2.) Open up your developer console in chrome (Ctrl+Shift+J command on windows), and navigate to the Network tab.
3.) Change the filter to Fetch/XHR
4.) Refresh the page
5.) You should see a few requests pop up, the one you care about is the clientRequestId request
6.) Take a look at the response payload of that request (throw it in http://jsonprettyprint.net/ for readability)
7.) You get a json payload that gives you the job positions you're looking for
8.) In addition to that, go back to the original web page and scroll down. You'll see a new request pop-up, giving you a format for how you'll traverse through the next positions.
Hope this helps!