There are two ways to view changes on a single job — through the organization Change Log or through the job's Activity Feed.
The change log records historical data across your company. On the change log you can see modifications made to your organization on Greenhouse Recruiting, as well as the date/time of the changes and who was responsible for making them. You can filter the change log to isolate and view changes specific to permission levels, candidates, jobs, and more.
A job's activity feed records changes specific to the job. Use the activity feed to review edits made to your job, as well as the date/time of the changes and who was responsible for making them.
Change log
Note: You must be a Site Admin on Greenhouse Recruiting to access the Change Log page.
To review the organization change log for edits to a single job, click the Configure icon 
on your navigation bar, and then select Change Log.
From the Change Log page, use the All Jobs drop-down to filter by a single job.
The change log will be filtered to only show modifications made to your selected job.
If you want to export your change log to a downloadable spreadsheet, click Export to Excel from the filter panel.
Activity feed
Note: Users will need Job Admin permissions or above to access the job's activity feed.
A job's Activity Feed is under the Job Setup tab. (Jobs > choose job from list > Job Setup > Activity Feed)
The resulting activity feed for the job will show major edits to the job, including the date/time of the edits, and the user who performed the changes.
Note: Updates to custom fields are not included in the Activity Feed.