I applied through a recruiter. The process took 1 week. I interviewed at Hortonworks (Washington, DC) in May 2016
Interview
Recruiter initial call followed by a tech screen and then an onsite presentation. Largely centered around the Hortonworks offerings (data platform, HDF, Metron). Overall best interview/recruiting process i've ever been through. Was able to meet with executive level staff and present in front of them, very cool new office in Maryland.