Each unit of corporation will have its own requirements, thus - processes will differ, except for common HR screening (first) and compliance (last) interview. Being gambling company PT screens off bet, drug and alcohol addicts. Now the unit, that i've been interviewed to, required single tech interview limited to tech talks with 2 guys for about an hour and a half. Questions were primarily of the nature and basics of Scala, Akka and NoSql databases. Nothing too challenging but also with a chance to show how deep you understand, what goes on behind the scene.