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      Duolingo

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      Software Engineer Interview

      Jan 28, 2026
      Anonymous Interview Candidate
      No offer
      Positive experience
      Difficult interview

      Application

      I interviewed at Duolingo

      Interview

      Was given an OA on code signal that had 4 questions. A lot of it was about graph traversal algorithm. I did not pass all of the hidden test cases for one of the questions, probably why I did not get moved to the next round.

      Interview questions [1]

      Question 1

      Graph traversal style DSA questions
      Answer question

      Other Software Engineer Interview Reviews for Duolingo

      Software Engineer Interview

      May 6, 2026
      Anonymous Interview Candidate
      New York, NY
      No offer
      Positive experience
      Difficult interview

      Application

      I interviewed at Duolingo (New York, NY)

      Interview

      It's a standard recruiter screen followed by a phone screen and then another phone screen before finally reaching an onsite. It's a long tedious process. Would not recommend for people looking for a smooth process.

      Software Engineer I Interview

      Jan 12, 2026
      Anonymous Interview Candidate
      Pittsburgh, PA
      Declined offer
      Neutral experience
      Average interview

      Application

      I applied online. I interviewed at Duolingo (Pittsburgh, PA)

      Interview

      Onsite Interview: 1. Code review round on codesignal, reviewing a pull request, comment on code quality and errors 2. Whiteboard leetcode problem, Medium level 3. Pair programming w/ Senior Engineer on a toy demo, using VS Code Codesharing

      Interview questions [1]

      Question 1

      Prep questions and ask about their job responsibilities.
      Answer question

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