The company for which I work, Tucows, has a job opening for an Integration Engineer. Here's a very quick description of the job:
The successfulincumbentcandidate will have the challenging opportunity to work on Tucows’ vast and complex high availability system spread across multiple data centers, servers and operating systems. You’ll work with a dynamic team of Integration Engineers to develop, deploy and maintain components of a large scale hosted messaging platform. In addition, you will develop software components for our hosted messaging platform; liaise with third party suppliers in customizing applications for deployment on our high availability production environment; as well as contribute to ongoing process improvement of the SDLC.
For a full description, see this entry in the Tucows Blog.

Incumbent got started in job ads as a way to describe what the old guy did when you didn't really have a good handle on what the job should be called: "The incumbent drinks a lot of coffee and fills out TPS reports. He's retiring next month and we need to hire someone to sit in his office." Now every HR person in the world seems to think it is a synonym for "job-seeker", which is precisely, exactly, wrong.
Stop it. Please.
I'll go have a word with HR and suggest that they use the word "candidate". I'll bet that since incumbents are also candidates in elections, some people think the words are synonyms.