Here's an interesting one.

Cincinnati Bengals defensive backs coach Vance Joseph will interview with the Denver Broncos for their vacant head coaching position on Friday. NFL Insider Ian Rapoport initially tweeted the story, which was confirmed late Thursday night by Mike Klis with the Denver Post.

Joseph joined the Bengals last year as a defensive backs coach with Mark Carrier in a duel role... whereas Carrier spent more time with the safeties, Joseph coached cornerbacks like Leon Hall, Terence Newman, Adam Jones while also developing younger cornerbacks like Dre Kirkpatrick and rookie Darqueze Dennard.

According to Jason La Canfora with CBS Sports, Baltimore Ravens offensive coordinator Gary Kubiak will also talk with the Denver Broncos with an interview that's expected to happen over the weekend.

Most are expecting Kubiak to win the job if he accepts it.

Kubiak was the Broncos offensive coordinator and quarterback's coach when John Elway, the team's current president, quarterbacked the Broncos from '95-'98. And before that, Kubiak as Elway's backup quarterback from '83-91. Per most reports, if Kubiak reverses his decision to stay in Baltimore as the team's offensive coordinator, there "appears to be little question that he will become the man to beat for the Broncos job."

According to Aaron Wilson with the Baltimore Sun, the Ravens are preparing for the possibility that Kubiak will leave.

As for Joseph, the veteran defensive backs coach spent six seasons in San Francisco ('05-10) with the final five coaching defensive backs. He helped improve Houston's secondary when he joined the Texans from '11-13. Prior to his work in the NFL, Joseph played quarterback at Colorado (90-94), was a graduate assistant there (99-01) and then an assistant coach (2002-03). Home is a powerful motivator.

And as Klis points out, going from position coach to head coach isn't unheard of:

Pittsburgh’s Mike Tomlin, Baltimore’s John Harbaugh, Kansas City’s Andy Reid and San Francisco’s Jim Tomsula all got their first head coaching gigs directly from position coach.

Joseph, whom many consider a rising star in the coaching ranks, hasn't been the only Bengals coach to interview for a head coaching gig. Cincinnati Bengals offensive coordinator Hue Jackson interviewed with the Buffalo Bills last Wednesday, whom ended up hiring Rex Ryan earlier this week.