Each practice area had a separate interview: security, DB, Java, and network. There was also a culture fit and a manager interview.

Each area went as deep as a rabbit hole can go, but all questions still seemed relevant and practical. I think there is practically no person who could answer all questions perfectly, but they also accepted good thinking, such as "this is how I would look up more information."

1. Tell me about PKI.

What are the fields of a certificate?

1. How would you debug if the user tells that the app is slow?

Memory leak detection? DB query optimization? How do you stress-test a gigabit network link?

1. Tell me about Java memory.

GC strategies, sun.misc.Unsafe