It was disorganized.

Every round was technical. I went through 3 rounds (2 phone + 1 Skype).

I solved all the problems but had my application rejected at the Hiring Committee. When asked for feedback, I was refused and given a generic response. It was a slow, painful process and, at the end, no feedback was even given.

Interview 1: Asked basic algorithm questions.

Interview 2: Asked to implement a Trie.

Interview 3: How to serialize a Binary Search Tree? What special properties can you use that you can't use when serializing a normal Binary Tree? Write code to recreate the serialized Binary Search Tree?