By far the most important information seemed to be location and/or remote filtering. Gaganpreet stepped up and is doing a pretty good job with https://github.com/gaganpreet/hn-hiring-mapped, but it's still not 100%.
I would really love for whoshiring to provide this pipe-delimited template, and then optionally allow posters to conform to it. I also agree with danso's order of importance, but would also like to add that the location string(s) should be something geocodable by Maps APIs (ie, feed the string in and get an unambiguous LatLng).