We can append the URL parameter __RecordsPerPage
to the URL to get all the jobs on one page: https://re11.ultipro.com/KIM1000/JobBoard/ListJobs.aspx?__VT=ExtCan&__RecordsPerPage=1000
And here we can make a Dataset of all the jobs:
maxrecords = 1000;
pagedata =
Import["https://re11.ultipro.com/KIM1000/JobBoard/ListJobs.aspx?__VT=ExtCan&__RecordsPerPage=" <>
ToString[maxrecords], "Data"][[1, 2]];
jobs = Dataset[AssociationThread[pagedata[[1]], #] & /@ pagedata[[2 ;;]]]

If a given page has more than 1000 records, just change maxrecords
to something like 10000.