Duolingo·Software Engineer

Duolingo Software Engineer interview experience

No offer

Medium

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Candidate report, summarized by Dataford

I went through five rounds of video interviews, and the flow mixed “show your reasoning” questions with actual coding.

The first segment had coding-style prompts where I had to determine outputs of data structure behaviors like stack, heap, and queue. I typed answers in Google Docs, then moved into two 2D array questions.

One of the 2D problems had heights in each cell and asked for the longest decreasing path. After that, there was a follow-up scenario involving a character with rocket shoes that could jump from low to high; that became another longest-path style challenge. I also did pair coding over VSCode sharing, where I was given a specific feature to implement using Duolingo’s context.

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