I was called for an onsite interview after submitting my application. The interview consisted mostly of softer technical questions, such as the difference between function overloading/overriding, and code reading. It was not really hard, just be prepared for OO programming questions. The interviewers weren't notified that I had an interview until an hour prior to my interview. There was no tour or anything, just a 1 hour interview. It was not the most friendly interview in the world.

Explain polymorphism, inheritance, etc...