The entire process took about 1 1/2 weeks because I had an offer deadline coming up.

First, I had one 30-45 minute phone interview with an engineer.

Then I was invited on-site for 4 ~45 minute rounds:

• Round 1: Technical and relatively straightforward.
• Round 2: Technical and a bit more challenging.
• Round 3: HR Interview. If you made it this far, you passed the first two rounds.
• Round 4: Interview with a manager. Very relaxed; I got a tour of the Bloomberg terminal and any remaining questions about the company were answered.

I heard back the next day.

Definitely use Cracking the Coding Interview for this one; some of the questions were straight out of the book.

Here are the questions:

• Perform and print level order traversal of a binary tree.
• Add two numbers whose digits are stored in a linked list. For example, adding (1->2->3->4) and (4->5->6->7) is equivalent to adding 1234 + 4567.
• Print the level at which a node is in a binary tree.
• Iterative Fibonacci.