Duolingo·Software Engineer

Duolingo Software Engineer interview experience

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Candidate report, summarized by Dataford

I began with a quick, one-minute self-introduction, then the interview turned into a short burst of verbal problem solving.

For about fifteen minutes I answered three quick algorithm and complexity questions without writing much code—one asked about whether it was feasible to randomly select a line from a file with equal probability, another had me analyze time and space complexity of a given function, and the last compared approaches for checking whether all elements of one sorted array appear in another.

The final part was a longer coding section, about forty-five minutes. I implemented a breadth-first search solution for a problem where a square moved diagonally across a screen, and the goal was to compute the

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