Duolingo·Software Engineer

Duolingo Software Engineer interview experience

No offer

Medium

Negative

Candidate report, summarized by Dataford

I went through a multi-round path that started with coding and then moved into an onsite that felt broader than the typical algorithm-only format.

First there were two coding rounds that didn’t feel especially difficult, and then I had an onsite interview that included a system design question about designing a reminder for users who hadn’t logged in for several days.

The onsite also had a coding challenge on 2D array prefix sums, and it included a backend code review round that was genuinely different from what I expected. I was asked to review a sample pull request for what it would mean for a junior engineer—focusing on giving feedback on the change. There was also an HR conversation and a casual chat that didn’t count toward

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