instructions at the top of the thread (above the actual job posts) and take a look at some of the other posts to get an idea of the conventions. These threads become closed to new comments after two weeks. Since tomorrow (Oct 1) is the first weekday of October, there will be a new thread then.

One important point is that you have to personally be part of the hiring company in order to post. Third-party recruiters and job boards aren't allowed.