If you are not able to find all jobs on the Job index please do the following:
On the job index click All Jobs on the left side column.
Set the range filter at the top of the page to 100% by clicking on the 3 lines and make sure that the range selector bars are at opposite sides showing all jobs.
Check that you have access to the sector the job is assigned to.
Clear all filters.
Check that the job hasn't been archived (it would appear in Job Archives index instead).