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I completed a quick interview over CollabEdit and was asked several basic programming questions. The interviewer was very bad at phrasing the questions and misled me to believe the flattened array needed to be in some sorted order. His solution did

First, I introduced myself, and then they gave me a top k question. The interviewee was kind and polite. It was not that hard, so you just need to control the tempo.

1. Online phone interview, 40 minutes. 2. System design for a notification system, covering database, API, and server design. 3. Code challenge: LeetCode medium level. 4. Behavioral question: Describe a challenging time and how you overcame it.