Google

It started with an HR interview. After the HR interview, I was scheduled for a phone screen interview with one engineer. He started by introducing himself and then posed a coding question. We were sharing a Google Doc, so he wrote the question and

I was called because they found my resume in a conference database. After a 10-minute talk, they set up an interview right away. The interviewer and recruiter were very nice and polite. Check out Programming Interviews Exposed (book) to help review.

It was hard, as you must have problem-solving skills and great, solid basics such as OOP, data structures, algorithms, and so on. One thing that may help you is the Codeforces website and LeetCode.