Contact was initiated by HR via professional network site. Went through phone interview with a recruiter and then on-site interview with 3 people over a 2 hour period and then final phone interview with an off-site senior manager. I was informed I would receive a response via a specific timeframe. It was the last I heard from anyone. Overall interview process was positive, but it was rather unprofessional that I was told that I would be contacted again within a certain timeframe and there was no communication follow through.