Duolingo·Software Engineer

Duolingo Software Engineer interview experience

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United StatesPosted Oct 2024 · Candidate report, summarized by Dataford

My first step was a CodeSignal GCA online assessment, and I used a past score to make it through.

After that, I did a Karat-hosted interview that stretched into a longer hour. A chunk of it was quick checks and explanations—things like time and space complexity, plus small debugging-style prompts where I had to describe what the code was doing. Then the middle of the session turned into a harder implementation problem centered on hashmaps.

For the batch day final stage, I had a 60-minute technical round where I focused on writing and explaining test cases for a LeetCode-style problem before solving it, followed by follow-up questions that touched on OOP concepts. I also had a short

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