I applied through an employee referral. The process took 4 weeks. I interviewed at MITRE (McLean, VA)
Interview
Good experience. Had a couple phone interviews with non-HR, non-hiring personnel as a screen. Then phone with HR, followed up by a half-day on site where I made a presentation and met with a half-dozen would-be co-workers. All of them were exceptionally nice and professional.
Interview questions [1]
Question 1
Interviews were conversational, but probed for functional knowledge of modeling and statistics, and did dig into techniques and methods a bit. For a true math/stats person the Qs were probably on the easy side. If you're more of a generalist or non-technical they were more moderate. Certainly nothing especially difficult if you've gotten through the initial stages I'd guess.