Each practice area had a separate interview (security, db, java, network), plus there was a culture fit and manager interview. Each area went as deep as the rabbit-hole can go, but still all questions seemed to be relevant and practical. I think there is practically no person who would be able to give good answer to all, but they also accepted good thinking like "this is how I would look up more info"

Extensive multi-round technical rounds with actual team members. Nice friendly environment, but tough questions from OS, networking to hadoop components and programming. Initial and final discussions are with management and recruiters.