One reason you put filters is to import foreigners. I haven't seen the US side of things but in other locations I've worked, you are required to list jobs on a

One reason you put filters is to import foreigners. I haven't seen the US side of things but in other locations I've worked, you are required to list jobs on a national jobs database for a couple of weeks first and in theory to prove you couldn't find locals before hiring foreigners. The H1B system looks similar. If you already have a candidate in mind, making the JD fit their CV both repels other qualified local candidates ("it says 4.5 years of Erlang backend experience, I'll get rejected") and makes it easy for you to justify the foreign hire. There's usually someone in HR who used to work for the relevant government ministry who will tell you exactly how to word the job ad and later visa application and appeals. Note in case not obvious: I'm not advocating doing this.