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I had one phone interview, followed by five on-site interviews.

The interviewer showed me a pattern of alphanumeric digits. He had trouble verifying my observations, so we wasted a lot of time trying to get to the actual pattern. After we agreed on the pattern, I had to write an algorithm to code numbers in this

First, you will get a call from a recruiter with simple background questions, followed by an invitation for a technical interview. Make sure you do plenty of coding challenges, including LeetCode hard questions.